diff --git a/monitoring/monitorlib/fetch/__init__.py b/monitoring/monitorlib/fetch/__init__.py
index d69a3eb321..061337a799 100644
--- a/monitoring/monitorlib/fetch/__init__.py
+++ b/monitoring/monitorlib/fetch/__init__.py
@@ -73,10 +73,14 @@ def describe_flask_request(request: flask.Request) -> RequestDescription:
         "received_at": StringBasedDateTime(datetime.datetime.utcnow()),
         "headers": headers,
     }
-    try:
-        kwargs["json"] = request.json
-    except ValueError:
-        kwargs["body"] = request.data.decode("utf-8")
+    data = request.data.decode("utf-8")
+    if request.is_json:
+        try:
+            kwargs["json"] = json.loads(data)
+        except ValueError:
+            kwargs["body"] = data
+    else:
+        kwargs["body"] = data
     return RequestDescription(**kwargs)
 
 
@@ -263,6 +267,14 @@ def status_code(self) -> int:
     def json_result(self) -> Optional[Dict]:
         return self.response.json
 
+    @property
+    def error_message(self) -> Optional[str]:
+        return (
+            self.json_result["message"]
+            if self.json_result is not None and "message" in self.json_result
+            else None
+        )
+
 
 class QueryError(RuntimeError):
     """Error encountered when interacting with a server in the UTM ecosystem."""
diff --git a/monitoring/monitorlib/geo.py b/monitoring/monitorlib/geo.py
index f568e0d0d3..b47b483bb2 100644
--- a/monitoring/monitorlib/geo.py
+++ b/monitoring/monitorlib/geo.py
@@ -7,6 +7,7 @@
 from implicitdict import ImplicitDict
 import numpy as np
 import s2sphere
+from s2sphere import LatLng
 from scipy.interpolate import RectBivariateSpline as Spline
 import shapely.geometry
 from uas_standards.astm.f3548.v21 import api as f3548v21
@@ -501,3 +502,38 @@ def egm96_geoid_offset(p: s2sphere.LatLng) -> float:
     # listed -90 to 90.  Since latitude data are symmetric, we can simply
     # convert "-90 to 90" to "90 to -90" by inverting the requested latitude.
     return _egm96.ev(-lat, lng)
+
+
+def generate_slight_overlap_area(in_points: List[LatLng]) -> List[LatLng]:
+    """
+    Takes a list of LatLng points and returns a list of LatLng points that represents
+    a polygon only slightly overlapping with the input, and that is roughly half the diameter of the input.
+
+    The returned polygon is built from the first point of the input, from which a square
+    is drawn in the direction opposite of the center of the input polygon.
+
+    """
+    overlap_corner = in_points[0]  # the spot that will have a tiny overlap
+
+    # Compute the center of mass of the input polygon
+    center = LatLng.from_degrees(
+        sum([point.lat().degrees for point in in_points]) / len(in_points),
+        sum([point.lng().degrees for point in in_points]) / len(in_points),
+    )
+
+    delta_lat = center.lat().degrees - overlap_corner.lat().degrees
+    delta_lng = center.lng().degrees - overlap_corner.lng().degrees
+
+    same_lat_point = LatLng.from_degrees(
+        overlap_corner.lat().degrees, overlap_corner.lng().degrees - delta_lng
+    )
+    same_lng_point = LatLng.from_degrees(
+        overlap_corner.lat().degrees - delta_lat, overlap_corner.lng().degrees
+    )
+
+    opposite_corner = LatLng.from_degrees(
+        overlap_corner.lat().degrees - delta_lat,
+        overlap_corner.lng().degrees - delta_lng,
+    )
+
+    return [overlap_corner, same_lat_point, opposite_corner, same_lng_point]
diff --git a/monitoring/monitorlib/geo_test.py b/monitoring/monitorlib/geo_test.py
new file mode 100644
index 0000000000..ba2b52af17
--- /dev/null
+++ b/monitoring/monitorlib/geo_test.py
@@ -0,0 +1,36 @@
+from typing import List, Tuple
+
+from s2sphere import LatLng
+
+from monitoring.monitorlib.geo import generate_slight_overlap_area
+
+
+def _points(in_points: List[Tuple[float, float]]) -> List[LatLng]:
+    return [LatLng.from_degrees(*p) for p in in_points]
+
+
+def test_generate_slight_overlap_area():
+    # Square around 0,0 of edge length 2 -> first corner at 1,1 -> expect a square with overlapping corner at 1,1
+    assert generate_slight_overlap_area(
+        _points([(1, 1), (1, -1), (-1, -1), (-1, 1)])
+    ) == _points([(1, 1), (1, 2), (2, 2), (2, 1)])
+
+    # Square with diagonal from 0,0 to 1,1 -> first corner at 1,1 -> expect a square with overlapping corner at 1,1
+    assert generate_slight_overlap_area(
+        _points([(1, 1), (0, 1), (0, 0), (1, 0)])
+    ) == _points([(1, 1), (1, 1.5), (1.5, 1.5), (1.5, 1)])
+
+    # Square with diagonal from 0,0 to -1,-1 -> first corner at -1,-1 -> expect a square with overlapping corner at -1,-1
+    assert generate_slight_overlap_area(
+        _points([(-1, -1), (0, -1), (0, 0), (-1, 0)])
+    ) == _points([(-1, -1), (-1, -1.5), (-1.5, -1.5), (-1.5, -1)])
+
+    # Square with diagonal from 0,0 to -1,1 -> first corner at -1,1 -> expect a square with overlapping corner at -1,0
+    assert generate_slight_overlap_area(
+        _points([(-1, 1), (-1, 0), (0, 0), (0, 1)])
+    ) == _points([(-1, 1), (-1, 1.5), (-1.5, 1.5), (-1.5, 1)])
+
+    # Square with diagonal from 0,0 to 1,-1 -> first corner at 1,-1 -> expect a square with overlapping corner at 1,-1
+    assert generate_slight_overlap_area(
+        _points([(1, -1), (1, 0), (0, 0), (0, -1)])
+    ) == _points([(1, -1), (1, -1.5), (1.5, -1.5), (1.5, -1)])
diff --git a/monitoring/monitorlib/infrastructure.py b/monitoring/monitorlib/infrastructure.py
index 093ef73c28..6b88b9d515 100644
--- a/monitoring/monitorlib/infrastructure.py
+++ b/monitoring/monitorlib/infrastructure.py
@@ -3,7 +3,7 @@
 import functools
 from typing import Dict, List, Optional
 import urllib.parse
-from aiohttp import ClientSession
+from aiohttp import ClientSession, ClientResponse
 
 import jwt
 import requests
@@ -190,32 +190,52 @@ def adjust_request_kwargs(self, url, method, kwargs):
         return kwargs
 
     async def put(self, url, **kwargs):
+        """Returns (status, headers, json)"""
         url = self._prefix_url + url
         if "auth" not in kwargs:
             kwargs = self.adjust_request_kwargs(url, "PUT", kwargs)
         async with self._client.put(url, **kwargs) as response:
-            return response.status, await response.json()
+            return (
+                response.status,
+                {k: v for k, v in response.headers.items()},
+                await response.json(),
+            )
 
     async def get(self, url, **kwargs):
+        """Returns (status, headers, json)"""
         url = self._prefix_url + url
         if "auth" not in kwargs:
             kwargs = self.adjust_request_kwargs(url, "GET", kwargs)
         async with self._client.get(url, **kwargs) as response:
-            return response.status, await response.json()
+            return (
+                response.status,
+                {k: v for k, v in response.headers.items()},
+                await response.json(),
+            )
 
     async def post(self, url, **kwargs):
+        """Returns (status, headers, json)"""
         url = self._prefix_url + url
         if "auth" not in kwargs:
             kwargs = self.adjust_request_kwargs(url, "POST", kwargs)
         async with self._client.post(url, **kwargs) as response:
-            return response.status, await response.json()
+            return (
+                response.status,
+                {k: v for k, v in response.headers.items()},
+                await response.json(),
+            )
 
     async def delete(self, url, **kwargs):
+        """Returns (status, headers, json)"""
         url = self._prefix_url + url
         if "auth" not in kwargs:
             kwargs = self.adjust_request_kwargs(url, "DELETE", kwargs)
         async with self._client.delete(url, **kwargs) as response:
-            return response.status, await response.json()
+            return (
+                response.status,
+                {k: v for k, v in response.headers.items()},
+                await response.json(),
+            )
 
 
 def default_scopes(scopes: List[str]):
diff --git a/monitoring/prober/infrastructure.py b/monitoring/prober/infrastructure.py
index 5a5f145965..d0124b10c6 100644
--- a/monitoring/prober/infrastructure.py
+++ b/monitoring/prober/infrastructure.py
@@ -100,7 +100,7 @@ def wrapper_default_scope(*args, **kwargs):
 resource_type_code_descriptions: Dict[ResourceType, str] = {}
 
 
-# Next code: 373
+# Next code: 374
 def register_resource_type(code: int, description: str) -> ResourceType:
     """Register that the specified code refers to the described resource.
 
diff --git a/monitoring/prober/rid/v1/test_isa_simple_heavy_traffic_concurrent.py b/monitoring/prober/rid/v1/test_isa_simple_heavy_traffic_concurrent.py
index d22d26b07e..b85e59cae9 100644
--- a/monitoring/prober/rid/v1/test_isa_simple_heavy_traffic_concurrent.py
+++ b/monitoring/prober/rid/v1/test_isa_simple_heavy_traffic_concurrent.py
@@ -107,8 +107,8 @@ def test_create_isa_concurrent(ids, session_ridv1_async):
         )
     )
     for isa_id, resp in results:
-        assert resp[0] == 200, resp[1]
-        data = resp[1]
+        assert resp[0] == 200, resp[2]
+        data = resp[2]
         assert data["service_area"]["id"] == isa_id
         assert data["service_area"]["flights_url"] == "https://example.com/dss"
         assert_datetimes_are_equal(
@@ -133,9 +133,9 @@ def test_get_isa_by_ids_concurrent(ids, session_ridv1_async):
         )
     )
     for isa_id, resp in results:
-        assert resp[0] == 200, resp[1]
+        assert resp[0] == 200, resp[2]
 
-        data = resp[1]
+        data = resp[2]
         assert data["service_area"]["id"] == isa_id
         assert data["service_area"]["flights_url"] == FLIGHTS_URL
 
@@ -162,8 +162,8 @@ def test_delete_isa_concurrent(ids, session_ridv1_async):
     )
 
     for isa_id, resp in results:
-        assert resp[0] == 200, resp[1]
-        version = resp[1]["service_area"]["version"]
+        assert resp[0] == 200, resp[2]
+        version = resp[2]["service_area"]["version"]
         version_map[isa_id] = version
 
     # Delete ISAs concurrently
@@ -178,4 +178,4 @@ def test_delete_isa_concurrent(ids, session_ridv1_async):
     )
 
     for isa_id, resp in results:
-        assert resp[0], resp[1]
+        assert resp[0], resp[2]
diff --git a/monitoring/prober/scd/test_operation_simple_heavy_traffic_concurrent.py b/monitoring/prober/scd/test_operation_simple_heavy_traffic_concurrent.py
index 8a9d8d21e0..a885e7469a 100644
--- a/monitoring/prober/scd/test_operation_simple_heavy_traffic_concurrent.py
+++ b/monitoring/prober/scd/test_operation_simple_heavy_traffic_concurrent.py
@@ -258,7 +258,7 @@ def test_create_ops_concurrent(ids, scd_api, scd_session_async):
         op_id = req_map[0]
         op_resp_map[op_id] = {}
         op_resp_map[op_id]["status_code"] = resp[0][0]
-        op_resp_map[op_id]["content"] = resp[0][1]
+        op_resp_map[op_id]["content"] = resp[0][2]
     for op_id, resp in op_resp_map.items():
         if resp["status_code"] != 201:
             try:
@@ -342,7 +342,7 @@ def test_get_ops_by_ids_concurrent(ids, scd_api, scd_session_async):
     for op_id, resp in zip(map(ids, OP_TYPES), results):
         op_resp_map[op_id] = {}
         op_resp_map[op_id]["status_code"] = resp[0]
-        op_resp_map[op_id]["content"] = resp[1]
+        op_resp_map[op_id]["content"] = resp[2]
 
     for op_id, resp in op_resp_map.items():
         assert resp["status_code"] == 200, resp["content"]
@@ -381,7 +381,7 @@ def test_get_ops_by_search_concurrent(ids, scd_api, scd_session_async):
     for idx, resp in zip(range(len(OP_TYPES)), results):
         op_resp_map[idx] = {}
         op_resp_map[idx]["status_code"] = resp[0]
-        op_resp_map[idx]["content"] = resp[1]
+        op_resp_map[idx]["content"] = resp[2]
 
     for idx, resp in op_resp_map.items():
         assert resp["status_code"] == 200, resp["content"]
@@ -431,7 +431,7 @@ def test_mutate_ops_concurrent(ids, scd_api, scd_session, scd_session_async):
         op_id = req_map[0]
         op_resp_map[op_id] = {}
         op_resp_map[op_id]["status_code"] = resp[0][0]
-        op_resp_map[op_id]["content"] = resp[0][1]
+        op_resp_map[op_id]["content"] = resp[0][2]
 
     ovn_map.clear()
 
@@ -486,7 +486,7 @@ def test_delete_op_concurrent(ids, scd_api, scd_session_async):
     for op_id, resp in zip(map(ids, OP_TYPES), results):
         op_resp_map[op_id] = {}
         op_resp_map[op_id]["status_code"] = resp[0]
-        op_resp_map[op_id]["content"] = resp[1]
+        op_resp_map[op_id]["content"] = resp[2]
 
     assert len(op_resp_map) == len(OP_TYPES)
 
diff --git a/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py b/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py
index 2f9f3699c6..9c059217c2 100644
--- a/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py
+++ b/monitoring/uss_qualifier/resources/astm/f3548/v21/dss.py
@@ -1,12 +1,13 @@
 from __future__ import annotations
+import uuid
 from typing import Tuple, List, Dict, Optional
+
 from urllib.parse import urlparse
-from loguru import logger
 from implicitdict import ImplicitDict
 
 from monitoring.monitorlib import infrastructure, fetch
 from monitoring.monitorlib.fetch import QueryType
-from monitoring.monitorlib.scd import SCOPE_SC
+from monitoring.monitorlib.scd import SCOPE_SC, SCOPE_AA
 from monitoring.uss_qualifier.resources.resource import Resource
 from monitoring.uss_qualifier.resources.communications import AuthAdapterResource
 from uas_standards.astm.f3548.v21.api import (
@@ -16,6 +17,16 @@
     QueryOperationalIntentReferenceResponse,
     OperationalIntent,
     GetOperationalIntentDetailsResponse,
+    PutOperationalIntentReferenceParameters,
+    EntityOVN,
+    OperationalIntentState,
+    ImplicitSubscriptionParameters,
+    UssBaseURL,
+    ChangeOperationalIntentReferenceResponse,
+    SubscriberToNotify,
+    SetUssAvailabilityStatusParameters,
+    UssAvailabilityState,
+    UssAvailabilityStatusResponse,
 )
 
 
@@ -123,6 +134,117 @@ def get_full_op_intent_without_validation(
 
         return result, query
 
+    def put_op_intent(
+        self,
+        extents: List[Volume4D],
+        key: List[EntityOVN],
+        state: OperationalIntentState,
+        base_url: UssBaseURL,
+        id: Optional[str] = None,
+        ovn: Optional[str] = None,
+    ) -> Tuple[
+        Optional[OperationalIntentReference],
+        Optional[List[SubscriberToNotify]],
+        fetch.Query,
+    ]:
+        if id is None:
+            url = f"/dss/v1/operational_intent_references/{str(uuid.uuid4())}"
+            query_type = QueryType.F3548v21DSSCreateOperationalIntentReference
+        else:
+            url = f"/dss/v1/operational_intent_references/{id}/{ovn}"
+            query_type = QueryType.F3548v21DSSUpdateOperationalIntentReference
+
+        req = PutOperationalIntentReferenceParameters(
+            extents=extents,
+            key=key,
+            state=state,
+            uss_base_url=base_url,
+            new_subscription=ImplicitSubscriptionParameters(uss_base_url=base_url),
+        )
+        query = fetch.query_and_describe(
+            self.client,
+            "PUT",
+            url,
+            query_type,
+            self.participant_id,
+            scope=SCOPE_SC,
+            json=req,
+        )
+        if query.status_code != 200 and query.status_code != 201:
+            return None, None, query
+        else:
+            result = ChangeOperationalIntentReferenceResponse(
+                ImplicitDict.parse(
+                    query.response.json, ChangeOperationalIntentReferenceResponse
+                )
+            )
+            return result.operational_intent_reference, result.subscribers, query
+
+    def delete_op_intent(
+        self,
+        id: str,
+        ovn: str,
+    ) -> Tuple[
+        Optional[OperationalIntentReference],
+        Optional[List[SubscriberToNotify]],
+        fetch.Query,
+    ]:
+        query = fetch.query_and_describe(
+            self.client,
+            "DELETE",
+            f"/dss/v1/operational_intent_references/{id}/{ovn}",
+            QueryType.F3548v21DSSDeleteOperationalIntentReference,
+            self.participant_id,
+            scope=SCOPE_SC,
+        )
+        if query.status_code != 200:
+            return None, None, query
+        else:
+            result = ChangeOperationalIntentReferenceResponse(
+                ImplicitDict.parse(
+                    query.response.json, ChangeOperationalIntentReferenceResponse
+                )
+            )
+            return result.operational_intent_reference, result.subscribers, query
+
+    def set_uss_availability(
+        self,
+        uss_id: str,
+        available: bool,
+        version: str = "",
+    ) -> Tuple[Optional[str], fetch.Query]:
+        """
+        Returns:
+            A tuple composed of
+            1) the new version of the USS availability, or None if the query failed;
+            2) the query.
+        """
+        if available:
+            availability = UssAvailabilityState.Normal
+        else:
+            availability = UssAvailabilityState.Down
+
+        req = SetUssAvailabilityStatusParameters(
+            old_version=version,
+            availability=availability,
+        )
+        query = fetch.query_and_describe(
+            self.client,
+            "PUT",
+            f"/dss/v1/uss_availability/{uss_id}",
+            QueryType.F3548v21DSSSetUssAvailability,
+            self.participant_id,
+            scope=SCOPE_AA,
+            json=req,
+        )
+        if query.status_code != 200:
+            return None, query
+        else:
+            result = UssAvailabilityStatusResponse(
+                ImplicitDict.parse(query.response.json, UssAvailabilityStatusResponse)
+            )
+            return result.version, query
+
     def is_same_as(self, other: DSSInstance) -> bool:
         return (
             self.participant_id == other.participant_id
diff --git a/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/isa_subscription_interactions.py b/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/isa_subscription_interactions.py
index 741d57982f..f93923ee1d 100644
--- a/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/isa_subscription_interactions.py
+++ b/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/isa_subscription_interactions.py
@@ -2,6 +2,7 @@
 
 import arrow
 
+from monitoring.monitorlib import geo
 from monitoring.prober.infrastructure import register_resource_type
 from monitoring.uss_qualifier.common_data_definitions import Severity
 from monitoring.uss_qualifier.resources.astm.f3411.dss import DSSInstanceResource
@@ -17,6 +18,7 @@ class ISASubscriptionInteractions(GenericTestScenario):
     """Based on the test_subscription_isa_interactions.py from the legacy prober tool."""
 
     ISA_TYPE = register_resource_type(370, "ISA")
+    SUB_TYPE = register_resource_type(373, "Subscription")
 
     def __init__(
         self,
@@ -32,9 +34,10 @@ def __init__(
         self._isa_id = id_generator.id_factory.make_id(
             ISASubscriptionInteractions.ISA_TYPE
         )
-        # sub id is isa_id with last character replaced with '1'
-        # (the generated isa_id ends with a few '0's)
-        self._sub_id = self._isa_id[:-1] + "1"
+        self._sub_id = id_generator.id_factory.make_id(
+            ISASubscriptionInteractions.SUB_TYPE
+        )
+
         self._isa_version: Optional[str] = None
         self._isa = isa.specification
 
@@ -42,6 +45,25 @@ def __init__(
         self._isa_start_time = self._isa.shifted_time_start(now)
         self._isa_end_time = self._isa.shifted_time_end(now)
         self._isa_area = [vertex.as_s2sphere() for vertex in self._isa.footprint]
+        self._slight_overlap_area = geo.generate_slight_overlap_area(self._isa_area)
+
+        self._isa_params = dict(
+            area_vertices=self._isa_area,
+            alt_lo=self._isa.altitude_min,
+            alt_hi=self._isa.altitude_max,
+            start_time=self._isa_start_time,
+            end_time=self._isa_end_time,
+            uss_base_url=self._isa.base_url,
+            isa_id=self._isa_id,
+        )
+        self._sub_params = dict(
+            alt_lo=self._isa.altitude_min,
+            alt_hi=self._isa.altitude_max,
+            start_time=self._isa_start_time,
+            end_time=self._isa_end_time,
+            uss_base_url=self._isa.base_url,
+            sub_id=self._sub_id,
+        )
 
     def run(self, context: ExecutionContext):
         self.begin_test_scenario(context)
@@ -49,15 +71,32 @@ def run(self, context: ExecutionContext):
         self._setup_case()
 
         self.begin_test_case("ISA Subscription Interactions")
-        self.begin_test_step("ISA Subscription Interactions")
 
-        self._check_subscription_behaviors()
+        self.begin_test_step("New Subscription within ISA")
+        self._new_subscription_in_isa_step()
+        self.end_test_step()
 
+        self.begin_test_step("New subscription within ISA is mutated to ISA boundary")
+        self._mutate_subscription_towards_isa_boundary_step()
         self.end_test_step()
+
+        # TODO extend with steps that:
+        #  - create a subscription that barely touches the ISA
+        #  - create a subscription outside of the ISA and then mutate to:
+        #    - move the subscription into the ISA
+        #    - move the subscription such that it barely touches the ISA
+        #  - create a subscription within the ISA and then mutate to:
+        #    - move the subscription entirely outside of the ISA
+        #  - mutate the ISA so entirely outside of the subscription
+        #  - mutate the ISA to the subscription boundary
+        #
+        # Consider doing the above with and without separate Subscription IDs to increase the chances
+        # of revealing implementation bugs
+
         self.end_test_case()
         self.end_test_scenario()
 
-    def _check_subscription_behaviors(self):
+    def _new_subscription_in_isa_step(self):
         """
         - Create an ISA.
         - Create a subscription, response should include the pre-existing ISA and have a notification_index of 0.
@@ -71,14 +110,8 @@ def _check_subscription_behaviors(self):
             created_isa = self._dss_wrapper.put_isa_expect_response_code(
                 check=check,
                 expected_error_codes={200},
-                area_vertices=self._isa_area,
-                alt_lo=self._isa.altitude_min,
-                alt_hi=self._isa.altitude_max,
-                start_time=self._isa_start_time,
-                end_time=self._isa_end_time,
-                uss_base_url=self._isa.base_url,
-                isa_id=self._isa_id,
                 isa_version=None,
+                **self._isa_params,
             )
 
         # Create a subscription
@@ -88,13 +121,8 @@ def _check_subscription_behaviors(self):
             created_subscription = self._dss_wrapper.put_sub(
                 check=check,
                 area_vertices=self._isa_area,
-                alt_lo=self._isa.altitude_min,
-                alt_hi=self._isa.altitude_max,
-                start_time=self._isa_start_time,
-                end_time=self._isa_end_time,
-                uss_base_url=self._isa.base_url,
-                sub_id=self._sub_id,
                 sub_version=None,
+                **self._sub_params,
             )
 
         # Check the subscription
@@ -134,17 +162,13 @@ def _check_subscription_behaviors(self):
             "Mutate the ISA",
             [self._dss.participant_id],
         ) as check:
+            isa_mutation_params = self._isa_params.copy()
+            isa_mutation_params["alt_hi"] -= 1  # reduce max altitude by one meter
             mutated_isa = self._dss_wrapper.put_isa_expect_response_code(
                 check=check,
                 expected_error_codes={200},
-                area_vertices=self._isa_area,
-                alt_lo=self._isa.altitude_min,
-                alt_hi=self._isa.altitude_max - 1,  # reduce max altitude by one meter
-                start_time=self._isa_start_time,
-                end_time=self._isa_end_time,
-                uss_base_url=self._isa.base_url,
-                isa_id=self._isa_id,
                 isa_version=created_isa.dss_query.isa.version,
+                **isa_mutation_params,
             )
 
         # Check that the subscription ID is returned in the response
@@ -278,6 +302,225 @@ def _check_subscription_behaviors(self):
                 sub_version=created_subscription.subscription.version,
             )
 
+    def _mutate_subscription_towards_isa_boundary_step(self):
+        """
+        - Create an ISA.
+        - Create a subscription with the ISA's area, response should include the pre-existing ISA
+          and have a notification_index of 0.
+        - Modify the subscription such that its area has a very small overlap with the ISA
+        - Modify the ISA, response should include the subscription with an incremented notification_index.
+        - Delete the ISA, response should include the subscription with an incremented notification_index.
+        - Delete the subscription.
+        """
+
+        # Create an ISA
+        with self.check("Create an ISA", [self._dss.participant_id]) as check:
+            created_isa = self._dss_wrapper.put_isa_expect_response_code(
+                check=check,
+                expected_error_codes={200},
+                isa_version=None,
+                **self._isa_params,
+            )
+
+        # Create a subscription on the ISA boundary
+        with self.check(
+            "Create a subscription within the ISA footprint", [self._dss.participant_id]
+        ) as check:
+            created_subscription = self._dss_wrapper.put_sub(
+                check=check,
+                area_vertices=self._isa_area,
+                **self._sub_params,
+            )
+
+        # Mutate the subscription towards the ISA boundary
+        with self.check(
+            "Mutate the subscription towards the ISA boundary",
+            [self._dss.participant_id],
+        ) as check:
+            mutated_subscription = self._dss_wrapper.put_sub(
+                check=check,
+                area_vertices=self._slight_overlap_area,
+                sub_version=created_subscription.subscription.version,
+                **self._sub_params,
+            )
+
+        # Check the subscription
+        with self.check(
+            "Subscription for the ISA's area mentions the ISA",
+            [self._dss.participant_id],
+        ) as check:
+            if self._isa_id not in [isa.id for isa in mutated_subscription.isas]:
+                check.record_failed(
+                    summary="Subscription response does not include the freshly created ISA",
+                    severity=Severity.High,
+                    participants=[self._dss.participant_id],
+                    details=f"The subscription created for the area {self._isa_area} is expected to contain the ISA created for this same area. The returned subscription did not mention it.",
+                    query_timestamps=[
+                        created_isa.dss_query.query.request.timestamp,
+                        created_subscription.query.request.timestamp,
+                    ],
+                )
+
+        with self.check(
+            "Mutated subscription has a notification_index of 0",
+            [self._dss.participant_id],
+        ) as check:
+            if created_subscription.subscription.notification_index != 0:
+                check.record_failed(
+                    summary="Subscription notification_index is not 0",
+                    severity=Severity.High,
+                    participants=[self._dss.participant_id],
+                    details=f"The subscription created for the area {self._isa_area} is expected to have a notification_index of 0. The returned subscription has a notification_index of {created_subscription.subscription.notification_index}.",
+                    query_timestamps=[created_subscription.query.request.timestamp],
+                )
+
+        # Modify the ISA
+        with self.check(
+            "Mutate the ISA",
+            [self._dss.participant_id],
+        ) as check:
+            mutation_params = self._isa_params.copy()
+            mutation_params["alt_hi"] -= 1  # reduce max altitude by one meter
+            mutated_isa = self._dss_wrapper.put_isa_expect_response_code(
+                check=check,
+                expected_error_codes={200},
+                isa_version=created_isa.dss_query.isa.version,
+                **mutation_params,
+            )
+
+        # Check that the subscription ID is returned in the response
+        with self.check(
+            "Response to the mutation of the ISA contains subscription ID",
+            [self._dss.participant_id],
+        ) as check:
+
+            subs_to_mutated_isa = {}
+            for returned_subscriber in mutated_isa.dss_query.subscribers:
+                for sub_in_subscriber in returned_subscriber.raw.subscriptions:
+                    subs_to_mutated_isa[
+                        sub_in_subscriber.subscription_id
+                    ] = sub_in_subscriber
+
+            if created_subscription.subscription.id not in subs_to_mutated_isa.keys():
+                check.record_failed(
+                    summary="ISA mutation response does not contain expected subscription ID",
+                    severity=Severity.High,
+                    participants=[self._dss.participant_id],
+                    details="Mutating an ISA to which a subscription was made and then subsequently moved to the ISA's boundary,"
+                    " the DSS failed to return the subscription ID in the response.",
+                    query_timestamps=[
+                        created_isa.dss_query.query.request.timestamp,
+                        created_subscription.query.request.timestamp,
+                        mutated_subscription.query.request.timestamp,
+                        mutated_isa.dss_query.query.request.timestamp,
+                    ],
+                )
+
+        # Check that the subscription index has been incremented by least by 1
+        sub_to_mutated_isa = subs_to_mutated_isa.get(
+            created_subscription.subscription.id
+        )
+        if sub_to_mutated_isa is not None:
+            with self.check(
+                "Subscription to an ISA has its notification index incremented after mutation",
+                [self._dss.participant_id],
+            ) as check:
+                if sub_to_mutated_isa.notification_index <= 0:
+                    check.record_failed(
+                        summary="Subscription notification_index has not been increased",
+                        severity=Severity.High,
+                        participants=[self._dss.participant_id],
+                        details=f"The subscription created for the area {self._isa_area} is expected to have a notification_index of 1 or more. The returned subscription has a notification_index of {subs_to_mutated_isa[created_subscription.subscription.id].notification_index}.",
+                        query_timestamps=[created_subscription.query.request.timestamp],
+                    )
+
+        # Delete the ISA
+        with self.check(
+            "Delete the ISA",
+            [self._dss.participant_id],
+        ) as check:
+            deleted_isa = self._dss_wrapper.del_isa_expect_response_code(
+                main_check=check,
+                expected_error_codes={200},
+                isa_id=mutated_isa.dss_query.isa.id,
+                isa_version=mutated_isa.dss_query.isa.version,
+            )
+
+        # Check response to deletion of ISA
+        with self.check(
+            "Response to the deletion of the ISA contains subscription ID",
+            [self._dss.participant_id],
+        ) as check:
+
+            subs_to_deleted_isa = {}
+            for returned_subscriber in deleted_isa.dss_query.subscribers:
+                for sub_in_subscriber in returned_subscriber.raw.subscriptions:
+                    subs_to_deleted_isa[
+                        sub_in_subscriber.subscription_id
+                    ] = sub_in_subscriber
+
+            if created_subscription.subscription.id not in subs_to_deleted_isa:
+                check.record_failed(
+                    summary="ISA deletion response does not contain expected subscription ID",
+                    severity=Severity.High,
+                    participants=[self._dss.participant_id],
+                    details="Deleting an ISA to which a subscription was made, the DSS failed to return the subscription ID in the response.",
+                    query_timestamps=[
+                        created_isa.dss_query.query.request.timestamp,
+                        created_subscription.query.request.timestamp,
+                        deleted_isa.dss_query.query.request.timestamp,
+                    ],
+                )
+
+        for subscriber_url, notification in deleted_isa.notifications.items():
+            # For checking the notifications, we ignore the request we made for the subscription that we created.
+            if self._isa.base_url not in subscriber_url:
+                pid = (
+                    notification.query.participant_id
+                    if "participant_id" in notification.query
+                    else None
+                )
+                with self.check("Notified subscriber", [pid] if pid else []) as check:
+                    if not notification.success:
+                        check.record_failed(
+                            "Could not notify ISA subscriber",
+                            Severity.Medium,
+                            f"Attempting to notify subscriber for ISA {self._isa_id} at {subscriber_url} resulted in {notification.status_code}",
+                            query_timestamps=[notification.query.request.timestamp],
+                        )
+
+        subs_after_deletion = subs_to_deleted_isa.get(
+            created_subscription.subscription.id
+        )
+        if subs_after_deletion is not None:
+            with self.check(
+                "Subscription to an ISA has its notification index incremented after deletion",
+                [self._dss.participant_id],
+            ) as check:
+                if (
+                    subs_after_deletion.notification_index
+                    <= sub_to_mutated_isa.notification_index
+                ):
+                    check.record_failed(
+                        summary="Subscription notification_index has not been incremented",
+                        severity=Severity.High,
+                        participants=[self._dss.participant_id],
+                        details=f"The subscription created for the area {self._isa_area} is expected to have its notification increased after the subscription was deleted."
+                        f"The returned subscription has a notification_index of {subs_after_deletion.notification_index}, whilte the previous notification_index for that subscription was {sub_to_mutated_isa.notification_index}",
+                        query_timestamps=[created_subscription.query.request.timestamp],
+                    )
+
+        # Delete the subscription
+        with self.check(
+            "Subscription can be deleted",
+            [self._dss.participant_id],
+        ) as check:
+            self._dss_wrapper.del_sub(
+                check=check,
+                sub_id=self._sub_id,
+                sub_version=mutated_subscription.subscription.version,
+            )
+
     def _setup_case(self):
         self.begin_test_case("Setup")
 
@@ -305,6 +548,9 @@ def _delete_isa_if_exists(self):
 
     def _clean_any_sub(self):
         self._dss_wrapper.cleanup_subs_in_area(self._isa_area)
+        # Explicitly clean up in the separate area in case the DSS does
+        # not return that subscription when searching in the ISA's footpring
+        self._dss_wrapper.cleanup_subs_in_area(self._slight_overlap_area)
 
     def cleanup(self):
         self.begin_cleanup()
diff --git a/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/utils.py b/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/utils.py
index 036876ed93..54e20a6655 100644
--- a/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/utils.py
+++ b/monitoring/uss_qualifier/scenarios/astm/netrid/common/dss/utils.py
@@ -1,5 +1,7 @@
 from typing import Optional
 
+from s2sphere import LatLng
+
 from monitoring.monitorlib.fetch import rid as fetch
 from monitoring.monitorlib.infrastructure import UTMClientSession
 from monitoring.monitorlib.mutate import rid as mutate
diff --git a/monitoring/uss_qualifier/scenarios/astm/netrid/dss_wrapper.py b/monitoring/uss_qualifier/scenarios/astm/netrid/dss_wrapper.py
index f1f1fb2de5..bbc277b0ca 100644
--- a/monitoring/uss_qualifier/scenarios/astm/netrid/dss_wrapper.py
+++ b/monitoring/uss_qualifier/scenarios/astm/netrid/dss_wrapper.py
@@ -303,6 +303,9 @@ def put_isa_expect_response_code(
             participant_id=self._dss.participant_id,
         )
 
+        for notification_query in mutated_isa.notifications.values():
+            self._scenario.record_query(notification_query.query)
+
         self.handle_query_result(
             check=check,
             q=mutated_isa.dss_query,
diff --git a/monitoring/uss_qualifier/scenarios/astm/netrid/v19/dss/isa_subscription_interactions.md b/monitoring/uss_qualifier/scenarios/astm/netrid/v19/dss/isa_subscription_interactions.md
index 6b66615868..9fcbb82edf 100644
--- a/monitoring/uss_qualifier/scenarios/astm/netrid/v19/dss/isa_subscription_interactions.md
+++ b/monitoring/uss_qualifier/scenarios/astm/netrid/v19/dss/isa_subscription_interactions.md
@@ -51,7 +51,7 @@ When a pre-existing ISA needs to be deleted to ensure a clean workspace, any sub
 This test case will do the following, using the DSS being tested:
 
 1. Create an ISA with the configured footprint,
-2. Create a subscription for the ISA's area, and expect:
+2. Do several variants of creating and possibly mutating a subscription, either in or close to the ISA's area, and expect:
    - to find the created ISA mentioned in the reply
    - the notification index of the subscription to be 0
 3. Modify the ISA, and expect:
@@ -62,7 +62,10 @@ This test case will do the following, using the DSS being tested:
    - the notification index of the subscription to be greater than it was after the mutation
 5. Delete the subscription.
 
-### ISA Subscription Interactions test step
+### New Subscription within ISA test step
+
+This test step checks for interactions between ISAs and a subscription that is created within the ISA, then
+subsequently mutated to only barely intersect with the ISA.
 
 #### Create an ISA check
 
@@ -122,6 +125,78 @@ Failure to do so means that the DSS is not properly implementing **[astm.f3411.v
 
 Notifications to any subscriber to the created ISA need to be successful.  If a notification cannot be delivered, then the **[astm.f3411.v19.NET0730](../../../../../requirements/astm/f3411/v19.md)** requirement to implement the POST ISAs endpoint isn't met.
 
+### New subscription within ISA is mutated to ISA boundary test step
+
+This test step checks for interactions between ISAs and a subscription that is created within the ISA and the mutated
+to only barely overlap with the ISA.
+
+#### Create an ISA check
+
+If the ISA cannot be created, the PUT DSS endpoint in **[astm.f3411.v19.DSS0030,a](../../../../../requirements/astm/f3411/v19.md)** is likely not implemented correctly.
+
+#### Create a subscription within the ISA footprint check
+
+The DSS should allow the creation of a subscription within the ISA footprint, otherwise it is in violation of **[astm.f3411.v19.DSS0030,c](../../../../../requirements/astm/f3411/v19.md)**
+
+#### Mutate the subscription towards the ISA boundary check
+
+The DSS should allow a valid mutation of a subscription's area, otherwise it is in violation of **[astm.f3411.v19.DSS0030,c](../../../../../requirements/astm/f3411/v19.md)**
+
+#### Subscription for the ISA's area mentions the ISA check
+
+A subscription that is created for a volume that intersects with the previously created ISA should mention
+the previously created ISA. If not, the serving DSS is in violation of **[astm.f3411.v19.DSS0030,c](../../../../../requirements/astm/f3411/v19.md)**.
+
+#### Mutated subscription has a notification_index of 0 check
+
+A newly created subscription is expected to have a notification index of 0, otherwise the DSS implementation under
+test does not comply with **[astm.f3411.v19.DSS0030,c](../../../../../requirements/astm/f3411/v19.md)**
+
+#### Mutate the ISA check
+
+If the ISA cannot be mutated, **[astm.f3411.v19.DSS0030,a](../../../../../requirements/astm/f3411/v19.md)** is likely not implemented correctly.
+
+#### Response to the mutation of the ISA contains subscription ID check
+
+When an ISA is mutated, the DSS must return the identifiers for any subscription that was made to the ISA,
+or be in violation of **[astm.f3411.v19.DSS0030,a](../../../../../requirements/astm/f3411/v19.md)**.
+
+#### Subscription to an ISA has its notification index incremented after mutation check
+
+When an ISA is mutated, the DSS must increment the notification index of any subscription to that ISA,
+and return the up-to-date subscription in the response to the query mutating the ISA.
+
+Failure to do so means that the DSS is not properly implementing **[astm.f3411.v19.DSS0030,a](../../../../../requirements/astm/f3411/v19.md)**.
+
+#### Subscription that only barely overlaps the ISA contains the ISA check
+
+A subscription that is created for a volume that only barely overlaps with the previously created ISA should still
+contain the ISA in the reply from the server, otherwise the DSS does not comply with **[astm.f3411.v19.DSS0030,c](../../../../../requirements/astm/f3411/v19.md)**
+
+#### Delete the ISA check
+
+If that ISA cannot be deleted, the **[astm.f3411.v19.DSS0030,d](../../../../../requirements/astm/f3411/v19.md)** requirement to implement the ISA deletion endpoint might not be met.
+
+#### Response to the deletion of the ISA contains subscription ID check
+
+When an ISA is deleted, the DSS must return the identifiers for any subscription that was made to the ISA,
+or be in violation of **[astm.f3411.v19.DSS0030,b](../../../../../requirements/astm/f3411/v19.md)**.
+
+#### Subscription to an ISA has its notification index incremented after deletion check
+
+When an ISA is deleted, the DSS must increment the notification index of any subscription to that ISA,
+and return the up-to-date subscription in the response to the query deleting the ISA.
+
+Failure to do so means that the DSS is not properly implementing **[astm.f3411.v19.DSS0030,a](../../../../../requirements/astm/f3411/v19.md)**.
+
+#### Subscription can be deleted check
+
+**[astm.f3411.v19.DSS0030,d](../../../../../requirements/astm/f3411/v19.md)** requires the implementation of the DSS endpoint to allow callers to delete subscriptions they created.
+
+#### Notified subscriber check
+
+Notifications to any subscriber to the created ISA need to be successful.  If a notification cannot be delivered, then the **[astm.f3411.v19.NET0730](../../../../../requirements/astm/f3411/v19.md)** requirement to implement the POST ISAs endpoint isn't met.
+
 ## Cleanup
 
 The cleanup phase of this test scenario attempts to remove the ISA if the test ended prematurely while
diff --git a/monitoring/uss_qualifier/scenarios/astm/netrid/v22a/dss/isa_subscription_interactions.md b/monitoring/uss_qualifier/scenarios/astm/netrid/v22a/dss/isa_subscription_interactions.md
index 526545c24a..8e78991083 100644
--- a/monitoring/uss_qualifier/scenarios/astm/netrid/v22a/dss/isa_subscription_interactions.md
+++ b/monitoring/uss_qualifier/scenarios/astm/netrid/v22a/dss/isa_subscription_interactions.md
@@ -51,7 +51,7 @@ When a pre-existing ISA needs to be deleted to ensure a clean workspace, any sub
 This test case will do the following, using the DSS being tested:
 
 1. Create an ISA with the configured footprint,
-2. Create a subscription for the ISA's area, and expect:
+2. Do several variants of creating and possibly mutating a subscription, either in or close to the ISA's area, and expect:
    - to find the created ISA mentioned in the reply
    - the notification index of the subscription to be 0
 3. Modify the ISA, and expect:
@@ -62,7 +62,10 @@ This test case will do the following, using the DSS being tested:
    - the notification index of the subscription to be greater than it was after the mutation
 5. Delete the subscription.
 
-### ISA Subscription Interactions test step
+### New Subscription within ISA test step
+
+This test step checks for interactions between ISAs and a subscription that is created within the ISA, then
+subsequently mutated to only barely intersect with the ISA.
 
 #### Create an ISA check
 
@@ -122,6 +125,78 @@ Failure to do so means that the DSS is not properly implementing **[astm.f3411.v
 
 Notifications to any subscriber to the created ISA need to be successful.  If a notification cannot be delivered, then the **[astm.f3411.v22a.NET0730](../../../../../requirements/astm/f3411/v22a.md)** requirement to implement the POST ISAs endpoint isn't met.
 
+### New subscription within ISA is mutated to ISA boundary test step
+
+This test step checks for interactions between ISAs and a subscription that is created within the ISA and the mutated
+to only barely overlap with the ISA.
+
+#### Create an ISA check
+
+If the ISA cannot be created, the PUT DSS endpoint in **[astm.f3411.v22a.DSS0030,a](../../../../../requirements/astm/f3411/v22a.md)** is likely not implemented correctly.
+
+#### Create a subscription within the ISA footprint check
+
+The DSS should allow the creation of a subscription within the ISA footprint, otherwise it is in violation of **[astm.f3411.v22a.DSS0030,c](../../../../../requirements/astm/f3411/v22a.md)**
+
+#### Mutate the subscription towards the ISA boundary check
+
+The DSS should allow a valid mutation of a subscription's area, otherwise it is in violation of **[astm.f3411.v22a.DSS0030,c](../../../../../requirements/astm/f3411/v22a.md)**
+
+#### Subscription for the ISA's area mentions the ISA check
+
+A subscription that is created for a volume that intersects with the previously created ISA should mention
+the previously created ISA. If not, the serving DSS is in violation of **[astm.f3411.v22a.DSS0030,c](../../../../../requirements/astm/f3411/v22a.md)**.
+
+#### Mutated subscription has a notification_index of 0 check
+
+A newly created subscription is expected to have a notification index of 0, otherwise the DSS implementation under
+test does not comply with **[astm.f3411.v22a.DSS0030,c](../../../../../requirements/astm/f3411/v22a.md)**
+
+#### Mutate the ISA check
+
+If the ISA cannot be mutated, **[astm.f3411.v22a.DSS0030,a](../../../../../requirements/astm/f3411/v22a.md)** is likely not implemented correctly.
+
+#### Response to the mutation of the ISA contains subscription ID check
+
+When an ISA is mutated, the DSS must return the identifiers for any subscription that was made to the ISA,
+or be in violation of **[astm.f3411.v22a.DSS0030,a](../../../../../requirements/astm/f3411/v22a.md)**.
+
+#### Subscription to an ISA has its notification index incremented after mutation check
+
+When an ISA is mutated, the DSS must increment the notification index of any subscription to that ISA,
+and return the up-to-date subscription in the response to the query mutating the ISA.
+
+Failure to do so means that the DSS is not properly implementing **[astm.f3411.v22a.DSS0030,a](../../../../../requirements/astm/f3411/v22a.md)**.
+
+#### Subscription that only barely overlaps the ISA contains the ISA check
+
+A subscription that is created for a volume that only barely overlaps with the previously created ISA should still
+contain the ISA in the reply from the server, otherwise the DSS does not comply with **[astm.f3411.v22a.DSS0030,c](../../../../../requirements/astm/f3411/v22a.md)**
+
+#### Delete the ISA check
+
+If that ISA cannot be deleted, the **[astm.f3411.v22a.DSS0030,d](../../../../../requirements/astm/f3411/v22a.md)** requirement to implement the ISA deletion endpoint might not be met.
+
+#### Response to the deletion of the ISA contains subscription ID check
+
+When an ISA is deleted, the DSS must return the identifiers for any subscription that was made to the ISA,
+or be in violation of **[astm.f3411.v22a.DSS0030,b](../../../../../requirements/astm/f3411/v22a.md)**.
+
+#### Subscription to an ISA has its notification index incremented after deletion check
+
+When an ISA is deleted, the DSS must increment the notification index of any subscription to that ISA,
+and return the up-to-date subscription in the response to the query deleting the ISA.
+
+Failure to do so means that the DSS is not properly implementing **[astm.f3411.v22a.DSS0030,a](../../../../../requirements/astm/f3411/v22a.md)**.
+
+#### Subscription can be deleted check
+
+**[astm.f3411.v22a.DSS0030,d](../../../../../requirements/astm/f3411/v22a.md)** requires the implementation of the DSS endpoint to allow callers to delete subscriptions they created.
+
+#### Notified subscriber check
+
+Notifications to any subscriber to the created ISA need to be successful.  If a notification cannot be delivered, then the **[astm.f3411.v22a.NET0730](../../../../../requirements/astm/f3411/v22a.md)** requirement to implement the POST ISAs endpoint isn't met.
+
 ## Cleanup
 
 The cleanup phase of this test scenario attempts to remove the ISA if the test ended prematurely while
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py b/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
index fee5010cb1..e87ac2555b 100644
--- a/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
@@ -8,3 +8,4 @@
 from .dss_interoperability import DSSInteroperability
 from .aggregate_checks import AggregateChecks
 from .prep_planners import PrepareFlightPlanners
+from .off_nominal_planning.down_uss import DownUSS
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/__init__.py b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.md b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.md
new file mode 100644
index 0000000000..24556a788c
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.md
@@ -0,0 +1,125 @@
+# Off-Nominal planning: down USS test scenario
+
+## Description
+This test aims to test the strategic coordination requirements that relate to the down USS mechanism:
+- **[astm.f3548.v21.SCD0005](../../../../requirements/astm/f3548/v21.md)**
+- **[astm.f3548.v21.SCD0010](../../../../requirements/astm/f3548/v21.md)**
+
+It involves a single tested USS. The USS qualifier acts as a virtual USS that may have its availability set to down.
+
+## Resources
+### flight_intents
+FlightIntentsResource that provides the following flight intents:
+
+<table>
+  <tr>
+    <th>Flight intent ID</th>
+    <th>Flight name</th>
+    <th>Priority</th>
+    <th>State</th><!-- TODO: Update with usage_state and uas_state when new flight planning API is adopted -->
+    <th>Must conflict with</th>
+    <th>Must not conflict with</th>
+  </tr>
+  <tr>
+    <td><code>flight_1_planned_vol_A</code></td>
+    <td rowspan="2">Flight 1</td>
+    <td rowspan="5">Any</td>
+    <td>Accepted</td>
+    <td rowspan="2">Flight 2</td>
+    <td rowspan="2">Flight 2m</td>
+  </tr>
+  <tr>
+    <td><code>flight_2_planned_vol_A</code></td>
+    <td rowspan="2">Flight 2</td>
+    <td rowspan="3">Higher than Flight 1*</td>
+    <td>Accepted</td>
+    <td rowspan="2">Flight 1</td>
+    <td rowspan="2">N/A</td>
+  </tr>
+</table>
+
+
+### tested_uss
+FlightPlannerResource that is under test and will manage flight 1.
+
+### dss
+DSSInstanceResource that provides access to a DSS instance where:
+- flight creation/sharing can be verified,
+- the USS qualifier acting as a virtual USS can create operational intents, and
+- the USS qualifier can act as an availability arbitrator.
+
+## Setup test case
+### Resolve USS ID of virtual USS test step
+Make a dummy request to the DSS in order to resolve the USS ID of the virtual USS.
+
+#### Successful dummy query check
+
+### [Restore virtual USS availability test step](../set_uss_available.md)
+
+### Clear operational intents created by virtual USS test step
+Delete any leftover operational intents created at DSS by virtual USS.
+
+#### Successful operational intents cleanup check
+If the search for own operational intents or their deletion fail, this check fails per **[astm.f3548.v21.DSS0005](../../../../requirements/astm/f3548/v21.md)**.
+
+## Plan flight in conflict with planned flight managed by down USS test case
+This test case aims at testing requirement **[astm.f3548.v21.SCD0005](../../../../requirements/astm/f3548/v21.md)**.
+
+### Virtual USS plans high-priority flight 2 test step
+The USS qualifier, acting as a virtual USS, creates an operational intent at the DSS with a high priority and a non-working base URL.
+The objective is to make the later request by the tested USS to retrieve operational intent details to fail.
+
+#### Operational intent successfully created check
+If the creation of the operational intent reference at the DSS fails, this check fails per **[astm.f3548.v21.DSS0005](../../../../requirements/astm/f3548/v21.md)**.
+
+### [Declare virtual USS as down at DSS test step](../set_uss_down.md)
+
+### Tested USS attempts to plan low-priority flight 1 test step
+The low-priority flight 1 of the tested USS conflicts with high-priority flight 2 of the virtual USS.
+However, since:
+- the virtual USS is declared as down at the DSS,
+- it does not respond for operational intent details, and
+- the operational intent for flight 2 is in 'Planned' state,
+The tested USS should evaluate the operational intent of flight 2 as having the lowest bound priority status, i.e. a priority strictly lower than the lowest priority allowed by the local regulation.
+
+As such, the tested USS may either:
+- Successfully plan flight 1 over the higher-priority flight 2, or
+- Decide to be more conservative and reject the planning of flight 1.
+
+#### Successful planning check
+All flight intent data provided is correct and the USS should have either successfully planned the flight per **[astm.f3548.v21.SCD0005](../../../../requirements/astm/f3548/v21.md)**,
+or rejected properly the planning if it decided to be more conservative with such conflicts.
+If the USS indicates that the injection attempt failed, this check will fail.
+
+Do take note that if the USS rejects the planning, this check will not fail, but the following *Rejected planning check*
+will. Refer to this check for more information.
+
+#### Rejected planning check
+All flight intent data provided is correct and the USS should have either successfully planned the flight or rejected
+properly the planning if it decided to be more conservative with such conflicts.
+If the USS rejects the planning, this check will fail with a low severity per **[astm.f3548.v21.SCD0005](../../../../requirements/astm/f3548/v21.md)**.
+This won't actually fail the test but will serve as a warning.
+
+#### Failure check
+All flight intent data provided was complete and correct. It should have been processed successfully, allowing the USS
+to reject or accept the flight. If the USS indicates that the injection attempt failed, this check will fail per
+**[interuss.automated_testing.flight_planning.ExpectedBehavior](../../../../requirements/interuss/automated_testing/flight_planning.md)**.
+
+### [Validate low-priority flight 1 status test step](../validate_shared_operational_intent.md)
+This step validates that the response of the USS is consistent with the flight shared, i.e. either it was properly
+planned, or the USS rejected the planning.
+
+If the planning was accepted, flight 1 should have been shared.
+If the planning was rejected, flight 1 should not have been shared, thus should not exist.
+
+## Cleanup
+### Availability of virtual USS restored check
+**[astm.f3548.v21.DSS0100](../../../../requirements/astm/f3548/v21.md)**
+
+### Successful flight deletion check
+Delete flights injected at USS through the flight planning interface.
+**[interuss.automated_testing.flight_planning.DeleteFlightSuccess](../../../../requirements/interuss/automated_testing/flight_planning.md)**
+
+### Successful operational intents cleanup check
+Delete operational intents created at DSS by virtual USS.
+If the search for own operational intents or their deletion fail, this check fails per **[astm.f3548.v21.DSS0005](../../../../requirements/astm/f3548/v21.md)**.
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.py b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.py
new file mode 100644
index 0000000000..2b766306bc
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.py
@@ -0,0 +1,299 @@
+from typing import Optional, List
+
+import arrow
+
+from monitoring.monitorlib.geotemporal import Volume4DCollection
+from monitoring.uss_qualifier.common_data_definitions import Severity
+from uas_standards.astm.f3548.v21.api import OperationalIntentState
+from uas_standards.interuss.automated_testing.scd.v1.api import (
+    InjectFlightResponseResult,
+)
+
+from monitoring.uss_qualifier.resources.astm.f3548.v21 import DSSInstanceResource
+from monitoring.uss_qualifier.resources.astm.f3548.v21.dss import DSSInstance
+from monitoring.uss_qualifier.resources.flight_planning import (
+    FlightIntentsResource,
+)
+from monitoring.uss_qualifier.resources.flight_planning.flight_intent import (
+    FlightIntent,
+)
+from monitoring.uss_qualifier.resources.flight_planning.flight_planner import (
+    FlightPlanner,
+)
+from monitoring.uss_qualifier.resources.flight_planning.flight_planners import (
+    FlightPlannerResource,
+)
+from monitoring.uss_qualifier.scenarios.astm.utm.test_steps import (
+    OpIntentValidator,
+    set_uss_available,
+    set_uss_down,
+)
+from monitoring.uss_qualifier.scenarios.scenario import TestScenario
+from monitoring.uss_qualifier.scenarios.flight_planning.test_steps import (
+    cleanup_flights,
+    submit_flight_intent,
+)
+from monitoring.uss_qualifier.suites.suite import ExecutionContext
+
+
+class DownUSS(TestScenario):
+    flight_1_id: Optional[str] = None
+    flight_1_planned_vol_A: FlightIntent
+
+    flight_2_planned_vol_A: FlightIntent
+
+    uss_qualifier_sub: str
+
+    tested_uss: FlightPlanner
+    dss: DSSInstance
+
+    def __init__(
+        self,
+        flight_intents: FlightIntentsResource,
+        tested_uss: FlightPlannerResource,
+        dss: DSSInstanceResource,
+    ):
+        super().__init__()
+        self.tested_uss = tested_uss.flight_planner
+        self.dss = dss.dss
+
+        _flight_intents = {
+            k: FlightIntent.from_flight_info_template(v)
+            for k, v in flight_intents.get_flight_intents().items()
+        }
+
+        extents = []
+        for intent in _flight_intents.values():
+            extents.extend(intent.request.operational_intent.volumes)
+            extents.extend(intent.request.operational_intent.off_nominal_volumes)
+        self._intents_extent = Volume4DCollection.from_interuss_scd_api(
+            extents
+        ).bounding_volume.to_f3548v21()
+
+        try:
+            (self.flight_1_planned_vol_A, self.flight_2_planned_vol_A,) = (
+                _flight_intents["flight_1_planned_vol_A"],
+                _flight_intents["flight_2_planned_vol_A"],
+            )
+
+            now = arrow.utcnow().datetime
+            for intent_name, intent in _flight_intents.items():
+                if (
+                    intent.request.operational_intent.state
+                    == OperationalIntentState.Activated
+                ):
+                    assert Volume4DCollection.from_interuss_scd_api(
+                        intent.request.operational_intent.volumes
+                        + intent.request.operational_intent.off_nominal_volumes
+                    ).has_active_volume(
+                        now
+                    ), f"at least one volume of activated intent {intent_name} must be active now (now is {now})"
+
+            assert (
+                self.flight_1_planned_vol_A.request.operational_intent.state
+                == OperationalIntentState.Accepted
+            ), "flight_1_planned_vol_A must have state Accepted"
+            assert (
+                self.flight_2_planned_vol_A.request.operational_intent.state
+                == OperationalIntentState.Accepted
+            ), "flight_2_planned_vol_A must have state Accepted"
+
+            # TODO: check that flight data is the same across the different versions of the flight
+
+            assert (
+                self.flight_2_planned_vol_A.request.operational_intent.priority
+                > self.flight_1_planned_vol_A.request.operational_intent.priority
+            ), "flight_2 must have higher priority than flight_1"
+            assert Volume4DCollection.from_interuss_scd_api(
+                self.flight_1_planned_vol_A.request.operational_intent.volumes
+            ).intersects_vol4s(
+                Volume4DCollection.from_interuss_scd_api(
+                    self.flight_2_planned_vol_A.request.operational_intent.volumes
+                )
+            ), "flight_1_planned_vol_A and flight_2_planned_vol_A must intersect"
+
+        except KeyError as e:
+            raise ValueError(
+                f"`{self.me()}` TestScenario requirements for flight_intents not met: missing flight intent {e}"
+            )
+        except AssertionError as e:
+            raise ValueError(
+                f"`{self.me()}` TestScenario requirements for flight_intents not met: {e}"
+            )
+
+    def run(self, context: ExecutionContext):
+        self.begin_test_scenario(context)
+
+        self.record_note(
+            "Tested USS",
+            f"{self.tested_uss.config.participant_id}",
+        )
+
+        self.begin_test_case("Setup")
+        self._setup()
+        self.end_test_case()
+
+        self.begin_test_case(
+            "Plan flight in conflict with planned flight managed by down USS"
+        )
+        self._plan_flight_conflict_planned()
+        self.end_test_case()
+
+        self.end_test_scenario()
+
+    def _setup(self):
+
+        self.begin_test_step("Resolve USS ID of virtual USS")
+        _, dummy_query = self.dss.find_op_intent(self._intents_extent)
+        with self.check("Successful dummy query", [self.dss.participant_id]) as check:
+            if dummy_query.status_code != 200:
+                check.record_failed(
+                    summary="Failed to query DSS",
+                    severity=Severity.High,
+                    details=f"DSS responded code {dummy_query.status_code}; error message: {dummy_query.error_message}",
+                    query_timestamps=[dummy_query.request.timestamp],
+                )
+        self.uss_qualifier_sub = self.dss.client.auth_adapter.get_sub()
+        self.record_note(
+            "USS ID of virtual USS",
+            f"{self.uss_qualifier_sub}",
+        )
+        self.end_test_step()
+
+        set_uss_available(
+            self, "Restore virtual USS availability", self.dss, self.uss_qualifier_sub
+        )
+
+        self.begin_test_step("Clear operational intents created by virtual USS")
+        self._clear_op_intents()
+        self.end_test_step()
+
+    def _plan_flight_conflict_planned(self):
+
+        # Virtual USS plans high-priority flight 2 test step
+        self.begin_test_step("Virtual USS plans high-priority flight 2")
+        oi_ref, _, query = self.dss.put_op_intent(
+            Volume4DCollection.from_interuss_scd_api(
+                self.flight_2_planned_vol_A.request.operational_intent.volumes
+            ).to_f3548v21(),
+            [],  # we assume there is no other operational intent in that area
+            OperationalIntentState.Accepted,
+            "https://fake.uss/down",
+        )
+        self.record_query(query)
+        with self.check(
+            "Operational intent successfully created", [self.dss.participant_id]
+        ) as check:
+            if oi_ref is None:
+                check.record_failed(
+                    "Operational intent not successfully created",
+                    Severity.High,
+                    f"DSS responded code {query.status_code}; error message: {query.error_message}",
+                    query_timestamps=[query.request.timestamp],
+                )
+        self.end_test_step()
+
+        # Declare virtual USS as down at DSS test step
+        set_uss_down(
+            self, "Declare virtual USS as down at DSS", self.dss, self.uss_qualifier_sub
+        )
+
+        # Tested USS attempts to plan low-priority flight 1 test step
+        with OpIntentValidator(
+            self,
+            self.tested_uss,
+            self.dss,
+            "Validate low-priority flight 1 status",
+            self._intents_extent,
+        ) as validator:
+            expected_results = {
+                InjectFlightResponseResult.Planned,
+                # the following two results are considered expected in order to fail another check as low severity
+                InjectFlightResponseResult.Rejected,
+                InjectFlightResponseResult.ConflictWithFlight,
+            }
+            failed_checks = {
+                InjectFlightResponseResult.Failed: "Failure",
+                InjectFlightResponseResult.Rejected: (
+                    "Rejected planning",
+                    Severity.Low,
+                ),
+                InjectFlightResponseResult.ConflictWithFlight: (
+                    "Rejected planning",
+                    Severity.Low,
+                ),
+            }
+
+            resp, flight_id = submit_flight_intent(
+                self,
+                "Tested USS attempts to plan low-priority flight 1",
+                "Successful planning",
+                expected_results,
+                failed_checks,
+                self.tested_uss,
+                self.flight_1_planned_vol_A.request,
+            )
+
+            if resp.result == InjectFlightResponseResult.Planned:
+                validator.expect_shared(self.flight_1_planned_vol_A.request)
+            elif (
+                resp.result == InjectFlightResponseResult.Rejected
+                or resp.result == InjectFlightResponseResult.ConflictWithFlight
+            ):
+                validator.expect_not_shared()
+
+    def _clear_op_intents(self):
+        oi_refs, find_query = self.dss.find_op_intent(self._intents_extent)
+        self.record_query(find_query)
+
+        with self.check(
+            "Successful operational intents cleanup", [self.dss.participant_id]
+        ) as check:
+            if find_query.status_code != 200:
+                check.record_failed(
+                    summary=f"Failed to query operational intents from DSS in {self._intents_extent} for cleanup",
+                    severity=Severity.High,
+                    details=f"DSS responded code {find_query.status_code}; error message: {find_query.error_message}",
+                    query_timestamps=[find_query.request.timestamp],
+                )
+
+            for oi_ref in oi_refs:
+                if (
+                    oi_ref.ovn is not None
+                ):  # if the OVN is specified, this op intent belongs to our virtual USS
+                    del_oi, _, del_query = self.dss.delete_op_intent(
+                        oi_ref.id, oi_ref.ovn
+                    )
+                    self.record_query(del_query)
+
+                    if del_oi is None:
+                        check.record_failed(
+                            summary=f"Failed to delete op intent {oi_ref.id} from DSS",
+                            severity=Severity.Medium,
+                            details=f"DSS responded code {del_query.status_code}; error message: {del_query.error_message}",
+                            query_timestamps=[del_query.request.timestamp],
+                        )
+
+    def cleanup(self):
+        self.begin_cleanup()
+
+        with self.check(
+            "Availability of virtual USS restored", [self.dss.participant_id]
+        ) as check:
+            availability_version, avail_query = self.dss.set_uss_availability(
+                self.uss_qualifier_sub,
+                True,
+            )
+            self.record_query(avail_query)
+            if availability_version is None:
+                check.record_failed(
+                    summary=f"Availability of USS {self.uss_qualifier_sub} could not be set to available",
+                    severity=Severity.High,
+                    details=f"DSS responded code {avail_query.status_code}; error message: {avail_query.error_message}",
+                    query_timestamps=[avail_query.request.timestamp],
+                )
+
+        cleanup_flights(self, [self.tested_uss])
+        self._clear_op_intents()
+
+        self.end_cleanup()
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/set_uss_available.md b/monitoring/uss_qualifier/scenarios/astm/utm/set_uss_available.md
new file mode 100644
index 0000000000..67870dc7f5
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/set_uss_available.md
@@ -0,0 +1,8 @@
+# Set USS availability to 'Available' test step
+
+This step sets the USS availability to 'Available' at the DSS.
+
+See `set_uss_available` in [test_steps.py](test_steps.py).
+
+## USS availability successfully set to 'Available' check
+**[astm.f3548.v21.DSS0100](../../../requirements/astm/f3548/v21.md)**
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/set_uss_down.md b/monitoring/uss_qualifier/scenarios/astm/utm/set_uss_down.md
new file mode 100644
index 0000000000..e470279f81
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/set_uss_down.md
@@ -0,0 +1,8 @@
+# Set USS availability to 'Down' test step
+
+This step sets the USS availability to 'Down' at the DSS.
+
+See `set_uss_down` in [test_steps.py](test_steps.py).
+
+## USS availability successfully set to 'Down' check
+**[astm.f3548.v21.DSS0100](../../../requirements/astm/f3548/v21.md)**
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/test_steps.py b/monitoring/uss_qualifier/scenarios/astm/utm/test_steps.py
index ca2baadc3e..3b122a0062 100644
--- a/monitoring/uss_qualifier/scenarios/astm/utm/test_steps.py
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/test_steps.py
@@ -432,3 +432,69 @@ def _operational_intent_shared_check(
                 oi_ref = self._new_oi_ref
 
         return oi_ref
+
+
+def set_uss_available(
+    scenario: TestScenarioType,
+    test_step: str,
+    dss: DSSInstance,
+    uss_sub: str,
+) -> str:
+    """Set the USS availability to 'Available'.
+
+    This function implements the test step described in set_uss_available.md.
+
+    Returns:
+        The new version of the USS availability.
+    """
+    scenario.begin_test_step(test_step)
+    availability_version, avail_query = dss.set_uss_availability(
+        uss_sub,
+        True,
+    )
+    scenario.record_query(avail_query)
+    with scenario.check(
+        "USS availability successfully set to 'Available'", [dss.participant_id]
+    ) as check:
+        if availability_version is None:
+            check.record_failed(
+                summary=f"Availability of USS {uss_sub} could not be set to available",
+                severity=Severity.High,
+                details=f"DSS responded code {avail_query.status_code}; error message: {avail_query.error_message}",
+                query_timestamps=[avail_query.request.timestamp],
+            )
+    scenario.end_test_step()
+    return availability_version
+
+
+def set_uss_down(
+    scenario: TestScenarioType,
+    test_step: str,
+    dss: DSSInstance,
+    uss_sub: str,
+) -> str:
+    """Set the USS availability to 'Down'.
+
+    This function implements the test step described in set_uss_down.md.
+
+    Returns:
+        The new version of the USS availability.
+    """
+    scenario.begin_test_step(test_step)
+    availability_version, avail_query = dss.set_uss_availability(
+        uss_sub,
+        False,
+    )
+    scenario.record_query(avail_query)
+    with scenario.check(
+        "USS availability successfully set to 'Down'", [dss.participant_id]
+    ) as check:
+        if availability_version is None:
+            check.record_failed(
+                summary=f"Availability of USS {uss_sub} could not be set to down",
+                severity=Severity.High,
+                details=f"DSS responded code {avail_query.status_code}; error message: {avail_query.error_message}",
+                query_timestamps=[avail_query.request.timestamp],
+            )
+    scenario.end_test_step()
+    return availability_version
diff --git a/monitoring/uss_qualifier/scenarios/flight_planning/test_steps.py b/monitoring/uss_qualifier/scenarios/flight_planning/test_steps.py
index a90d4264ad..f02a2db5d8 100644
--- a/monitoring/uss_qualifier/scenarios/flight_planning/test_steps.py
+++ b/monitoring/uss_qualifier/scenarios/flight_planning/test_steps.py
@@ -441,7 +441,7 @@ def submit_flight(
                     specific_failed_check.record_failed(
                         summary=f"Flight unexpectedly {resp.activity_result}",
                         severity=check_severity,
-                        details=f'{flight_planner.participant_id} indicated {resp.activity_result} rather than the expected {" or ".join([activity_res for activity_res,_ in expected_results])}{notes_suffix}',
+                        details=f'{flight_planner.participant_id} indicated {resp.activity_result} rather than the expected {" or ".join(r[0] for r in expected_results)}{notes_suffix}',
                         query_timestamps=[query.request.timestamp],
                     )
 
@@ -450,9 +450,9 @@ def submit_flight(
             return resp, flight_id
         else:
             check.record_failed(
-                summary=f"Flight unexpectedly {resp.activity_result}",
+                summary=f"Flight planning activity outcome was not expected",
                 severity=Severity.High,
-                details=f'{flight_planner.participant_id} indicated {resp.activity_result} rather than the expected {" or ".join([activity_res for activity_res,_ in expected_results])}{notes_suffix}',
+                details=f'{flight_planner.participant_id} indicated {resp.activity_result} with flight plan status {resp.flight_plan_status} rather than the expected {" or ".join(f"({expected_results[0]}, {expected_results[1]})")}{notes_suffix}',
                 query_timestamps=[query.request.timestamp],
             )
 
@@ -549,9 +549,9 @@ def delete_flight(
             return resp
         else:
             check.record_failed(
-                summary=f"Flight deletion attempt unexpectedly {(resp.activity_result,resp.flight_plan_status)}",
+                summary=f"Flight deletion attempt unexpectedly {resp.activity_result} with flight plan status {resp.flight_plan_status}",
                 severity=Severity.High,
-                details=f"{flight_planner.participant_id} indicated {(resp.activity_result,resp.flight_plan_status)} rather than the expected {PlanningActivityResult.Completed,FlightPlanStatus.Closed}{notes_suffix}",
+                details=f"{flight_planner.participant_id} indicated {resp.activity_result} with flight plan status {resp.flight_plan_status} rather than the expected Completed with flight plan status Closed{notes_suffix}",
                 query_timestamps=[query.request.timestamp],
             )
 
@@ -599,7 +599,7 @@ def cleanup_flights_fp_client(
                 else:
                     check.record_failed(
                         summary="Failed to delete flight",
-                        details=f"USS indicated: {resp.notes}"
+                        details=f"USS indicated {resp.activity_result} with flight plan status {resp.flight_plan_status} rather than the expected Completed with flight plan status Closed.  Its notes were: {resp.notes}"
                         if "notes" in resp
                         else "See query",
                         severity=Severity.Medium,
diff --git a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
index d6a392f459..4c49a431c3 100644
--- a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
+++ b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
@@ -15,7 +15,9 @@
     1. Scenario: [Nominal planning: not permitted conflict with equal priority](../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md) ([`scenarios.astm.utm.ConflictEqualPriorityNotPermitted`](../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.py))
 6. Action generator: [`action_generators.flight_planning.FlightPlannerCombinations`](../../../action_generators/flight_planning/planner_combinations.py)
     1. Scenario: [Data Validation of GET operational intents by USS](../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md) ([`scenarios.astm.utm.data_exchange_validation.GetOpResponseDataValidationByUSS`](../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.py))
-7. Scenario: [ASTM F3548 UTM aggregate checks](../../../scenarios/astm/utm/aggregate_checks.md) ([`scenarios.astm.utm.AggregateChecks`](../../../scenarios/astm/utm/aggregate_checks.py))
+7. Action generator: [`action_generators.flight_planning.FlightPlannerCombinations`](../../../action_generators/flight_planning/planner_combinations.py)
+    1. Scenario: [Off-Nominal planning: down USS](../../../scenarios/astm/utm/off_nominal_planning/down_uss.md) ([`scenarios.astm.utm.DownUSS`](../../../scenarios/astm/utm/off_nominal_planning/down_uss.py))
+8. Scenario: [ASTM F3548 UTM aggregate checks](../../../scenarios/astm/utm/aggregate_checks.md) ([`scenarios.astm.utm.AggregateChecks`](../../../scenarios/astm/utm/aggregate_checks.py))
 
 ## [Checked requirements](../../README.md#checked-requirements)
 
@@ -27,10 +29,15 @@
     <th><a href="../../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="21" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="23" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+  </tr>
+  <tr>
+    <td><a href="../../../requirements/astm/f3548/v21.md">DSS0100</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -50,17 +57,17 @@
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0015</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0020</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0025</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0030</a></td>
@@ -72,6 +79,11 @@
     <td>Implemented</td>
     <td><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../../requirements/astm/f3548/v21.md">SCD0005</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
+  </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -125,12 +137,12 @@
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">USS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">USS0105</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td rowspan="6" style="vertical-align:top;"><a href="../../../requirements/interuss/automated_testing/flight_planning.md">interuss<br>.automated_testing<br>.flight_planning</a></td>
@@ -141,17 +153,17 @@
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">DeleteFlightSuccess</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">ExpectedBehavior</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">FlightCoveredByOperationalIntent</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">ImplementAPI</a></td>
diff --git a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
index 8ff3d6a2cc..77e81f5ad6 100644
--- a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
+++ b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
@@ -125,6 +125,27 @@ actions:
       roles:
         - uss1
   on_failure: Continue
+- action_generator:
+    generator_type: action_generators.flight_planning.FlightPlannerCombinations
+    resources:
+      flight_planners: flight_planners
+      nominal_planning_selector: nominal_planning_selector?
+      conflicting_flights: conflicting_flights
+      dss: dss
+    specification:
+      action_to_repeat:
+        test_scenario:
+          scenario_type: scenarios.astm.utm.DownUSS
+          resources:
+            flight_intents: conflicting_flights
+            tested_uss: uss1
+            dss: dss
+        on_failure: Continue
+      combination_selector_source: nominal_planning_selector
+      flight_planners_source: flight_planners
+      roles:
+        - uss1
+  on_failure: Continue
 - test_scenario:
     scenario_type: scenarios.astm.utm.AggregateChecks
     resources:
diff --git a/monitoring/uss_qualifier/suites/faa/uft/message_signing.md b/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
index 0db857d77a..475cae5788 100644
--- a/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
+++ b/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
@@ -18,10 +18,15 @@
     <th><a href="../../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="21" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="23" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+  </tr>
+  <tr>
+    <td><a href="../../../requirements/astm/f3548/v21.md">DSS0100</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -41,17 +46,17 @@
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0015</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0020</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0025</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">OPIN0030</a></td>
@@ -63,6 +68,11 @@
     <td>Implemented</td>
     <td><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../../requirements/astm/f3548/v21.md">SCD0005</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
+  </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -116,12 +126,12 @@
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">USS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">USS0105</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td rowspan="6" style="vertical-align:top;"><a href="../../../requirements/interuss/automated_testing/flight_planning.md">interuss<br>.automated_testing<br>.flight_planning</a></td>
@@ -132,17 +142,17 @@
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">DeleteFlightSuccess</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">ExpectedBehavior</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">FlightCoveredByOperationalIntent</a></td>
     <td>Implemented</td>
-    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/interuss/automated_testing/flight_planning.md">ImplementAPI</a></td>
diff --git a/monitoring/uss_qualifier/suites/uspace/flight_auth.md b/monitoring/uss_qualifier/suites/uspace/flight_auth.md
index 927a06c149..1a677d1cd7 100644
--- a/monitoring/uss_qualifier/suites/uspace/flight_auth.md
+++ b/monitoring/uss_qualifier/suites/uspace/flight_auth.md
@@ -19,10 +19,15 @@
     <th><a href="../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="21" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="23" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+  </tr>
+  <tr>
+    <td><a href="../../requirements/astm/f3548/v21.md">DSS0100</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -42,17 +47,17 @@
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0015</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0020</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0025</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0030</a></td>
@@ -64,6 +69,11 @@
     <td>Implemented</td>
     <td><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../requirements/astm/f3548/v21.md">SCD0005</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
+  </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -117,12 +127,12 @@
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">USS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">USS0105</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td rowspan="6" style="vertical-align:top;"><a href="../../requirements/interuss/automated_testing/flight_planning.md">interuss<br>.automated_testing<br>.flight_planning</a></td>
@@ -133,17 +143,17 @@
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">DeleteFlightSuccess</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">ExpectedBehavior</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">FlightCoveredByOperationalIntent</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">ImplementAPI</a></td>
diff --git a/monitoring/uss_qualifier/suites/uspace/required_services.md b/monitoring/uss_qualifier/suites/uspace/required_services.md
index 964c6d4576..d1cfdf0887 100644
--- a/monitoring/uss_qualifier/suites/uspace/required_services.md
+++ b/monitoring/uss_qualifier/suites/uspace/required_services.md
@@ -449,10 +449,15 @@
     <td><a href="../../scenarios/astm/netrid/v22a/dss/isa_expiry.md">ASTM NetRID DSS: ISA Expiry</a><br><a href="../../scenarios/astm/netrid/v22a/dss/isa_subscription_interactions.md">ASTM NetRID DSS: ISA Subscription Interactions</a><br><a href="../../scenarios/astm/netrid/v22a/dss/isa_simple.md">ASTM NetRID DSS: Simple ISA</a><br><a href="../../scenarios/astm/netrid/v22a/dss/isa_validation.md">ASTM NetRID DSS: Submitted ISA Validations</a><br><a href="../../scenarios/astm/netrid/v22a/dss/token_validation.md">ASTM NetRID DSS: Token Validation</a></td>
   </tr>
   <tr>
-    <td rowspan="21" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="23" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/prep_planners.md">ASTM F3548 flight planners preparation</a><br><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+  </tr>
+  <tr>
+    <td><a href="../../requirements/astm/f3548/v21.md">DSS0100</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -472,17 +477,17 @@
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0015</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0020</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0025</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">OPIN0030</a></td>
@@ -494,6 +499,11 @@
     <td>Implemented</td>
     <td><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
+  <tr>
+    <td><a href="../../requirements/astm/f3548/v21.md">SCD0005</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a></td>
+  </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -547,12 +557,12 @@
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">USS0005</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">USS0105</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td rowspan="6" style="vertical-align:top;"><a href="../../requirements/interuss/automated_testing/flight_planning.md">interuss<br>.automated_testing<br>.flight_planning</a></td>
@@ -563,17 +573,17 @@
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">DeleteFlightSuccess</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">ExpectedBehavior</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/uspace/flight_auth/validation.md">Flight authorisation validation</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">FlightCoveredByOperationalIntent</a></td>
     <td>Implemented</td>
-    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
+    <td><a href="../../scenarios/astm/utm/data_exchange_validation/get_op_data_validation.md">Data Validation of GET operational intents by USS</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_higher_priority/conflict_higher_priority.md">Nominal planning: conflict with higher priority</a><br><a href="../../scenarios/astm/utm/nominal_planning/conflict_equal_priority_not_permitted/conflict_equal_priority_not_permitted.md">Nominal planning: not permitted conflict with equal priority</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/flight_intent_validation/flight_intent_validation.md">Validation of operational intents</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/interuss/automated_testing/flight_planning.md">ImplementAPI</a></td>