diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py b/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
index e87ac2555b..07d2b0f5a9 100644
--- a/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/__init__.py
@@ -9,3 +9,6 @@
 from .aggregate_checks import AggregateChecks
 from .prep_planners import PrepareFlightPlanners
 from .off_nominal_planning.down_uss import DownUSS
+from .off_nominal_planning.down_uss_equal_priority_not_permitted import (
+    DownUSSEqualPriorityNotPermitted,
+)
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
index 24556a788c..ce6967bb65 100644
--- 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
@@ -1,9 +1,8 @@
 # Off-Nominal planning: down USS test scenario
 
 ## Description
-This test aims to test the strategic coordination requirements that relate to the down USS mechanism:
+This test aims to test the strategic coordination requirements that relate to the down USS mechanism in the general case:
 - **[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.
 
@@ -17,24 +16,12 @@ FlightIntentsResource that provides the following flight intents:
     <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>
 
@@ -62,11 +49,12 @@ 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.
+### Virtual USS creates conflicting operational intent test step
+The USS qualifier, acting as a virtual USS, creates an operational intent at the DSS with 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
@@ -75,15 +63,15 @@ If the creation of the operational intent reference at the DSS fails, this check
 ### [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.
+The low-priority flight 1 of the tested USS conflicts with the operational intent 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.
+- the conflicting operational intent is in the 'Accepted' state,
+The tested USS should evaluate the conflicting operational intent 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
+- Successfully plan flight 1 over the conflicting operational intent, or
 - Decide to be more conservative and reject the planning of flight 1.
 
 #### Successful planning check
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
index 2b766306bc..11361b0608 100644
--- 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
@@ -1,10 +1,13 @@
-from typing import Optional, List
+from typing import Dict, Optional
 
 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.astm.f3548.v21.api import (
+    OperationalIntentState,
+    OperationalIntentReference,
+)
 from uas_standards.interuss.automated_testing.scd.v1.api import (
     InjectFlightResponseResult,
 )
@@ -37,11 +40,8 @@
 
 
 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
@@ -57,7 +57,7 @@ def __init__(
         self.tested_uss = tested_uss.flight_planner
         self.dss = dss.dss
 
-        _flight_intents = {
+        _flight_intents: Dict[str, FlightIntent] = {
             k: FlightIntent.from_flight_info_template(v)
             for k, v in flight_intents.get_flight_intents().items()
         }
@@ -70,47 +70,31 @@ def __init__(
             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
+            ):
+                if not Volume4DCollection.from_interuss_scd_api(
+                    intent.request.operational_intent.volumes
+                    + intent.request.operational_intent.off_nominal_volumes
+                ).has_active_volume(now):
+                    err_msg = f"at least one volume of activated intent {intent_name} must be active now (now is {now})"
+                    raise ValueError(
+                        f"`{self.me()}` TestScenario requirements for flight_intents not met: {err_msg}"
+                    )
 
-            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})"
+        self._parse_flight_intents(_flight_intents)
+
+    def _parse_flight_intents(self, flight_intents: Dict[str, FlightIntent]) -> None:
+        try:
+            self.flight_1_planned_vol_A = flight_intents["flight_1_planned_vol_A"]
 
             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(
@@ -168,30 +152,68 @@ def _setup(self):
         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")
+    def _put_conflicting_op_intent_step(
+        self,
+        conflicting_intent: FlightIntent,
+        target_state: OperationalIntentState,
+        old_op_intent: Optional[OperationalIntentReference] = None,
+    ) -> OperationalIntentReference:
+        if old_op_intent is not None:
+            key = [old_op_intent.ovn]
+            oi_id = old_op_intent.id
+            oi_ovn = old_op_intent.ovn
+        else:
+            key = None
+            oi_id = None
+            oi_ovn = None
+
+        if target_state == OperationalIntentState.Accepted:
+            msg_action = "creates"
+            msg_action_past = "created"
+        elif target_state == OperationalIntentState.Activated:
+            msg_action = "activates"
+            msg_action_past = "activated"
+        elif target_state == OperationalIntentState.Nonconforming:
+            msg_action = "transitions to Nonconforming"
+            msg_action_past = "transitioned to Nonconforming"
+        elif target_state == OperationalIntentState.Contingent:
+            msg_action = "transitions to Contingent"
+            msg_action_past = "transitioned to Contingent"
+        else:
+            raise ValueError(f"Invalid state {target_state}")
+
+        self.begin_test_step(f"Virtual USS {msg_action} conflicting operational intent")
         oi_ref, _, query = self.dss.put_op_intent(
             Volume4DCollection.from_interuss_scd_api(
-                self.flight_2_planned_vol_A.request.operational_intent.volumes
+                conflicting_intent.request.operational_intent.volumes
             ).to_f3548v21(),
-            [],  # we assume there is no other operational intent in that area
-            OperationalIntentState.Accepted,
+            key,
+            target_state,
             "https://fake.uss/down",
+            oi_id,
+            oi_ovn,
         )
         self.record_query(query)
         with self.check(
-            "Operational intent successfully created", [self.dss.participant_id]
+            f"Operational intent successfully {msg_action_past}",
+            [self.dss.participant_id],
         ) as check:
             if oi_ref is None:
                 check.record_failed(
-                    "Operational intent not successfully created",
+                    f"Operational intent not successfully {msg_action_past}",
                     Severity.High,
                     f"DSS responded code {query.status_code}; error message: {query.error_message}",
                     query_timestamps=[query.request.timestamp],
                 )
         self.end_test_step()
+        return oi_ref
+
+    def _plan_flight_conflict_planned(self):
+
+        # Virtual USS creates conflicting operational intent test step
+        self._put_conflicting_op_intent_step(
+            self.flight_1_planned_vol_A, OperationalIntentState.Accepted
+        )
 
         # Declare virtual USS as down at DSS test step
         set_uss_down(
diff --git a/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md
new file mode 100644
index 0000000000..66ffb473d0
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md
@@ -0,0 +1,179 @@
+# Off-Nominal planning: down USS with equal priority conflicts not permitted test scenario
+
+## Description
+This test aims to test the strategic coordination requirements that relate to the down USS mechanism in the case where
+equal priority conflicts are not permitted:
+- **[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 -->
+  </tr>
+  <tr>
+    <td><code>flight_2_planned_vol_A</code></td>
+    <td rowspan="2">Flight 2</td>
+    <td rowspan="3">High priority</td>
+    <td>Accepted</td>
+  </tr>
+</table>
+
+
+### tested_uss
+FlightPlannerResource that is under test and will manage flight 2.
+
+### 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 activated flight managed by down USS test case
+This test case aims at testing requirement **[astm.f3548.v21.SCD0010](../../../../requirements/astm/f3548/v21.md)**.
+
+### Virtual USS creates conflicting operational intent test step
+The USS qualifier, acting as a virtual USS, creates an operational intent at the DSS with 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)**.
+
+### Virtual USS activates conflicting operational intent test step
+The USS qualifier, acting as a virtual USS, activates the operational intent previously created at the DSS with 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 activated check
+If the activation 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 high-priority flight 2 test step
+The high-priority flight 2 of the tested USS conflicts with the operational intent 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 conflicting operational intent is in the 'Activated' state,
+- the local regulation does not allow for equal priority conflicts at the highest priority level,
+The tested USS should evaluate the conflicting operational intent as having the highest priority status allowed by the local regulation.
+As such, the tested USS should reject the planning of flight 2.
+
+#### Incorrectly planned check
+All flight intent data provided is correct and the USS should have rejected properly the planning per **[astm.f3548.v21.SCD0010](../../../../requirements/astm/f3548/v21.md)**.
+If the USS indicates that the injection attempt failed, this check will fail.
+If the USS successfully plans the flight or otherwise fails to indicate a conflict, this check will fail.
+
+#### 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 high-priority flight 2 not shared test step](../validate_not_shared_operational_intent.md)
+
+### [Restore virtual USS availability at DSS test step](../set_uss_available.md)
+
+
+## Plan flight in conflict with nonconforming flight managed by down USS test case
+This test case aims at testing requirement **[astm.f3548.v21.SCD0010](../../../../requirements/astm/f3548/v21.md)**.
+
+### Virtual USS transitions to Nonconforming conflicting operational intent test step
+The USS qualifier, acting as a virtual USS, transitions to Nonconforming the operational intent previously created at the DSS with 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 transitioned to Nonconforming check
+If the transition 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 high-priority flight 2 test step
+The high-priority flight 2 of the tested USS conflicts with the operational intent 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 conflicting operational intent is in the 'Nonconforming' state,
+- the local regulation does not allow for equal priority conflicts at the highest priority level,
+The tested USS should evaluate the conflicting operational intent as having the highest priority status allowed by the local regulation.
+As such, the tested USS should reject the planning of flight 2.
+
+#### Incorrectly planned check
+All flight intent data provided is correct and the USS should have rejected properly the planning per **[astm.f3548.v21.SCD0010](../../../../requirements/astm/f3548/v21.md)**.
+If the USS indicates that the injection attempt failed, this check will fail.
+If the USS successfully plans the flight or otherwise fails to indicate a conflict, this check will fail.
+
+#### 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 high-priority flight 2 not shared test step](../validate_not_shared_operational_intent.md)
+
+### [Restore virtual USS availability at DSS test step](../set_uss_available.md)
+
+
+## Plan flight in conflict with contingent flight managed by down USS test case
+This test case aims at testing requirement **[astm.f3548.v21.SCD0010](../../../../requirements/astm/f3548/v21.md)**.
+
+### Virtual USS transitions to Contingent conflicting operational intent test step
+The USS qualifier, acting as a virtual USS, transitions to Contingent the operational intent previously created at the DSS with 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 transitioned to Contingent check
+If the transition 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 high-priority flight 2 test step
+The high-priority flight 2 of the tested USS conflicts with the operational intent 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 conflicting operational intent is in the 'Contingent' state,
+- the local regulation does not allow for equal priority conflicts at the highest priority level,
+The tested USS should evaluate the conflicting operational intent as having the highest priority status allowed by the local regulation.
+As such, the tested USS should reject the planning of flight 2.
+
+#### Incorrectly planned check
+All flight intent data provided is correct and the USS should have rejected properly the planning per **[astm.f3548.v21.SCD0010](../../../../requirements/astm/f3548/v21.md)**.
+If the USS indicates that the injection attempt failed, this check will fail.
+If the USS successfully plans the flight or otherwise fails to indicate a conflict, this check will fail.
+
+#### 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 high-priority flight 2 not shared test step](../validate_not_shared_operational_intent.md)
+
+
+## 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_equal_priority_not_permitted.py b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.py
new file mode 100644
index 0000000000..83d4789802
--- /dev/null
+++ b/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.py
@@ -0,0 +1,213 @@
+from typing import Dict
+
+from uas_standards.astm.f3548.v21.api import (
+    OperationalIntentState,
+    OperationalIntentReference,
+)
+from uas_standards.interuss.automated_testing.scd.v1.api import (
+    InjectFlightResponseResult,
+)
+
+from monitoring.uss_qualifier.resources.flight_planning.flight_intent import (
+    FlightIntent,
+)
+
+from monitoring.uss_qualifier.scenarios.astm.utm import DownUSS
+from monitoring.uss_qualifier.scenarios.astm.utm.test_steps import (
+    OpIntentValidator,
+    set_uss_down,
+    set_uss_available,
+)
+from monitoring.uss_qualifier.scenarios.flight_planning.test_steps import (
+    submit_flight_intent,
+)
+from monitoring.uss_qualifier.suites.suite import ExecutionContext
+
+
+class DownUSSEqualPriorityNotPermitted(DownUSS):
+    flight_2_planned_vol_A: FlightIntent
+
+    def _parse_flight_intents(self, flight_intents: Dict[str, FlightIntent]) -> None:
+        try:
+            self.flight_2_planned_vol_A = flight_intents["flight_2_planned_vol_A"]
+
+            assert (
+                self.flight_2_planned_vol_A.request.operational_intent.state
+                == OperationalIntentState.Accepted
+            ), "flight_2_planned_vol_A must have state Accepted"
+
+        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 activated flight managed by down USS"
+        )
+        oi_ref = self._plan_flight_conflict_activated()
+        self.end_test_case()
+
+        self.begin_test_case(
+            "Plan flight in conflict with nonconforming flight managed by down USS"
+        )
+        oi_ref = self._plan_flight_conflict_nonconforming(oi_ref)
+        self.end_test_case()
+
+        self.begin_test_case(
+            "Plan flight in conflict with contingent flight managed by down USS"
+        )
+        self._plan_flight_conflict_contingent(oi_ref)
+        self.end_test_case()
+
+        self.end_test_scenario()
+
+    def _plan_flight_conflict_activated(self) -> OperationalIntentReference:
+
+        # Virtual USS creates conflicting operational intent test step
+        oi_ref = self._put_conflicting_op_intent_step(
+            self.flight_2_planned_vol_A, OperationalIntentState.Accepted
+        )
+
+        # Virtual USS activates conflicting operational intent test step
+        oi_ref = self._put_conflicting_op_intent_step(
+            self.flight_2_planned_vol_A, OperationalIntentState.Activated, oi_ref
+        )
+
+        # 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 high-priority flight 2 test step
+        with OpIntentValidator(
+            self,
+            self.tested_uss,
+            self.dss,
+            "Validate high-priority flight 2 not shared",
+            self._intents_extent,
+        ) as validator:
+            submit_flight_intent(
+                self,
+                "Tested USS attempts to plan high-priority flight 2",
+                "Incorrectly planned",
+                {
+                    InjectFlightResponseResult.Rejected,
+                    InjectFlightResponseResult.ConflictWithFlight,
+                },
+                {
+                    InjectFlightResponseResult.Failed: "Failure",
+                },
+                self.tested_uss,
+                self.flight_2_planned_vol_A.request,
+            )
+            validator.expect_not_shared()
+
+        # Restore virtual USS availability at DSS test step
+        set_uss_available(
+            self,
+            "Restore virtual USS availability at DSS",
+            self.dss,
+            self.uss_qualifier_sub,
+        )
+
+        return oi_ref
+
+    def _plan_flight_conflict_nonconforming(
+        self, oi_ref: OperationalIntentReference
+    ) -> OperationalIntentReference:
+
+        # Virtual USS transitions to Nonconforming conflicting operational intent test step
+        oi_ref = self._put_conflicting_op_intent_step(
+            self.flight_2_planned_vol_A, OperationalIntentState.Nonconforming, oi_ref
+        )
+
+        # 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 high-priority flight 2 test step
+        with OpIntentValidator(
+            self,
+            self.tested_uss,
+            self.dss,
+            "Validate high-priority flight 2 not shared",
+            self._intents_extent,
+        ) as validator:
+            submit_flight_intent(
+                self,
+                "Tested USS attempts to plan high-priority flight 2",
+                "Incorrectly planned",
+                {
+                    InjectFlightResponseResult.Rejected,
+                    InjectFlightResponseResult.ConflictWithFlight,
+                },
+                {
+                    InjectFlightResponseResult.Failed: "Failure",
+                },
+                self.tested_uss,
+                self.flight_2_planned_vol_A.request,
+            )
+            validator.expect_not_shared()
+
+        # Restore virtual USS availability at DSS test step
+        set_uss_available(
+            self,
+            "Restore virtual USS availability at DSS",
+            self.dss,
+            self.uss_qualifier_sub,
+        )
+
+        return oi_ref
+
+    def _plan_flight_conflict_contingent(self, oi_ref: OperationalIntentReference):
+
+        # Virtual USS transitions to Contingent conflicting operational intent test step
+        self._put_conflicting_op_intent_step(
+            self.flight_2_planned_vol_A, OperationalIntentState.Contingent, oi_ref
+        )
+
+        # 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 high-priority flight 2 test step
+        with OpIntentValidator(
+            self,
+            self.tested_uss,
+            self.dss,
+            "Validate high-priority flight 2 not shared",
+            self._intents_extent,
+        ) as validator:
+            submit_flight_intent(
+                self,
+                "Tested USS attempts to plan high-priority flight 2",
+                "Incorrectly planned",
+                {
+                    InjectFlightResponseResult.Rejected,
+                    InjectFlightResponseResult.ConflictWithFlight,
+                },
+                {
+                    InjectFlightResponseResult.Failed: "Failure",
+                },
+                self.tested_uss,
+                self.flight_2_planned_vol_A.request,
+            )
+            validator.expect_not_shared()
diff --git a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
index 4c49a431c3..c386c384ee 100644
--- a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
+++ b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.md
@@ -17,7 +17,9 @@
     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. 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))
+8. Action generator: [`action_generators.flight_planning.FlightPlannerCombinations`](../../../action_generators/flight_planning/planner_combinations.py)
+    1. Scenario: [Off-Nominal planning: down USS with equal priority conflicts not permitted](../../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md) ([`scenarios.astm.utm.DownUSSEqualPriorityNotPermitted`](../../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.py))
+9. 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)
 
@@ -29,15 +31,15 @@
     <th><a href="../../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="23" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="24" 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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -84,6 +86,11 @@
     <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">SCD0010</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
+  </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -153,12 +160,12 @@
   <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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>
diff --git a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
index 99e1f60fe4..9f683bdcbe 100644
--- a/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
+++ b/monitoring/uss_qualifier/suites/astm/utm/f3548_21.yaml
@@ -145,6 +145,28 @@ 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:
+          # TODO: ability for this scenario to be skipped
+          scenario_type: scenarios.astm.utm.DownUSSEqualPriorityNotPermitted
+          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 475cae5788..d9d4233d56 100644
--- a/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
+++ b/monitoring/uss_qualifier/suites/faa/uft/message_signing.md
@@ -18,15 +18,15 @@
     <th><a href="../../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="23" style="vertical-align:top;"><a href="../../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="24" 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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
   </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -73,6 +73,11 @@
     <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">SCD0010</a></td>
+    <td>Implemented</td>
+    <td><a href="../../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
+  </tr>
   <tr>
     <td><a href="../../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -142,12 +147,12 @@
   <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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>
diff --git a/monitoring/uss_qualifier/suites/uspace/flight_auth.md b/monitoring/uss_qualifier/suites/uspace/flight_auth.md
index 1a677d1cd7..5395733f8b 100644
--- a/monitoring/uss_qualifier/suites/uspace/flight_auth.md
+++ b/monitoring/uss_qualifier/suites/uspace/flight_auth.md
@@ -19,15 +19,15 @@
     <th><a href="../README.md#checked-in">Checked in</a></th>
   </tr>
   <tr>
-    <td rowspan="23" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="24" 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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -74,6 +74,11 @@
     <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">SCD0010</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
+  </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -143,12 +148,12 @@
   <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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>
diff --git a/monitoring/uss_qualifier/suites/uspace/required_services.md b/monitoring/uss_qualifier/suites/uspace/required_services.md
index d1cfdf0887..265b6f557f 100644
--- a/monitoring/uss_qualifier/suites/uspace/required_services.md
+++ b/monitoring/uss_qualifier/suites/uspace/required_services.md
@@ -449,15 +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="23" style="vertical-align:top;"><a href="../../requirements/astm/f3548/v21.md">astm<br>.f3548<br>.v21</a></td>
+    <td rowspan="24" 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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss.md">Off-Nominal planning: down USS</a><br><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
   </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">DSS0300</a></td>
@@ -504,6 +504,11 @@
     <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">SCD0010</a></td>
+    <td>Implemented</td>
+    <td><a href="../../scenarios/astm/utm/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</a></td>
+  </tr>
   <tr>
     <td><a href="../../requirements/astm/f3548/v21.md">SCD0015</a></td>
     <td>Implemented</td>
@@ -573,12 +578,12 @@
   <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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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/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>
+    <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/off_nominal_planning/down_uss_equal_priority_not_permitted.md">Off-Nominal planning: down USS with equal priority conflicts not permitted</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>