diff --git a/Tools/autotest/arduplane.py b/Tools/autotest/arduplane.py
index cf94ae2c875c0..3dd362bed181b 100644
--- a/Tools/autotest/arduplane.py
+++ b/Tools/autotest/arduplane.py
@@ -6533,6 +6533,162 @@ def MAV_CMD_NAV_LOITER_TO_ALT(self):
         self.wait_current_waypoint(4)
         self.fly_home_land_and_disarm()
 
+    def VolzMission(self):
+        '''test Volz serially-connected servos in a mission'''
+        volz_motor_mask = ((1 << 0) | (1 << 1) | (1 << 3) | (1 << 8) | (1 << 9) | (1 << 11))
+        self.set_parameters({
+            'SERIAL5_PROTOCOL': 14,
+            'SERVO_VOLZ_MASK': volz_motor_mask,
+            'RTL_AUTOLAND': 2,
+
+            'SIM_VOLZ_ENA': 1,
+            'SIM_VOLZ_MASK': volz_motor_mask,
+        })
+        # defaults file not working?
+        self.set_parameters({
+            "SERVO2_REVERSED":  0,  # elevator
+
+            "SERVO9_FUNCTION": 4,
+
+            "SERVO10_FUNCTION": 19,  # elevator
+
+            "SERVO12_FUNCTION": 21,  # rudder
+            "SERVO12_REVERSED":  1,  # rudder
+
+        })
+        self.customise_SITL_commandline([
+            "--serial5=sim:volz",
+        ], model="plane-redundant",
+                                        )
+        self.wait_ready_to_arm()
+        self.arm_vehicle()
+        self.takeoff()
+        self.fly_home_land_and_disarm()
+
+    def Volz(self):
+        '''test Volz serially-connected'''
+        volz_motor_mask = ((1 << 0) | (1 << 1) | (1 << 3) | (1 << 8) | (1 << 9) | (1 << 11))
+        self.set_parameters({
+            'SERIAL5_PROTOCOL': 14,
+            'SERVO_VOLZ_MASK': volz_motor_mask,
+            'RTL_AUTOLAND': 2,
+
+            'SIM_VOLZ_ENA': 1,
+            'SIM_VOLZ_MASK': volz_motor_mask,
+        })
+        # defaults file not working?
+        self.set_parameters({
+            "SERVO2_REVERSED":  0,  # elevator
+
+            "SERVO9_FUNCTION": 4,
+
+            "SERVO10_FUNCTION": 19,  # elevator
+
+            "SERVO12_FUNCTION": 21,  # rudder
+            "SERVO12_REVERSED":  1,  # rudder
+
+        })
+        self.customise_SITL_commandline([
+            "--serial5=sim:volz",
+        ], model="plane-redundant",
+                                        )
+        self.wait_ready_to_arm()
+        self.takeoff()
+        self.change_mode('FBWA')
+        straight_and_level_text = "straight-and-level"
+        self.send_statustext(straight_and_level_text)
+        self.delay_sim_time(2)
+        self.progress("sticking servo with constant deflection")
+        self.set_rc(1, 1400)
+        self.change_mode('MANUAL')
+        self.delay_sim_time(0.5)
+        self.progress("Failing servo")
+        self.set_parameter('SIM_VOLZ_FMASK', 1)
+        self.change_mode('FBWA')
+        aileron_failed_text = "aileron has been failed"
+        self.send_statustext(aileron_failed_text)
+        self.delay_sim_time(5)
+        self.set_parameter('SIM_VOLZ_FMASK', 0)
+
+        log_filepath = self.current_onboard_log_filepath()
+        self.fly_home_land_and_disarm()
+
+        self.progress("Inspecting DFReader to ensure servo failure is recorded in the log")
+        dfreader = self.dfreader_for_path(log_filepath)
+        while True:
+            m = dfreader.recv_match(type=['MSG'])
+            if m is None:
+                raise NotAchievedException("Did not see straight_and_level_text")
+            if m.Message == "SRC=250/250:" + straight_and_level_text:
+                break
+
+        self.progress("Ensuring deflections are close to zero in straight-and-level flight")
+        chan1_good = False
+        chan9_good = False
+        while not (chan1_good and chan9_good):
+            m = dfreader.recv_match()
+            if m is None:
+                raise NotAchievedException("Did not see chan1 and chan9 as close-to-0")
+            if m.get_type() != 'CSRV':
+                continue
+            if m.Id == 0 and abs(m.Pos) < 3:
+                chan1_good = True
+            elif m.Id == 8 and abs(m.Pos) < 3:
+                chan9_good = True
+
+        while True:
+            m = dfreader.recv_match(type=['MSG'])
+            if m is None:
+                raise NotAchievedException("Did not see aileron_failed_text")
+            if m.Message == "SRC=250/250:" + aileron_failed_text:
+                break
+
+        self.progress("Checking servo9 is deflected")
+        while True:
+            # m = dfreader.recv_match(type=['CSRV'])
+            m = dfreader.recv_match()
+            if m is None:
+                raise NotAchievedException("Did not see chan9 deflection")
+            if m.get_type() != 'CSRV':
+                continue
+            if m.Id != 8:
+                continue
+            if m.Pos < 20:
+                continue
+            break
+
+        self.progress("Ensuring the vehicle stabilised with a single aileron")
+        while True:
+            m = dfreader.recv_match()
+            if m is None:
+                raise NotAchievedException("Did not see good attitude")
+            if m.get_type() != 'ATT':
+                continue
+            if abs(m.Roll) < 5:
+                break
+
+        self.progress("Ensure the roll integrator is wound up")
+        while True:
+            m = dfreader.recv_match()
+            if m is None:
+                raise NotAchievedException("Did not see wound-up roll integrator")
+            if m.get_type() != 'PIDR':
+                continue
+            if m.I > 5:
+                break
+
+        self.progress("Checking that aileron is stuck at some deflection")
+        while True:
+            m = dfreader.recv_match()
+            if m is None:
+                raise NotAchievedException("Did not see csrv Pos/PosCmd discrepency")
+            if m.get_type() != 'CSRV':
+                continue
+            if m.Id != 1:
+                continue
+            if abs(m.Pos - m.PosCmd) > 20:
+                break
+
     def tests(self):
         '''return list of all tests'''
         ret = []
@@ -6688,6 +6844,8 @@ def tests1b(self):
             self.MAV_CMD_EXTERNAL_WIND_ESTIMATE,
             self.GliderPullup,
             self.BadRollChannelDefined,
+            self.VolzMission,
+            self.Volz,
         ]
 
     def disabled_tests(self):