diff --git a/docs/source/Support/bskReleaseNotes.rst b/docs/source/Support/bskReleaseNotes.rst
index 219ebb3b0f..69473b4fa4 100644
--- a/docs/source/Support/bskReleaseNotes.rst
+++ b/docs/source/Support/bskReleaseNotes.rst
@@ -32,6 +32,8 @@ Version |release|
 - Pinned python dependencies to avoid issues with new package versions.
 - Added a new github workflow job ``canary`` to routinely check the compatibility of latest python dependencies with python 3.13 on the latest mac-os.
 - Fixed a bug in :ref:`spiceInterface` where multiple instances of the module were not properly managing SPICE kernel references, leading to potential conflicts and data corruption.
+- Deprecated :ref:`SpacecraftSystem`.  It was never completed and we have other ways to connect spacecraft components
+
 
 Version 2.7.0 (April 20, 2025)
 ------------------------------
diff --git a/src/simulation/dynamics/HingedRigidBodies/_UnitTest/test_hingedRigidBodyStateEffector.py b/src/simulation/dynamics/HingedRigidBodies/_UnitTest/test_hingedRigidBodyStateEffector.py
index 0e5afbf800..cec5262328 100644
--- a/src/simulation/dynamics/HingedRigidBodies/_UnitTest/test_hingedRigidBodyStateEffector.py
+++ b/src/simulation/dynamics/HingedRigidBodies/_UnitTest/test_hingedRigidBodyStateEffector.py
@@ -39,6 +39,7 @@
 from Basilisk.simulation import extForceTorque
 from Basilisk.simulation import spacecraftSystem
 from Basilisk.architecture import messaging
+from Basilisk.utilities import deprecated
 
 # uncomment this line is this test is to be skipped in the global unit test run, adjust message as needed
 # @pytest.mark.skipif(conditionstring)
@@ -68,8 +69,10 @@ def test_hingedRigidBodyMotorTorque(show_plots, useScPlus):
     [testResults, testMessage] = hingedRigidBodyMotorTorque(show_plots, useScPlus)
     assert testResults < 1, testMessage
 
+
 def hingedRigidBodyGravity(show_plots):
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -300,6 +303,7 @@ def hingedRigidBodyNoGravity(show_plots):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -531,6 +535,7 @@ def hingedRigidBodyNoGravityDamping(show_plots):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -720,6 +725,7 @@ def hingedRigidBodyThetaSS(show_plots):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -912,6 +918,7 @@ def hingedRigidBodyFrequencyAmp(show_plots):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -1194,6 +1201,7 @@ def hingedRigidBodyMotorTorque(show_plots, useScPlus):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -1434,6 +1442,7 @@ def hingedRigidBodyLagrangVsBasilisk(show_plots):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -1877,10 +1886,10 @@ class boxAndWingParameters:
     d = 0
 
 if __name__ == "__main__":
-    # test_hingedRigidBodyGravity(True)
-    # test_hingedRigidBodyNoGravity(True)
-    # test_hingedRigidBodyNoGravityDamping(True)
-    # test_hingedRigidBodyThetaSS(True)
-    # test_hingedRigidBodyFrequencyAmp(True)
-    # test_hingedRigidBodyMotorTorque(True, True)
-    hingedRigidBodyLagrangVsBasilisk(True)
+    hingedRigidBodyGravity(False)
+    # hingedRigidBodyNoGravity(True)
+    # hingedRigidBodyNoGravityDamping(True)
+    # hingedRigidBodyThetaSS(True)
+    # hingedRigidBodyFrequencyAmp(True)
+    # hingedRigidBodyMotorTorque(True, True)
+    # hingedRigidBodyLagrangVsBasilisk(True)
diff --git a/src/simulation/dynamics/dualHingedRigidBodies/_UnitTest/test_dualhingedRigidBodyStateEffector.py b/src/simulation/dynamics/dualHingedRigidBodies/_UnitTest/test_dualhingedRigidBodyStateEffector.py
index 231e51673e..064a8bc91a 100644
--- a/src/simulation/dynamics/dualHingedRigidBodies/_UnitTest/test_dualhingedRigidBodyStateEffector.py
+++ b/src/simulation/dynamics/dualHingedRigidBodies/_UnitTest/test_dualhingedRigidBodyStateEffector.py
@@ -36,6 +36,7 @@
 from Basilisk.utilities import pythonVariableLogger
 from Basilisk.simulation import spacecraftSystem
 from Basilisk.architecture import messaging
+from Basilisk.utilities import deprecated
 
 @pytest.mark.parametrize("useFlag, testCase", [
     (False, 'NoGravity'),
@@ -60,16 +61,16 @@ def dualHingedRigidBodyTest(show_plots, useFlag, testCase):
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
-    
+
     scObject = spacecraft.Spacecraft()
     scObject.ModelTag = "spacecraftBody"
-    
+
     unitTaskName = "unitTask"  # arbitrary name (don't change)
     unitProcessName = "TestProcess"  # arbitrary name (don't change)
-    
+
     #   Create a sim module as an empty container
     unitTestSim = SimulationBaseClass.SimBaseClass()
-    
+
     # Create test thread
     testProcessRate = macros.sec2nano(0.0001)  # update process rate update time
     testProc = unitTestSim.CreateNewProcess(unitProcessName)
@@ -271,6 +272,7 @@ def dualHingedRigidBodyMotorTorque(show_plots, useScPlus):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
diff --git a/src/simulation/dynamics/spacecraftSystem/_UnitTest/test_multiSpacecraft.py b/src/simulation/dynamics/spacecraftSystem/_UnitTest/test_multiSpacecraft.py
index 1cee31ca92..5eee35725b 100644
--- a/src/simulation/dynamics/spacecraftSystem/_UnitTest/test_multiSpacecraft.py
+++ b/src/simulation/dynamics/spacecraftSystem/_UnitTest/test_multiSpacecraft.py
@@ -33,6 +33,7 @@
 from Basilisk.utilities import pythonVariableLogger
 from Basilisk.simulation import gravityEffector
 from Basilisk.simulation import hingedRigidBodyStateEffector
+from Basilisk.utilities import deprecated
 
 
 def addTimeColumn(time, data):
@@ -66,6 +67,7 @@ def SCConnected(show_plots):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
@@ -343,6 +345,7 @@ def SCConnectedAndUnconnected(show_plots):
     # the mrp_steering_tracking() function will not be shown unless the
     # --fulltrace command line option is specified.
     __tracebackhide__ = True
+    deprecated.filterwarnings("ignore", "SpacecraftSystem.SpacecraftSystem")
 
     testFailCount = 0  # zero unit test result counter
     testMessages = []  # create empty list to store test log messages
diff --git a/src/simulation/dynamics/spacecraftSystem/spacecraftSystem.i b/src/simulation/dynamics/spacecraftSystem/spacecraftSystem.i
index 81b03eb421..8ac8f65ae1 100755
--- a/src/simulation/dynamics/spacecraftSystem/spacecraftSystem.i
+++ b/src/simulation/dynamics/spacecraftSystem/spacecraftSystem.i
@@ -31,6 +31,9 @@ from Basilisk.simulation.gravityEffector import GravBodyVector
 %include "swig_eigen.i"
 %include "swig_conly_data.i"
 
+%include "swig_deprecated.i"
+%deprecated_function(SpacecraftSystem::SpacecraftSystem, "2026/05/25", "Move to regular spacecraft class and connect with constraintDynamicEffector.")
+
 %include "sys_model.i"
 %include "../_GeneralModuleFiles/dynParamManager.i"
 %include "../_GeneralModuleFiles/dynamicObject.h"