diff --git a/src/blackmisc/simulation/ownaircraftprovider.cpp b/src/blackmisc/simulation/ownaircraftprovider.cpp
index e77a6f288c..0c2c28d212 100644
--- a/src/blackmisc/simulation/ownaircraftprovider.cpp
+++ b/src/blackmisc/simulation/ownaircraftprovider.cpp
@@ -32,6 +32,18 @@ namespace BlackMisc::Simulation
         return this->provider()->getOwnCallsign();
     }
 
+    CComSystem COwnAircraftAware::getOwnComSystem(CComSystem::ComUnit unit) const
+    {
+        Q_ASSERT_X(this->provider(), Q_FUNC_INFO, "No object available");
+        return this->provider()->getOwnComSystem(unit);
+    }
+
+    CTransponder COwnAircraftAware::getOwnTransponder() const
+    {
+        Q_ASSERT_X(this->provider(), Q_FUNC_INFO, "No object available");
+        return this->provider()->getOwnTransponder();
+    }
+
     CCoordinateGeodetic COwnAircraftAware::getOwnAircraftPosition() const
     {
         Q_ASSERT_X(this->provider(), Q_FUNC_INFO, "No object available");
diff --git a/src/blackmisc/simulation/ownaircraftprovider.h b/src/blackmisc/simulation/ownaircraftprovider.h
index 5c01f2f7a3..dd0411ae8a 100644
--- a/src/blackmisc/simulation/ownaircraftprovider.h
+++ b/src/blackmisc/simulation/ownaircraftprovider.h
@@ -131,6 +131,12 @@ namespace BlackMisc
             //! \copydoc IOwnAircraftProvider::getOwnCallsign
             Aviation::CCallsign getOwnCallsign() const;
 
+            //! \copydoc IOwnAircraftProvider::getOwnComSystem
+            Aviation::CComSystem getOwnComSystem(Aviation::CComSystem::ComUnit unit) const;
+
+            //! \copydoc IOwnAircraftProvider::getOwnTransponder
+            Aviation::CTransponder getOwnTransponder() const;
+
             //! \copydoc IOwnAircraftProvider::getOwnAircraftPosition
             BlackMisc::Geo::CCoordinateGeodetic getOwnAircraftPosition() const;
 
diff --git a/src/plugins/simulator/fs9/simulatorfs9.cpp b/src/plugins/simulator/fs9/simulatorfs9.cpp
index 35538f782c..ffd11f4fc2 100644
--- a/src/plugins/simulator/fs9/simulatorfs9.cpp
+++ b/src/plugins/simulator/fs9/simulatorfs9.cpp
@@ -417,11 +417,25 @@ namespace BlackSimPlugin::Fs9
         // To avoid jitters, I wait some update cylces to stabilize the values
         if (m_skipCockpitUpdateCycles < 1)
         {
-            this->updateCockpit(
-                simDataOwnAircraft.getCom1System(),
-                simDataOwnAircraft.getCom2System(),
-                simDataOwnAircraft.getTransponder(),
-                this->identifier());
+            const auto dontOverwrite = [](const CFrequency &from, const CFrequency &to) {
+                // don't overwrite 8.33 kHz frequencies
+                return CComSystem::isExclusiveWithin8_33kHzChannel(from) &&
+                       from.valueInteger(CFrequencyUnit::kHz()) / 10 == to.valueInteger(CFrequencyUnit::kHz()) / 10;
+            };
+            CComSystem com1 = simDataOwnAircraft.getCom1System();
+            CComSystem com2 = simDataOwnAircraft.getCom2System();
+            const CComSystem oldCom1 = getOwnComSystem(CComSystem::Com1);
+            const CComSystem oldCom2 = getOwnComSystem(CComSystem::Com2);
+            if (dontOverwrite(oldCom1.getFrequencyActive(), com1.getFrequencyActive()))
+                com1.setFrequencyActive(oldCom1.getFrequencyActive());
+            if (dontOverwrite(oldCom1.getFrequencyStandby(), com1.getFrequencyStandby()))
+                com1.setFrequencyStandby(oldCom1.getFrequencyStandby());
+            if (dontOverwrite(oldCom2.getFrequencyActive(), com2.getFrequencyActive()))
+                com2.setFrequencyActive(oldCom2.getFrequencyActive());
+            if (dontOverwrite(oldCom2.getFrequencyStandby(), com2.getFrequencyStandby()))
+                com2.setFrequencyStandby(oldCom2.getFrequencyStandby());
+
+            this->updateCockpit(com1, com2, simDataOwnAircraft.getTransponder(), this->identifier());
         }
         else
         {