diff --git a/src/plugins/simulator/fscommon/fsuipcimpl.cpp b/src/plugins/simulator/fscommon/fsuipcimpl.cpp
index b5269d470..9733bdd93 100644
--- a/src/plugins/simulator/fscommon/fsuipcimpl.cpp
+++ b/src/plugins/simulator/fscommon/fsuipcimpl.cpp
@@ -521,7 +521,7 @@ namespace BlackSimPlugin
                     situation.setAltitude(altitude);
                     situation.setPressureAltitude(pressureAltitude);
                     aircraft.setSituation(situation);
-
+                    aircraft.setCG(altitude-groundAltitude); // calculate the CG
                 } // situation
 
                 // model