Hello,   meanwhile I solved this Problem on my own. I had to install the SimConnect.msi, which can be found at Prepar3D/redist/Interface/fsx-sp2-xpack/retail/lib Folder.   Once installed everything works fine with each F-14 model.  Another nice fact is, that now I can use my Tobii Eyetracking device properly.   Happy flying!   Karsten