@lawson-stone No reason to feel bad.   There is another forum post in here that is directly related to this, that I have spent the last few hours diagnosing.  The crash is caused by the libradio.plugin that ships with the aircraft. It makes a threading call that X-Plane 12.4 now strictly enforces, and the sim kills it on the spot.  (I'm assuming this began after one of the last few 12.4 updates?) To fix the crash: 1. Navigate to your C23 installation folder: X-Plane 12/Aircraft/X-A