The simplest solution is to acknowledge that the crash detection logic in FS (FS9, or FSX, or P3D, all versions) is totally useless and should be turned OFF.
There are way too many objects with unrealistically huge crash boxes, or invisible objects that still have crash boxes, etc... that trigger crashes when your aircraft really didn't touch anything or anybody, forcing you to restart the flight for nothing.
I don't remember the exact name of the option, but it should be quite explicit, somewhere in the general or realism section of the sim options.