The whole problem is that planes can only crash on terrain. In the screenshot you can see how a bomber can't to the surface of the terrain cause is stuck between wind traps!
Indeed, I ahd this a while ago, itll bounce up and down very quickly ina small space, causign slight damage untill it or the windgen dies which could be several minutes, while it continues to spin.
This issue has been around for quite a long time..whenever there's a solid area filled in with hitspheres, an aircraft sits there in an amusing fashion. Particularly noticable in SimBase when a fighter or bomber crashes above a large field of metal makers.