Is that an official fix? :joystick:
1) I'm not sure 'how much damaged' exactly, it just lost its tail.
2) In my experience, no. I think complete tail cut causes it.
3) Of course it can fly without a tail. It seems that the problem is Ka-50's DM, not its FM.
This is track file link
http://blogattach.naver.com/07921ba8bde5e33f11f39da49b770d7cd88f759672/20160722_4_blogfile/cougar2001_1469138076046_dnhhAt_trk/server-20160719-230824.trk?type=attachment
Check the part of right after the humvee crews disembarked, my chopper(I was the host) hit the building and lost its tail. You'll see my chopper was still alive but disappeared in F10 map.