http://www.youtube.com/watch?v=8dobyAmeeOs&feature=related

I just read through all 666 comments. Here is the one I like best:

"It looks to me like the pilot perfomed abrupt maneuvers and encountered a condition known as servo transparency (AKA jack stall) where the hydraulic servos on the controls become overloaded due to abrupt and large control inputs. If not corrected for properly, the controls become completely locked."

Yes, this ship did come from the states and I was one of the few people responsible for bringing it to Russia.

I don't believe the pilot who died was "hot dogging it", nor that it was a "loss of horizon" as described by some supposedly high-time TwinStar pilots. so I tend to believe the "jack stall" as originally described to me by Pete Riedl, Robinson helicopter chief of engineering.