Helmet,
Yes I can remember the specifics.....
All but one BK I have flown were two pilot so I don't think the autopilot is the problem.
In every occurance it was preceded by turbulence. If you react fast enough, you can counter the effect.
I originally thought it was a SPAS problem, but can't bring myself to blame it as I basically have no idea.
I havn't had a BK do it now for years as I really do believe that you can predict the reaction and put in the controlling inputs to reduce it well in advance, although I have to admit that the input is larger than normal.
Oogle,
Honestly, I think it is a BK issue as apposed to an autopilot one. I have only ever flown one with an autopilot, didn't have any probs with it but I only got to drive it for a short time. I might have to amend my comment on not experienceing it in B2's, now that I think of it, the early occurences may well have been in a B2. The CF story puts that one to rest anyway.
Cheers