Un-commanded roll to the right in an Aztec.

[emoshkovich]

Yesterday, returning from a dinner flight, at 4500ft on autopilot with GPS roll steering, I noticed that the airplane started drifting off to the right and getting away from the flight director. The airplane has a KFC-200 autopilot and is a 1980 Turbo F model. When I disconnected the autopilot the aircraft tried to roll to the right when hands off. I forced it level, with some effort. Immediately pulled the autopilot and the electric trim brakers. That did not help. I had to keep quite a significant left aileron force to keep it level. Landed without an incident and the controls became free and symmetric. On outside inspection nothing irregular was noted. No control surface problems, no cowl flap issues, etc.

Talking to my avionics shop they are suggesting that this is a roll servo failure. If it is, how is it that once the breakers were pulled there was still a significant left aileron force required to keep the airplane upright? Could something have been jammed?

Any ideas? Suggestions?

Thanks,

Emil

 

[emoshkovich]