Citationjet (C525/C526) - CJ I / II / III / IV
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Multiengine
Flight Crew Last 90 Days 60; Flight Crew Total 4400; Flight Crew Type 150
Human-Machine Interface; Troubleshooting; Workload
Aircraft Equipment Problem Critical; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Loss Of Aircraft Control
Flight Crew Overcame Equipment Problem; Flight Crew Regained Aircraft Control; Flight Crew Became Reoriented
Aircraft
An uncommanded roll to the right caused a deviation from the lateral course. I disconnected the autopilot via the control yoke disconnect button. I still had to physically overcome the control pressure so I also pulled the trim circuit breaker in case it was a factor. This did not change the control pressure. I used physical force to level the wings and turned the aileron trim which was very stiff and this abruptly changed the control pressure. I was able to hand fly and coordinate the rest of the procedure with ATC. Once in visual conditions I tried to see if the autopilot would work and it started a turn to the right again. I disconnected without any issue and hand flew the rest of the flight. Once on the ground I called ZZZ1 [Tracon] to ensure they were aware of my conditions and make sure no further actions were needed with their involvement.
A CE 525 Pilot reported an autopilot malfunction caused the aircraft to roll to the right; resulting in a temporary loss of control.