Dash 8-400
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Became Reoriented
Aircraft; Human Factors
Aircraft experienced an uncommanded roll during initial descent after requiring more than the usual amount of aileron trim to maintain wings level during cruise. I did not notice anything abnormal during the pre-flight control check or notice any deflection of spoilers on the PFCS during takeoff roll. Follow the new guidelines set out for the Q400 as a result of this incident.
Q400 Captain experienced an uncommanded roll during initial descent after requiring more than the usual amount of aileron trim to maintain wings level during cruise.