AAIB investigation to Saab 2000, G-LGNR
Reduction in aircraft controllability, near Manchester, 6 November 2015.
Summary:
The pilots observed that the aircraft was flying in an unusual attitude. Shortly afterwards a roll mistrim indication illuminated to indicate that there were untrimmed forces in the aileron system. The pilots disconnected the autopilot and recovered the aircraft to straight and level flight. The roll mistrim indication ceased but the EICAS indicated that both ailerons were deflected up. The pilots decided to action a checklist which involved pulling a handle to separate the left and right ailerons. They found that having pulled this handle, aircraft controllability was reduced. The aircraft landed safely from its subsequent approach
Download report: