What was found
DURING FLIGHT, THE FLIGHT CREW REPORTED THAT THE AILERONS LOCKED IN STRAIGHT AND LEVEL FLIGHT, FOLLOWED BY AILERON MIS-TRIM. THE CREW HAD TO FORCE THE AILERONS TO GET AUTO PILOT TO DISENGAGE. DURING APPROACH, THE AILERONS LOCKED AGAIN BUT THE CREW WAS ABLE TO FREE THEM WITH FORCE. THE AIRCRAFT THEN LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AILERON CONTROL SYSTEM AND FOUND NO DEFECTS. THE LEFT AND RIGHT AILERON PCA'S WERE THEN REPLACED AND THE AIRCRAFT WAS TEST FLOWN WITH NO FURTHER DEFECTS NOTED. RT AILERON PCA INFORMATION: P/N: 418800-1007, S/N: 1987AB, TSN: 19803.35, CSN: 1900, TSR: 2154.