What was found
(CAN) PAX/CREW DOOR HANDLE LOCKING MECHANISM HARD TO OPERATE EXCEPT UPON ARRIVAL AT MAIN BASE. INSPECTING DOOR, FOUND PIN LOCK AND ITS SPRING FROM SAFETY LOCKING MECH TO BE MISSING. LOCKING MECH STOPS ACCIDENTAL OPERATION OF DOOR HANDLE INSIDE AC. RELEASE LEVER IS INSTALLED ON INSIDE OF DOOR BELOW INNER HANDLE. CABLE CONNECTS IT TO A LOCKING PIN WHICH ENGAGES IN OUTER HANDLE IF PIN LOCK BREAKS OR IS FORCED OUT OF CRANK, COMPRESSION SPRING EJECTS ITSELF AND PIN LOCK AWAY FROM AC AND THE DOOR CAN BE OPENED JUST BY ACTIVATING HANDLE. SUSPECT FORMATION OF ICE BETWEEN THE LOCKING PIN AND THE DOOR STRUCTURE TO RESTRAIN MOVEMENT OF PIN AND CAUSE A FAILURE OF LOCKING MECHANISM.