Event Description
After a flight concluded, the aircraft taxied to the arrival gate. The flight attendant attempted to open the main passenger cabin door but could not. The first officer also tried and failed to open the door, which was jammed in the closed position. A mechanic was summoned and entered the airplane through the galley service door. From inside the passenger cabin, the mechanic manipulated the cabin door opening lever, successfully opening the door.
Findings
Subsequent examination by maintenance personnel revealed that the door was out of adjustment (rig) and that some internal components were inoperative. Under certain conditions, these anomalies rendered the door dysfunctional. The investigation noted that neither the operator's maintenance program nor the manufacturer's response to the repeated jamming events had adequately resolved the recurring discrepancy.