Incident Overview
During arrival to the destination airport, the pilot reported hearing a loud bang, after which the aircraft began rolling to the right. The pilot stated that he was unable to control the roll with the ailerons. In response, he reduced power on the left engine and applied left rudder. This allowed the crew to maintain directional control and land safely.
Post-Landing Findings
After landing, examination revealed that the left aileron was bent at the second hinge point. An investigation determined that on February 20, 1984, the screws on the outboard hinge of the left aileron had been improperly installed. This improper installation allowed the outboard section of the aileron to come loose during flight.
Investigation Result
The investigation concluded that the screws on the outboard hinge of the left aileron were not correctly installed on February 20, 1984, leading to the detachment of the outboard aileron section.