What happened
During the initial climb phase of flight, the pilot reported experiencing a noticeable vibration within the aircraft. Despite efforts to locate the source of the disturbance, the pilot was unable to identify the specific cause. Consequently, the decision was made to execute a precautionary landing with the landing gear retracted on the remaining runway.
The investigation
A post-accident examination of the aircraft revealed that the stick shaker system had been activated. This activation was traced to an electrical problem located in the area of the left engine nacelle. However, investigators were unable to determine the exact nature or root cause of this electrical issue because a ground fire had occurred in that specific area, obscuring critical evidence.
Findings
The primary contributing factor was the activation of the stick shaker system due to an electrical fault in the left engine nacelle. The inability to pinpoint the exact cause of the electrical problem was directly attributed to the damage caused by the subsequent ground fire.