Incident Overview
A pilot reported that prior to a scheduled takeoff, he removed the left main landing gear wheel because its tire had a slow air leak. The pilot, who holds an airframe and powerplant mechanic certificate, indicated that after replacing the tube, he reinstalled the wheel on his airplane. During the maintenance, he did not properly secure the wheel’s retaining nut with a cotter pin.
Sequence of Events
During the subsequent takeoff roll, the attachment nut unscrewed, and the wheel separated from the axle and airplane. The pilot continued to fly around the area for about 30 minutes to burn off fuel. Upon landing, the airplane veered left off the runway and nosed over.
Damage Assessment
The accident resulted in damage to the aircraft structures, including broken wing ribs and a lift strut.
Probable Cause
The pilot's failure to properly secure the wheel’s retaining nut with a cotter pin during maintenance.