What happened
The accident occurred during the landing phase of flight. The pilot was approaching the runway when he crossed over power lines located near the approach end of the runway. Upon crossing these obstacles, the aircraft touched down at a high rate of descent.
After touchdown, the pilot applied the brakes to reduce speed. However, the aircraft began to skid onto the grass adjacent to the paved surface. The pilot did not realize the wheels were sliding on the grass until the aircraft reached a bare patch of ground. At that point, the wheels dug into the earth, causing the aircraft to flip over.
The investigation
The investigation relied primarily on the pilot's account of the event. No mechanical failure or pre-accident anomaly was identified that would have precluded normal operation. The primary factor was the high rate of descent and subsequent loss of directional control on the grass surface.