What happened
The accident occurred while a student pilot was conducting practice maneuvers at an altitude of approximately 3000 feet. During this phase of flight, the aircraft's engine suddenly failed. In response to the loss of power, the pilot executed a forced landing in a nearby field. The terrain conditions played a significant role in the extent of the damage; specifically, tall grass in the landing area contributed to the failure of the landing gear. As a result, the aircraft sustained substantial damage during the landing roll.
The investigation
A detailed examination was conducted to determine the mechanical cause of the engine failure. An NTSB metallurgist report provided critical insights into the internal components of the engine. The analysis revealed that the connecting rod for number one cylinder had broken. Further inspection of the failed component showed clear evidence of metal fatigue, indicating a progressive structural failure rather than an immediate catastrophic break from overload.
Findings
The investigation highlighted several key factors contributing to the accident sequence. The primary mechanical issue was the metal fatigue observed in the connecting rod of the number one cylinder. This internal engine failure led directly to the loss of power during the maneuvering phase. Additionally, the operational history of the engine was noted; the engine had accumulated only 35 hours of operating time since its last major overhaul. The combination of the mechanical failure and the environmental conditions of the forced landing site resulted in the substantial damage to the airframe.