What happened
The aircraft was operating at a constant altitude during level cruise flight when it experienced a complete loss of engine power. Without propulsion, the pilot initiated an off-airport emergency landing procedure. The aircraft touched down in an open field but continued its momentum until it rolled out into a tree line at the far end of the landing area.
The investigation
A thorough on-scene inspection was conducted to determine the mechanical cause of the power loss. Investigators found that the connecting rod bolts for the number two cylinder had failed. This failure resulted in significant internal damage, including a hole in the top of the engine case located near the number two cylinder tappet position.
Findings
The engine involved in the accident had been overhauled approximately 21 years prior to the event. The failure of the connecting rod bolts indicates a mechanical breakdown that led to catastrophic engine failure. The incident highlights the risks associated with aging engine components, even after overhaul.