What happened
The aircraft was involved in a forced landing off the airport due to a loss of power. During the incident, the airframe collided with two fences before coming to rest. Prior to the complete engine failure, the pilot observed a loss of oil pressure.
The investigation
A post-accident inspection of the engine revealed an internal mechanical failure. Specifically, the connecting rod bolt for engine number 2 had failed due to fatigue. Examination showed that approximately 40 percent of the bolt's diameter had fractured from fatigue, with the remainder failing in tension. At the time of the incident, the engine oil supply was full, and the total time on the engine was recorded at 3640.63 hours.
Findings
The primary factor leading to the accident was the internal failure of the engine. Contributing to this was the connecting rod bolt for engine number 2 failing in fatigue. The pilot had noted an oil pressure loss prior to the engine failure, although the oil supply was full.