What happened
The aircraft was in the climb phase, reaching approximately 9,000 feet above ground level, following its departure from the origin airport. During this ascent, the engine suffered a complete loss of power. The pilot immediately attempted to restart the engine but was unable to restore operation. Consequently, the pilot initiated a forced landing procedure and touched down safely north of the departure airport.
The investigation
A post-accident inspection of the aircraft revealed significant internal engine damage. Investigators identified a hole in the engine crankcase located behind the number 2 cylinder. Additionally, the number 1 piston pin had separated at its midpoint. Further examination of the engine components showed that the number 1 connecting rod bushing was fragmented within the oil sump.
Findings
The technical analysis determined that the number 1 piston pin failed due to fatigue. This failure contributed to the separation of the pin and the subsequent damage to the crankcase and other internal components. The fragmentation of the connecting rod bushing in the oil sump confirmed the severity of the mechanical breakdown.
Safety message
Regular inspection of engine components for signs of fatigue is critical to preventing in-flight power loss.