What happened
During the climb phase of flight, the aircraft experienced a sudden and complete loss of engine power. The failure originated within the fifth cylinder, which resulted in the destruction of the piston and subsequent engine shutdown.
The investigation
Investigators examined the engine to determine the precise origin of the malfunction. The engine in question had undergone extensive modifications, and the impact of these changes on the unit's overall reliability had not been previously established. However, the damage sustained by the engine following the failure in cylinder five was so significant that the specific trigger for the initial malfunction could not be identified.