What happened
The pilot was engaged in banner towing operations along a beach when the aircraft's engine failed unexpectedly. Due to the loss of power, the pilot was forced to execute an emergency landing in the water just offshore from the beach. The pilot managed to escape the aircraft without sustaining any injuries. Following the incident, the surf destroyed the aircraft.
The investigation
An examination of the engine revealed that the number 3 cylinder had separated from the engine block. Investigators were unable to recover the cylinder for further analysis. Records indicated that the engine had accumulated approximately 900 hours since its last overhaul at the time of the accident.
Findings
The primary factor in this incident was the separation of the number 3 cylinder, which led directly to the loss of engine power. The subsequent destruction of the aircraft by surf conditions prevented a more detailed mechanical examination of the failed component.