Accident Details
During a pipeline patrol flight, the pilot experienced a loss of engine power while cruising at 500 feet. The engine began running rough, and the airplane could not sustain level flight. The pilot elected to perform a forced landing in a rice field. During the landing, the airplane struck a dike and the ground, resulting in damage to the aircraft.
Post-Accident Investigation
A post-accident investigation revealed that the number 3 exhaust valve had failed and was ingested into the engine, causing severe damage to the piston and cylinder. The investigation was unable to determine the root cause of the valve failure.
Conclusion
The airplane was damaged during the forced landing following the power loss attributed to mechanical failure. The specific reason for the exhaust valve failure remains undetermined.