Accident
During the sixth flight of the day, while engaged in seeding a rice field, the engine of the airplane began to lose power. The pilot executed an emergency landing in an adjacent rice field that was flooded and had muddy conditions. During the landing rollout, the main landing gear wheels dug into the mud, causing the airplane to nose over.
Engine Examination
Following the accident, an examination of the engine was conducted. The inspection revealed that the number 3 cylinder exhaust valve area had a crack that extended from the rocker shaft to the push rod boss area. No further anomalies were observed with the engine beyond this crack.
Conclusion
The investigation into the engine power loss identified a crack in the exhaust valve area of cylinder 3. The emergency landing in the flooded, muddy rice field resulted in the main landing gear digging into the mud, leading to the nose-over. No additional issues were found with the engine.