Accident Overview
A pilot flying an agricultural spraying aircraft encountered an engine malfunction while returning from a spray run. The incident occurred after the pilot had completed the fourth spray load of the morning and was heading back for the next load.
Engine Malfunction
During the return flight, the engine began running rough and started to backfire. The pilot performed checks on the magnetos, propeller, and throttle lever, all of which appeared normal. Despite these checks, the engine continued to backfire, and the aircraft was unable to maintain altitude.
Forced Landing
Unable to sustain flight, the pilot decided to execute a forced landing in a rice field. After touchdown, the airplane nosed over and came to rest in an inverted position.
Post-Accident Examination
A certified mechanic examined the aircraft and engine after the incident. The inspection revealed no anomalies that would have prevented normal engine operation. The reason for the partial loss of engine power was undetermined.