Incident Description
While descending through 3,000 feet MSL, the aircraft experienced a partial loss of engine power. The pilot, who had accumulated 11,000 flight hours, reported that the engine "ran rough for about 5 seconds, then went to 1,500 rpm." In response, the pilot executed a forced landing into a nearby hay field.
Post-Accident Examination
Following the incident, engine continuity, compression, and magnetos were checked and verified to be functioning properly. The carburetor heat valve was found intact; however, its travel was partial due to the housing sliding in the clamp. The FAA inspector was unable to verify whether the fuel system was functional from the tank to the engine because the fuel had been removed from the aircraft.
Investigation Findings
Maintenance records were reviewed, and no anomalies were noted. According to the records, the most recent annual inspection had been completed on July 14, 2003. Ultimately, the reason for the loss of engine power was not determined.