Accident Overview
During cruise flight at approximately 700-800 feet above mean sea level, the engine experienced a gradual loss of power. The pilot attempted to correct the loss of power but was unsuccessful. While descending for a forced landing, the airplane collided with a tree, then struck the ground, and nosed over.
Post-Accident Examination
An FAA airworthiness inspector conducted a post-accident examination of the airplane. The mixture control at the fuel metering valve was found approximately halfway between the midrange and idle cutoff positions. The mixture control cable was discovered separated from the rod end; the rod end remained attached to the bellcrank (mixture) at the airbox assembly. Damage to approximately 11 threads at the end of the mixture cable was noted.
Maintenance Records and Statements
Maintenance records were reportedly destroyed in a fire. The inspection authorization (IA) mechanic who performed the last annual inspection stated to the FAA inspector that the aircraft owner had adjusted the mixture cable rod end to achieve the correct cushion. The IA reported that he checked the adjustment but failed to verify the security of the jam nut at the rod end. The owner stated that he did not adjust the engine controls in the engine compartment and believed the IA had adjusted them. The pilot is not a certificated mechanic.