Preflight Observation
During preflight procedures, the pilot discovered that the mixture control was stuck fully open. Despite this anomaly, the pilot decided to proceed with the flight, believing it did not affect the airworthiness of the airplane.
In-Flight Power Loss
Approximately 20 minutes after departure, the airplane experienced a partial loss of engine power. The pilot declared an emergency and requested assistance from Columbia Tower. The engine subsequently regained power, and the pilot opted to return to the departure airport.
Emergency Landing
On final approach, the engine suffered a complete loss of power. The pilot executed an emergency landing in a field. The landing was without incident, but shortly after touchdown, the pilot observed flames exiting the engine cowling.
Fire and Destruction
Attempts by the pilot to extinguish the fire using the onboard fire extinguisher were unsuccessful. The airplane was ultimately destroyed by the fire.
Post-Accident Examination
Examination of the carburetor revealed that the mixture control linkage was corroded and did not move freely. Further inspection found that an incorrect bolt had been installed for the mixture control linkage.