What happened
While the aircraft was turning onto final approach at an altitude of approximately 750 to 800 feet, the engine lost power. In response to the power loss, the pilot applied carburetor heat; however, all attempts to restart the engine were unsuccessful.
The pilot attempted a forced landing in a field located just short of the runway. During this maneuver, the aircraft collided with a fence. The impact caused both wings to separate from the fuselage and resulted in the rupture of all fuel tanks.
The investigation
Post-crash examination of the engine and aircraft revealed that the carburetor contained uncontaminated fuel. Investigators found that the fuel tanks were clear of debris and the fuel vent system remained unobstructed. Furthermore, the engine was tested and operated for five minutes during the investigation with no evidence of mechanical failure or malfunction.
At the time of the accident, the ambient temperature was approximately 78 degrees F with a dew point of 76 degrees F. According to icing probability charts, these atmospheric conditions were conducive to carburetor ice formation.