Sequence of Events
A pilot descended from 1500 feet to 500 feet above ground level (AGL) to perform a low pass over his parents' ranch. Prior to reducing power for the descent, he did not apply carburetor heat. As he leveled off, he advanced the mixture control to full rich and advanced the throttle. The engine then lost power.
Forced Landing and Post-Impact
Due to the proximity of terrain, no engine restart was attempted. The pilot executed a forced landing in an open field. During the rollout, the nose wheel struck a boulder and was sheared off, causing the airplane to nose over.
Examination and Testing
Post-accident examination and tests disclosed no discrepancies with the carburetor, oil screen, spark plugs, fuel, or oil. The engine was subsequently functionally tested and operated satisfactorily.