Incident Overview
A pilot experienced a loss of engine power while flying during the cruise phase of flight. In response, the pilot applied carburetor heat. The engine then operated normally while the carb heat was engaged.
Sequence of Events
When the carb heat was turned off, the engine again began to run rough. The pilot reactivated the carb heat, and the engine resumed normal operation. This sequence of turning carb heat on and off was repeated several times. Despite the engine running normally only with carb heat on, the pilot ultimately chose to continue flying with the carb heat off. Shortly thereafter, the aircraft experienced a total loss of engine power.
An emergency landing was attempted in a field. During the landing, the aircraft collided with trees located at the far end of the field.