Accident Narrative
During a sightseeing flight, a pilot and a passenger were flying when the pilot decided to glide across a valley. He enriched the mixture to full rich, applied carburetor heat, and reduced engine power. As the aircraft crossed the valley, the pilot attempted to level off by advancing the throttle, but the engine failed to respond. With no engine power, the pilot was forced to land in hilly terrain. The aircraft struck a fence during the landing and nosed over, coming to rest on its nose.
Investigation Findings
An inspection of the aircraft after the accident did not reveal any mechanical reason for the engine failure. A carburetor icing probability chart was also evaluated, and it indicated that carburetor icing was not a probable cause. The investigation did not determine any other reason for the engine's lack of response.