Sequence of Events
The flight was conducted in a valley while the pilot tracked a power line. At a point along the route, the pilot executed a 180-degree turn. Upon completing the turn, he applied full power to climb out of the valley. However, the engine would not produce full power. As the pilot maneuvered for an emergency landing, the airplane collided with trees.
Post-Accident Examination
Examination of the airplane at the accident site disclosed that fuel was present in both fuel tanks, the gascolator, and the carburetor. Both magnetos produced ignition sparks when rotated. The engine examination failed to disclose a mechanical malfunction or component failure.
Weather Conditions
A review of current weather data disclosed that conditions were favorable for the formation of carburetor ice.