Accident Sequence
Before the flight, the pilot was observed scraping ice from the wings. The engine started without difficulty, and the pilot taxied to runway 28 for a night takeoff. During initial climb, after passing the runway end, the aircraft entered a left turn. It then suddenly descended and struck snow-covered terrain. The impact heading was 140 degrees.
Aircraft Damage
The leading edges of both wings were flattened against the main spar, and the fuselage forward of the empennage was buckled.
Witness Statement
A witness reported that the engine "stalled" prior to the aircraft's descent.
Mechanical Findings
Examination of the fuel injector revealed an interior leak around the mixture control bushing seal, which allowed unmetered fuel to enter the engine. No other mechanical part failures or malfunctions were found.
Pilot Reports
Two acquaintances of the pilot stated that he had previously reported a fuel injector problem or a fuel mixture problem.
Additional Information
The airport elevation was 5900 feet.