Accident Overview
A witness located approximately two miles from the accident site reported hearing an approaching airplane. The witness described the engine as "sputtering, like it was missing." The witness did not see the airplane but heard a loud "pop." Subsequently, the witness went to a clearing and observed a fire on the mountainside. The witness noted that the sky was overcast and the mountaintops were obscured. The point of impact was estimated to be 500 feet below the overcast.
Engine Examination
Following recovery of the wreckage, the engine was disassembled and examined. No anomalies were noted. Camshaft and crankshaft continuity was confirmed, and all connecting rods were attached. The carburetor, which had separated from the engine, was examined and found to have an empty bowl and a closed throttle valve. Both the engine-driven and auxiliary fuel pumps were destroyed by fire.
Carburetor Icing Conditions
The Carburetor Icing Probability Chart was consulted. The temperature and dew point recorded at the nearest weather reporting station, located 37 miles south of the accident site, were conducive to "serious icing at cruise power." Additionally, the temperatures and dew points recorded at the point of departure and destination were conducive to "serious icing at glide power."