Flight and Descent
A pilot operating a flight in instrument meteorological conditions (IMC) at 9,000 feet mean sea level (MSL) noticed a loss of airspeed indications. The pilot requested and received clearance to descend. During the descent, the pilot decided to divert to a nearby airport and received vectors from air traffic control.
Loss of Engine Response
As the pilot attempted to level off, there was no response to the engine controls. The aircraft could not glide to an airport, forcing the pilot to land in a wooded area. During the landing, the aircraft collided with trees on steep terrain.
Investigation Findings
An investigation determined that the surface temperature was 50°F and the dew point was 38°F, indicating that the temperature at 9,000 feet would have been at or near freezing. According to icing probability charts, carburetor icing conditions were probable during the descent from 9,000 to 3,000 feet. Additionally, water was found in the gascolator; no other pre-impact problems were identified.