Accident Overview
A commercial pilot flying over mountainous terrain encountered a rough running engine with a slight reduction in rpm. The pilot applied full carburetor heat, after which the engine experienced a rapid loss of power, resulting in a loss of altitude. Unable to restore adequate engine power to maintain level flight, the pilot selected an uphill portion of a mountainside as a forced landing site.
Landing and Damage
During touchdown on soft tundra-covered terrain, the left main landing gear collapsed, and the left wing struck the ground. The airplane sustained structural damage to the left wing and fuselage.
Weather Conditions
The pilot reported that weather conditions at the time of the accident included visibility of 10 statute miles in light rain and mist, clouds and sky condition of 3,000 feet overcast, and a temperature of 40 degrees Fahrenheit.
Mechanical Condition
The pilot reported that there were no preaccident mechanical anomalies with the airplane. The pilot stated that the loss of engine power was due to carburetor icing.