Accident Sequence
The pilots took off, and approximately half an hour after engine startup, the engine lost power at an unknown altitude and location. It is unknown which pilot, or if both pilots, were at the controls. The pilot(s) attempted to stretch the power-off glide to a grass airstrip. Prior to landing, the airplane impacted small tree branches about 60-70 feet above the ground, then stalled, and subsequently struck the runway environment out of control and tumbled.
Investigation Findings
There was no evidence of any mechanical anomaly of the airframe or engine, and there was sufficient fuel onboard. An engine test cell run with the original carburetor, which had been damaged in the accident, resulted in a successful first start, and incremental increases of power to 2,400 rpm. Replacement of the original carburetor resulted in incremental increases of power to 2,680 rpm.
Carburetor Icing Analysis
A Federal Aviation Administration (FAA) icing probability chart indicated no probability of carburetor icing, while several non-FAA charts indicated a probability of carburetor icing at glide and cruise power. In addition, the Cessna 182 is prone to carburetor icing.