Accident Overview
The airplane experienced an in-flight loss of engine power, leading to a forced landing near a lake. During the landing, the airplane struck trees and terrain, resulting in substantial damage. An air traffic controller received a radio transmission from an airplane reporting a distress call from the accident airplane.
Examination of the Wreckage
On-scene examination of the wreckage focused on the fuel system. The right fuel tank's vented fuel tank cap contained debris in its vent holes. The fuel vent was found blocked with debris. Additionally, liquid was present in the bottom of the carburetor bowl.
Engine Test and Fuel Analysis
The engine was subsequently test run and performed satisfactorily. Analyses of liquids collected from the wreckage indicated that the fuel was aviation gasoline, similar to a reference AVGAS sample. However, variations were noted depending on the manufacturer. Solids found in the fuel consisted of a mixture of carboxylates, esters of carboxylic acids, rust, and cellulose fibers.
Pilot Flight History
Logbook entries showed that the pilot's most recent flight was approximately one year before the accident. That flight was conducted in the accident airplane.