Accident Overview
A pilot reported completing the pretakeoff check and run-up successfully. During the initial climb, at approximately 400 feet above ground level, the engine lost power. Despite attempts to restart the engine, the pilot was unable to regain power. The airplane subsequently impacted in a wooded area about half a mile north of the airport.
Maintenance History
This flight was the second conducted while the airplane was under maintenance to investigate two prior incidents of partial power loss during initial climb. The previous partial power losses had prompted the maintenance action.
Post-Accident Examination
After the accident, the airplane was moved to a hangar. An engine run was performed after installing a substitute propeller. During this run, the engine achieved over 2675 RPM and 26 inches of manifold pressure. Examination of the fuel servo inlet screens revealed evidence of rust and contamination. Further testing of the servo indicated the presence of water and corrosion in the diaphragm assembly.