Event Description
During the takeoff roll, the engine lost power when the aircraft reached approximately 100 ft above ground level. The pilot decided to abort the climb and land the aircraft back on the runway to avoid rough terrain beyond the departure end. The aircraft was landed with the landing gear retracted.
Investigation Findings
Post-accident examination of the fuel system revealed fuel present in the main fuel tanks and the right auxiliary tank. However, no fuel was found in the carburetor or in the return line to the tanks. The left auxiliary tank was empty. The pilot reported that the fuel selector had been positioned to the left main tank for takeoff. After the engine began sputtering, he moved the fuel selector to the auxiliary position and operated the hand wobble pump, but engine power was not restored.
Propeller strike marks were observed on the runway surface, and the propeller blades exhibited striation marks consistent with ground contact. A fibrous material was found inside the right auxiliary tank, but no contamination was detected in the gascolator or carburetor screen.
Post-Accident Testing
Following the accident, the engine was started and operated normally, indicating no mechanical malfunction.
Additional Information
The aircraft was placarded with a warning that the auxiliary fuel tanks were approved for use in level flight only.