Accident Sequence
Shortly after liftoff, witnesses reported that the engine began to run rough. The airplane crossed the departure end of the runway, and the pilot began a 180-degree turn to return to the airport. During the turn, the pilot failed to maintain a proper airspeed, and the airplane stalled.
Investigation Findings
The investigation revealed that sand and other debris had been found in the fuel tank a week before the accident. The mechanic drained the fuel but did not remove the tank at the owner's request. The owner then added auto gas and returned the airplane to its home base. Examination of the wreckage disclosed sand and debris in the fuel system and an inoperative left magneto. However, the tachometer indicated 2450 RPM, and the propeller blades exhibited extensive power at impact signatures.