Incident Description
Witnesses reported that the aircraft's takeoff and initial climb appeared normal. Shortly thereafter, the aircraft leveled off at approximately 200 feet above ground level, and some witnesses heard sounds consistent with a cessation of engine power. The aircraft then began a left turn, during which the bank angle increased to an excessive degree. Subsequently, the aircraft pitched nose-down and crashed into a gravel parking lot located in an industrial area of the city.
Investigation Findings
Examination of the wreckage revealed that the engine-driven fuel pump shaft had failed at its manufactured shear point. This failure occurred due to binding of the pump blades against the pump bore. No foreign material was found inside the bore; however, a small sliver of black rubber was discovered on the pump relief valve poppet. The engine fuel hoses had been replaced prior to this flight. Additionally, the boost pump switch was found in the 'OFF' position. It was noted that the pilot-owner at the controls did not hold a current medical certificate. The pilot-in-command, who was seated in the right seat, was not current in the make and model of the aircraft. The previous aircraft owned by the pilot had the fuel boost pump switch located in a different cockpit position.