Accident Description
During the takeoff roll, the engine lost power, causing the aircraft to crash-land. The landing gear collapsed upon impact.
Examination Findings
Post-accident examination of the engine revealed that the crankshaft, part number 631716, had broken in the cheek area between the number 2 and number 3 crank throws.
Prior Incident and Maintenance
One month before the accident, the aircraft had collided with a fence. After replacing the propeller, the aircraft was returned to service without overhauling the engine. Teledyne Continental Motors Service Bulletin M71-5, which addresses examination of engines involved in propeller strike accidents, states that the only sure method of inspecting for internal damage is complete engine disassembly and magnetic particle inspection of the crankshaft, gears, and other components.