SHEFFIELD, TX, USA
N5821X
Beech C-35
THE PLT STATED THE ENG FAILED COMPLETELY DURING CRUISE. THE CRANKSHAFT WAS FOUND SEPARATED DURING THE ENG TEARDOWN, WITH THE ROD AND BEARINGS ALSO SEPARATED. METALLURGICAL TESTING REVEALED FRACTURES TO BE FROM FATIGUE. ENG MAINTENANCE HAD BEEN IMPROPERLY ACCOMPLISHED DURING REPLACEMENT OF PISTONS AND ROD COMPONENTS. RODS HAD NOT BEEN PROPERLY ALIGNED, THUS ALLOWING BEARINGS AND CAPS TO RUB AND GROOVE THE CRANKSHAFT, CAUSING THE FAILURE POINT.
Source: NTSB Aviation Accident Database
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