NTSB Identification: FTW85LA116.
The docket is stored on NTSB microfiche number 30408.
Accident occurred Sunday, February 03, 1985 in SHEFFIELD, TX
Aircraft: Beech C-35, registration: N5821X
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY..FATIGUE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY,CONNECTING ROD..BINDING(MECHANICAL)

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY,BEARING..BINDING(MECHANICAL)

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY,CRANKSHAFT..FATIGUE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,REPLACEMENT..IMPROPER..OTHER MAINTENANCE PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,MAJOR REPAIR..IMPROPER..OTHER MAINTENANCE PERSONNEL

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