NTSB Identification: ANC86IA066.
The docket is stored on NTSB microfiche number 31832.
Nonscheduled 14 CFR
Incident occurred Friday, June 06, 1986 in MANOKOTAK, AK
Aircraft: CESSNA 207, registration: N1737U
Injuries: 6 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
DURING CRUISE FLIGHT THE ENGINE BEGAN TO RUN ROUGH. THE PILOT ATTEMPTED SWITCHING FUEL TANKS BUT THE ENGINE CONTINUED TO RUN ROUGH. THE ENGINE CEASED OPERATION AND DID NOT WINDMILL DURING THE EMERGENCY DESCENT. AN EXAMINATION OF THE ENGINE LATER REVEALED THAT THE CRANKSHAFT HAD FRACTURED IN THE VICINITY OF THE NUMBER 2 AND 3 CRANKSHAFT JOURNAL. THE MODE OF FRACTURE WAS NOT DETERMINED. AN OFF ARPT FORCED LNDG WAS ACCOMPLISHED WITHOUT FURTHER INCIDENT.
The National Transportation Safety Board determines the probable cause(s) of this incident to be:ENGINE ASSEMBLY,CRANKSHAFT..FAILURE,TOTAL
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