NTSB Identification: NYC91LA191.
The docket is stored on NTSB microfiche number 45687.
Accident occurred Sunday, July 28, 1991 in WILLIAMSTOWN, MA
Probable Cause Approval Date: 04/27/1993
Aircraft: Beech C-23, registration: N7690R
Injuries: 1 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.

A 200 HOUR PRIVATE PILOT EXPERIENCED A COMPLETE LOSS OF ENGINE POWER WHILE IN CRUISE FLIGHT AT 3,000 FEET. THE ENGINE FAILURE WAS THE RESULT OF THE CRANKSHAFT GEAR RETAINING BOLT BACKING OUT RESULTING IN THE DISENGAGEMENT OF THE CRANKSHAFT. THE ENGINE HAD RECENTLY BEEN OVERHAULED, BUT THE MANUFACTURER'S SERVICE INSTRUCTIONS WERE NOT COMPLIED WITH AT THE TIME OF THE ENGINE OVERHAUL. SUITABLE TERRAIN WAS NOT AVAILABLE TO THE PILOT TO EXECUTE A SUCCESSFUL FORCED LANDING.

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

ENGINE FAILURE AS A RESULT OF IMPROPER ENGINE OVERHAUL PERFORMED BY OTHER MAINTENANCE PERSONNEL. A FACTOR WAS THE LACK OF SUITABLE TERRAIN.

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