NTSB Identification: SEA91LA031.
The docket is stored on NTSB microfiche number 43173.
Accident occurred Sunday, December 09, 1990 in BOZEMAN, MT
Probable Cause Approval Date: 12/08/1992
Aircraft: BEECH 3NM, registration: N9159B
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 BEECH 3NM SUSTAINED SUBSTANTIAL DAMAGE WHEN THE RIGHT ENGINE MASTER ROD FAILED AND THE CRANKSHAFT SEIZED. THE PROPELLER SEPARATED AND STRUCK THE NOSE OF THE AIRPLANE, DOING STRUCTURAL DAMAGE AND SHEARING OFF A NOSE FUEL TANK. THE PILOT RETURNED SAFELY TO HIS DEPARTURE POINT.

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

THE FAILURE OF THE RIGHT ENGINE MASTER ROD.

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