NTSB Identification: NYC91LA160.
The docket is stored on NTSB microfiche number 44153.
Accident occurred Sunday, June 30, 1991 in LANCASTER, NY
Probable Cause Approval Date: 05/27/1993
Aircraft: CESSNA 140, registration: N89209
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.

N89209 WAS CRUISING, WHEN THE PILOT 'HEARD A POP, THEN RATTLE FROM THE ENGINE.' THE PILOT SAID, '[I] WAS GOING TO TRY TO MAKE [AN] AIRPORT...[I] THROTTLED UP...[THE ENGINE] VIBRATED AND KNOCKED TOO HARD.' THE PILOT LANDED IN A FIELD AND THE AIRPLANE STRUCK A DITCH. AN EXAMINATION OF THE ENGINE REVEALED A BROKEN NUMBER 3 EXHAUST VALVE. A METALLURGICAL EXAMINATION OF THE VALVE REVEALED THE FAILURE WAS THE RESULT OF PROGRESSIVE FATIGUE, NOT INSTANTANEOUS OVERLOAD.

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

THE FAILURE OF AN ENGINE EXHAUST VALVE, WHICH RESULTED IN A LOSS OF ENGINE POWER AND A FORCED LANDING ON UNSUITABLE TERRAIN.

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