NTSB Identification: SEA92LA149.
The docket is stored on NTSB microfiche number 46857.
Accident occurred Saturday, July 11, 1992 in DELTA, UT
Probable Cause Approval Date: 08/31/1993
Aircraft: CESSNA 172L, registration: N9871G
Injuries: 4 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.

DURING A PLEASURE CROSS COUNTRY FLIGHT, THE AIRPLANE BEGAN TO SHAKE AND THE ENGINE RPM DECREASED. THE PILOT DIVERTED TO A NEARBY RUNWAY AND LANDED DOWNWIND. AFTER THE AIRPLANE TOUCHED DOWN, IT BOUNCED AND CONTINUED TO BOUNCE THE LENGTH OF THE RUNWAY. THE AIRPLANE FINALLY SETTLED AS IT RAN OFF THE END OF THE RUNWAY AND CONTINUED TO TRAVEL THROUGH A BARBED WIRE FENCE AND BEEHIVE BOXES BEFORE COMING TO REST. POST-CRASH INSPECTION OF THE ENGINE REVEALED THAT THE NUMBER 4 INTAKE VALVE WAS BROKEN. DUE TO DAMAGE OF THE FRACTURE ENDS, THE FAILURE MODE WAS NOT DETERMINED.

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

THE FAILURE OF AN INTAKE VALVE AND THE POORLY EXECUTED FORCED LANDING.

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