NTSB Identification: FTW93LA216.
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Accident occurred Saturday, July 24, 1993 in PURCELL, OK
Probable Cause Approval Date: 09/26/1994
Aircraft: CESSNA 172N, registration: N4884G
Injuries: 2 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.

THE AIRPLANE COLLIDED WITH ROUGH TERRAIN DURING A NIGHT FORCED LANDING FOLLOWING A PARTIAL POWER LOSS. THE ACCIDENT OCCURRED DURING A NIGHT DUAL INSTRUCTIONAL FLIGHT AND THE INSTRUCTOR MADE THE FORCED LANDING. INVESTIGATION REVEALED THAT THE #3 EXHAUST VALVE ROCKER ARM ATTACHMENT STUD HAD FAILED IN FATIGUE. THE SEPARATED STUD SUBSEQUENTLY LODGED UNDER THE #3 INTAKE VALVE MECHANISM AND THE CORRESPONDING PUSH ROD WAS BENT. THE ENGINE AND SUBJECT PARTS HAD ACCUMULATED A TOTAL OF 2,903.5 HOURS.

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

THE LACK OF SUITABLE TERRAIN ONTO WHICH TO EXECUTE THE FORCED LANDING WHICH WAS NECCESITATED BY THE PARTIAL POWER LOSS. THE POWER LOSS WAS A RESULT OF THE FATIGUE FAILURE OF THE EXHAUST VALVE ROCKER ARM ATTACHMENT STUD. A FACTOR WAS THE NIGHT CONDITIONS.

Full narrative available

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