ASN Wikibase Occurrence # 361622
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| Date: | Saturday 24 July 1993 |
| Time: | 23:20 LT |
| Type: |  Cessna 172N |
| Owner/operator: | Airman's Flight School, Inc. |
| Registration: | N4884G |
| MSN: | 17273431 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 2904 hours |
| Engine model: | LYCOMING O-320-H2AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Purcell, OK -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Norman, OK (KOUN) |
| Gainesville, TX (KGLE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause: 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.
Accident investigation:
 |
|
Sources:
NTSB FTW93LA216
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 20:26 | ASN Update Bot | Added |
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