ASN Wikibase Occurrence # 359828
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| Date: | Wednesday 7 September 1994 |
| Time: | 14:00 LT |
| Type: |  Cessna 172M |
| Owner/operator: | Private |
| Registration: | N61838 |
| MSN: | 17264832 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 2263 hours |
| Engine model: | LYCOMING O-320-E2D |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Coolin, ID -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Cavinaugh Bay, ID (66S |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PRIVATE PILOT WAS FORCED TO LAND THE AIRPLANE ON UNSUITABLE TERRAIN BECAUSE OF A LOSS OF ENGINE POWER. DURING THE FORCED LANDING, THE AIRPLANE IMPACTED A TREE STUMP, NOSED OVER, AND WAS SUBSTANTIALLY DAMAGED. AN EXAMINATION OF THE ENGINE REVEALED THAT THE ROCKER ARM FOR THE NO. 1 CYLINDER EXHAUST VALVE HAD FAILED. AN EXAMINATION OF THE ROCKER ARM REVEALED THAT THE ARM HAD FAILED DUE TO FATIGUE, AND THAT THE FATIGUE CRACKING WAS INITIATED AT ROUGH TOOL MARKS PRODUCED DURING THE CHAMFERING OF THE ARM'S OIL HOLE. THE CHAMFERING WAS PERFORMED BY THE ENGINE MANUFACTURER DURING REMANUFACTURE OF THE ENGINE.
Probable Cause: THE FAILURE OF THE ENGINE MANUFACTURER TO PROPERLY REMANUFACTURE AND ADEQUATELY INSPECT THE NO. 1 ROCKER ARM PRIOR TO ITS INSTALLATION ON THE ENGINE. THIS RESULTED IN FATIGUE CRACKING OF THE ROCKER ARM AND A SUBSEQUENT LOSS OF ENGINE POWER.
Accident investigation:
 |
|
Sources:
NTSB SEA94LA235
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 15:02 | ASN Update Bot | Added |
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