ASN Wikibase Occurrence # 366654
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| Date: | Tuesday 3 July 1990 |
| Time: | 14:40 LT |
| Type: |  Cessna 150G |
| Owner/operator: | Phn Air Services, Inc. |
| Registration: | N4690X |
| MSN: | 15064740 |
| Year of manufacture: | 1966 |
| Total airframe hrs: | 3013 hours |
| Engine model: | CONTINENTAL O-200-A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Manchester, MI -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Pontiac, MI (KPTK) |
| Clinton, MI (NONE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT REPORTED THAT DURING NORMAL CRUISE FLIGHT HE NOTICED A 'SEVERE VIBRATION, AS WELL AS A TREMENDOUS LOSS OF POWER.' HE EXECUTED A FORCED LANDING IN A SOFT, RECENTLY PLOWED FIELD. WHEN THE NOSEWHEEL TOUCHED DOWN, THE AIRCRAFT NOSED OVER AND CAME TO A STOP UPSIDE DOWN. A POST-ACCIDENT INSPECTION OF THE ENGINE REVEALED NO COMPRESSION IN THE #2 CYLINDER. FURTHER EXAMINATION REVEALED THAT THE #2 CYLINDER EXHAUST VALVE WAS STUCK IN THE FULL OPEN POSITION. THE MOST RECENT MAINTENANCE WAS AN ANNUAL INSPECTION DATED FIVE MONTHS BEFORE THE ACCIDENT, AND THE AIRCRAFT/ENGINE HAD ACCUMULATED 83 HOURS SINCE THAT TIME. THE COMPRESSION CHECK WAS SATISFACTORY ON ALL CYLINDERS AT THE TIME OF THE ANNUAL INSPECTION.
Probable Cause: LOSS OF ENGINE POWER DUE TO A STUCK EXHAUST VALVE.
Accident investigation:
 |
|
Sources:
NTSB CHI90LA167
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Mar-2024 10:43 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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