ASN Wikibase Occurrence # 365504
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| Date: | Thursday 4 April 1991 |
| Time: | 20:40 LT |
| Type: |  Cessna 172N |
| Owner/operator: | West Valley Flying Club Inc. |
| Registration: | N733MQ |
| MSN: | 17268400 |
| Year of manufacture: | 1976 |
| Total airframe hrs: | 5600 hours |
| Engine model: | LYCOMING O-320-H2AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Stockton, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Training |
| Departure airport: | Palo Alto, CA (KPAO) |
| Stockton, CA (KSCK) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE CERTIFICATED COMMERCIAL PILOT/CERTIFIED FLIGHT INSTRUCTOR AND A CERTIFICATED PRIVATE PILOT/INSTRUMENT STUDENT WERE IN A HOLDING PATTERN, IN VFR CONDITIONS, WHILE ON AN INSTRUMENT TRAINING FLIGHT WHEN THE ENGINE QUIT. THE CFI MADE A FORCED LANDING IN AN OPEN FIELD. DURING THE LANDING ROLL, THE AIRPLANE ENCOUNTERED SOFT TERRAIN AND NOSED OVER. EXAMINATION OF THE ENGINE REVEALED THAT THE MAGNETO ASSEMBLY FELL OFF THE ENGINE. AN IMPROPER GASKET WAS INSTALLED UNDER THE MAGNETO HOUSING THAT PREVENTED THE MAGNETO FROM BEING PROPERLY TIGHTENED TO THE REQUIRED TORQUE SETTING. GASKET MATERIAL UNDER THE NUT PROVIDED A CUSHION AFFECT THAT ALLOWED THE NUT TO VIBRATE LOOSE.
Probable Cause: THE INSTALLATION BY MAINTENANCE PERSONNEL OF AN INCORRECT GASKET THAT RESULTED IN THE LOSS OF THE ENGINE MAGNETO.
Accident investigation:
 |
|
Sources:
NTSB LAX91LA157
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 10:50 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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