ASN Wikibase Occurrence # 133325
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| Date: | Monday 11 November 1996 |
| Time: | 12:05 LT |
| Type: |  Cessna 152 |
| Owner/operator: | Sunbird Flight Services |
| Registration: | N714VX |
| MSN: | 15279477 |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 6654 hours |
| Engine model: | Lycoming O-235-L2C |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Williams, AZ -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | (40G) |
| Sedona, AZ (KSEZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the pilot, during initial climb, the engine gradually lost power. Subsequently, it crash landed on uneven/rocky terrain and came to rest against trees in an inverted attitude. Density altitude was computed to be about 7,300 feet. The pilot reported that prior to the flight, when he first started the engine, no indication of oil pressure was observed. He shut down the engine and purchased 1 quart of oil. No abnormal indications were observed during the subsequent ground check out or takeoff roll. However, during the initial climb, the oil pressure indicator dropped to zero pounds. A teardown examination of the engine was performed. The crankshaft assembly revealed signatures consistent with heat distress in the number 2 main journal area. The oil pump's drive shaft was found broken. A foreign metal object was observed wedged between the teeth of the pump's driving and driven gears, and the engagement end of the oil pump drive shaft was found sheared off. The foreign object resembled a small bolt or screw, which was not used in the manufacture of the engine.
Probable Cause: a foreign object in the oil system, which resulted in failure of the oil pump, oil starvation, loss of engine power, and a subsequent forced landing. Rough/uneven terrain in the emergency landing area was a related factor.
Accident investigation:
 |
|
Sources:
NTSB LAX97LA037
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 08-Apr-2024 18:07 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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