ASN Wikibase Occurrence # 21712
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| Date: | Monday 30 June 2008 |
| Time: | 12:50 |
| Type: |  Cessna 172M Skyhwak |
| Owner/operator: | Flying Vikings |
| Registration: | N61736 |
| MSN: | 17264762 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 13036 hours |
| Engine model: | Lycoming O-320-E2D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Oakland, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | Hayward, CA (KHWD) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During cruise flight, the pilot noticed the engine was running rough along with a surge in power. He adjusted the mixture to the full rich position, which seemed to smooth the roughness. A few seconds later, he noticed that the engine oil temperature gauge was rising and he diverted towards a nearby airport. The pilot stated that while en route to the airport, the engine lost power and he initiated a forced landing to an open lot near his position. During the landing roll, the airplane struck a large mound of dirt. Examination of the airplane revealed structural damage to the fuselage. Only residual oil was found in the engine. Examination of the engine revealed evidence of an internal oil starvation induced catastrophic failure. The nuts securing the vacuum pump to the mounting pad were loose. About 10 psi of compressed air was applied to the oil cooler inlet port on the engine. Bubbling oil was observed originating from the vacuum pump mounting pad. No further anomalies were noted. Review of maintenance records revealed that the vacuum pump was replaced prior to the accident flight.
Probable Cause: A loss of engine power due to oil starvation. The oil starvation event was due to the failure of maintenance personnel to tighten the mounting bolts for the newly installed vacuum pump.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Jul-2008 08:56 | Fusko | Added |
| 21-Dec-2016 19:14 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:16 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:20 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 03-Dec-2017 11:23 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Source, Narrative] |
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