ASN Wikibase Occurrence # 295488
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| Date: | Monday 21 July 2003 |
| Time: | 11:45 LT |
| Type: |  Cessna 182S |
| Owner/operator: | Private |
| Registration: | N146NE |
| MSN: | 18280221 |
| Year of manufacture: | 1998 |
| Total airframe hrs: | 880 hours |
| Engine model: | Lycoming IO-540-AB1A5 |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Henry's Lake, Idaho -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Henry's Lake, ID (U53) |
| Pocatello Airport, ID (PIH/KPIH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that about five minutes after takeoff, the oil low pressure light illuminated and shortly thereafter he heard a knocking sound coming from the engine. The pilot shut the engine down and attempted to return to the airport of departure. Unable to make it to the airport, a power-off landing was made to a rough open field about one mile from the runway. Although the touchdown was uneventful, during the landing roll, the aircraft encountered a ditch, which resulted in the separation of the nose gear and substantial damage to the aircraft structure. On site inspection of the aircraft indicated that oil residue was noted at the aft end of the engine around the accessory section. After the tail was lowered, a noticeable oil leak was noted around the vacuum pump flange (approximately 6 drops per minute). Further inspection of the engine found that the pneumatic pump gasket had failed and was blown out the top between the mating surfaces of the pump and the mounting pad. All four mounting nuts of the pump were found only slightly more than finger tight and were removed with no resistance. The internal star locking washers were in place under the nuts and had been crushed indicating proper torque at one time. Standard torque on these nuts is 90" pounds.
Probable Cause: A set of inadequately torqued vacuum pump retaining nuts, leading to the failure of the vacuum pump gasket, resulting in oil exhaustion, which resulted in a loss of engine power during cruise. A ditch and rough uneven terrain were factors.
Accident investigation:
 |
|
Sources:
NTSB SEA03LA146
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Oct-2022 09:08 | ASN Update Bot | Added |
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