ASN Wikibase Occurrence # 284547
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| Date: | Monday 23 July 2007 |
| Time: | 17:30 LT |
| Type: |  de Havilland Canada DHC-2 Beaver |
| Owner/operator: | Private |
| Registration: | N6784L |
| MSN: | 273 |
| Year of manufacture: | 1952 |
| Total airframe hrs: | 13600 hours |
| Engine model: | Pratt & Whitney R-985 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kalispell, Montana -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Mount Vernon-Skagit Regional Airport, WA (MVW/KBVS) |
| Lewistown Municipal Airport, MT (LWT/KLWT) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in cruise flight over a wilderness area, the engine sputtered and then lost power. The pilots attempted to restart the engine, and then began to look for a place to land. The pilot landed the airplane on a gravel/sand bar area near a river. The airplane sustained structural damage to the firewall, a wing strut, and leading edge damage to the horizontal stabilizer. The pilots reported that the oil pressure and cylinder head temperature gages were in the green prior to the event, and there was no indication that there was anything wrong. An inspection of the engine revealed that the master rod end had broken. No metal pieces were observed in either the oil filter or oil sump. Further inspection of the engine revealed that the supercharger impeller shaft bearings (blower bushing) had failed. The supercharger impeller bearings are an area that requires lubrication, and if they fail, raw oil can be pumped into the induction system, which could cause various engine problems, including detonation.
Probable Cause: A loss of engine power due to the failure of the supercharger impeller bushing, which allowed raw oil to enter the induction system.
Accident investigation:
 |
|
Sources:
NTSB LAX07LA238
History of this aircraft
Other occurrences involving this aircraft
| 3 September 2015 | N55WE | Kruse Jeff | 0 | Arctic Village, Alaska | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2022 18:22 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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