ASN Wikibase Occurrence # 361077
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| Date: | Friday 12 November 1993 |
| Time: | 12:30 LT |
| Type: | Hawkins |
| Owner/operator: | Northwest Helicopters, Inc. |
| Registration: | N91NW |
| MSN: | 62-1915 |
| Total airframe hrs: | 10106 hours |
| Engine model: | LYCOMING T53-L11D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | North Bend, WA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT HEARD LOUD GRINDING SOUNDS FROM THE REAR OF THE AIRCRAFT, FOLLOWED BY BANGING SOUNDS AND A LOSS OF DIRECTIONAL CONTROL. HE JETTISONED HIS LOGS, THEN HIS LONG LINE, AND EXECUTED A POWERED AUTOROTATION INTO THE TREES, SUBSTANTIALLY DAMAGING THE AIRCRAFT. THE 42 DEGREE INTERMEDIATE GEARBOX WAS EXAMINED AND MULTIPLE ORIGIN FATIGUE CRACKS WERE FOUND IN FRAGMENTS OF THE INPUT PINION GEAR.
Probable Cause: TOTAL FAILURE OF THE INTERMEDIATE GEARBOX. THE LACK OF SUITABLE TERRAIN FOR AN AUTOROTATION WAS A FACTOR.
Accident investigation:
 |
|
Sources:
NTSB SEA94LA030
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 14:33 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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