ASN Wikibase Occurrence # 30096
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| Date: | Tuesday 11 July 2000 |
| Time: | 12:30 |
| Type: |  Kaman K-1200 K-Max |
| Owner/operator: | Superior Helicopter Llc |
| Registration: | N311KA |
| MSN: | A94-0017 |
| Year of manufacture: | 1996 |
| Total airframe hrs: | 7231 hours |
| Engine model: | Lycoming T5317A-1 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Cusick, WA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | External load operation |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While lifting approximately 5,000 pounds of logs from the drop area, the aero-logging helicopter experienced a malfunction of the free-wheeling sprag clutch assembly, and a resultant torsional separation of the engine drive adapter. Although the pilot attempted an emergency descent to a down-slope clearing, the aircraft impacted trees and dropped onto the terrain below.
Probable Cause: The termination of power to the main rotor system as a result of the malfunction of the free-wheeling sprag clutch assembly, followed by the torsional overload separation of the engine adapter shaft. Factors include trees in the area where the emergency descent was attempted.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X21608&key=1
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 07-Aug-2010 08:35 | Alpine Flight | Updated [Time, Aircraft type, Operator, Phase, Nature, Source, Damage, Narrative] |
| 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] |
| 12-Dec-2017 18:56 | ASN Update Bot | Updated [Operator, Nature, Departure airport, Destination airport, Source, Narrative] |
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