ASN Wikibase Occurrence # 47874
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| Date: | Monday 11 October 2004 |
| Time: | 16:52 LT |
| Type: |  Kaman K-1200 K-Max |
| Owner/operator: | Rotex Helicopters AG |
| Registration: | HB-XQA |
| MSN: | A94-0008 |
| Year of manufacture: | 1994 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Location: | Grandvillard, FR -
 Switzerland
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | External load operation |
| Departure airport: | Guttet-Feschel/VS |
| Truyo, Commune de Grandvillars | |
| Investigating agency: | BFU Switz. |
| Confidence Rating: |  Accident investigation report completed and information captured |
During logging operations, the helicopter crashed into trees, pilot was seriously injured and helicopter was destroyed.
In the final phase of taking up the cargo, the free-wheel could not transmit the engine torque anymore. The main rotor speed dropped as a result of insufficient torque transmission. The pilot ensured the external load was safely dropped away from the ground crew.
In a summary the manufacturer listed a total of 17 incidents and accidents reported by operators in connection with the free-wheel clutch on this type of helicopter between 1999 and 2004.
Causes:
The accident is attributable to a failure of the clutch assembly.
The failure of the clutch assembly was caused by overloading and fatigue of the bearing surfaces on the free-wheel clutch shaft.
A contributing factor was with high probability the delayed sliding out of the load from the belly cargo hook.
Accident investigation:
 |
|
Sources:
http://www.bfu.admin.ch/common/pdf/2072_e.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Nov-2008 10:15 | ASN archive | Added |
| 07-Aug-2010 08:35 | Alpine Flight | Updated [Aircraft type, Operator, Phase, Nature, Source, Narrative] |
| 26-Jul-2012 01:11 | harro | Updated [Source, Narrative] |
| 10-Sep-2017 11:42 | Aerossurance | Updated [Time, Narrative] |
Corrections or additions? ... Edit this accident description
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