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ASN Wikibase Occurrence # 47874
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Time:16:52 LT
Type:Silhouette image of generic KMAX model; specific model in this crash may look slightly different
Kaman K-1200 K-Max
Owner/operator:Rotex Helicopters AG
Registration: HB-XQA
MSN: A94-0008
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Grandvillard, FR -   Switzerland
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:External load operation
Departure airport:Guttet-Feschel/VS
Destination airport:Truyo, Commune de Grandvillars
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.

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:
Investigating agency: 
Status: Investigation completed
Download report: Final report

Revision history:

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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