Incident Eurocopter EC 120B Colibri JA710H, 19 Feb 2012
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ASN Wikibase Occurrence # 143875
 
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Date:19-FEB-2012
Time:13:25
Type:Silhouette image of generic EC20 model; specific model in this crash may look slightly different    
Eurocopter EC 120B Colibri
Owner/operator:Heli-Sys Japan
Registration: JA710H
MSN: 1074
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Karifuridake Minamifurano Sorachi-gun, Hokkaido -   Japan
Phase: Take off
Nature:Ferry/positioning
Departure airport:Karifuridake
Destination airport:
Confidence Rating: Information verified through data from accident investigation authorities
Narrative:
Rolled over on takeoff near a mountain summit. The helicopter had just dropped off several skiers and guides on a mountain heli pad.
Probable Causes:
In this accident, it is highly probable that the helicopter rolled over in a state of dynamic roll-over during a liftoff, and sustained damage.
It is probable that the helicopter’s continued liftoff sequence with the right skid caught by an obstacle lead to a dynamic roll-over.
It is highly probable that nobody on the ground noticed the degraded helipad conditions contaminated by the obstacles probably the branches of creeping pines which had protruded through the snow surface and they caught the helicopter before liftoff.
As the pilot lacked sufficient knowledge and skills for snow-covered mountain top operations, it is possible that he failed to: pay special attention to the obstacles on the ground; ask an escort to check the obstacles when he aborted the liftoff sequence; and resumed the liftoff sequence making sure that the helicopter would not roll again after he suspended the takeoff operation.

Sources:

http://www.mlit.go.jp/jtsb/eng-air_report/JA710H.pdf
http://www.mlit.go.jp/jtsb/bunseki-kankoubutu/jtsbdigests_e/jtsbdigests_No11/No11_pdf/jtsbdi-11_1820.pdf


Revision history:

Date/timeContributorUpdates
21-Feb-2012 12:14 harro Added
26-Jan-2013 06:28 harro Updated [Time, Operator, Phase, Departure airport, Source, Damage, Narrative]
09-Mar-2013 13:49 TB Updated [Aircraft type, Nature, Damage, Narrative]
22-Aug-2014 12:06 Aerossurance Updated [Source]

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