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ASN Wikibase Occurrence # 226848
Last updated: 11 September 2021
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Date:24-JUN-2019
Time:16:31 UTC
Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Eurocopter AS 350B-3 Ecureuil
Owner/operator:Air Greenland
Registration: OY-HGT
MSN: 4279
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Dye 1 radiostation, Qaqatoqaq Mountain -   Greenland
Phase: En route
Nature:Cargo
Departure airport:
Destination airport:
Investigating agency: HCLJ Denmark
Narrative:
During a sling operation of a fuel tank to a telesite station on a mountaintop, the helicopter, while positioning for the agreed-upon delivery point, entered orographic clouds causing loss of pilot external visual references.
While attempting to recover, loss of external visual cues led to spatial disorientation and a partial loss of control of the helicopter.
Downhill on a southerly track, the fuel tank, at the end of the 30-meter long line, started colliding with rocky terrain.
After a cargo hook release of the fuel tank, and on a position approximately 100 meters (m) downhill, the helicopter skids impacted with rocky terrain, and the long line entangled with rocks.
The helicopter ended up on its right-hand side with the nose section facing towards the telesite.

CONCLUSIONS:
The helicopter, while positioning for the agreed-upon delivery point, entered orographic clouds causing loss of pilot external visual references. While attempting to recover, loss of external visual cues led to spatial disorientation and a partial loss of control of the helicopter.

Sources:

https://www.bea.aero/en/investigation-reports/notified-events/detail/event/accident-de-lairbus-as350-immatricule-oy-hgt-survenu-le-24062019-pres-de-la-station-dye-1-enquet/
http://aerossurance.com/helicopters/inadvertent-imc-mountain-heslo/
https://en.havarikommissionen.dk/aviation-archive/2020/2019-283/

Accident investigation:
cover
  
Investigating agency: HCLJ Denmark
Status: Investigation completed
Duration: 6 months
Download report: Final report

Media:


Revision history:

Date/timeContributorUpdates
06-Jul-2019 17:54 harro Added
13-Jan-2020 15:20 Aerossurance Updated [Total occupants, Location, Nature, Source]
13-Jan-2020 17:17 harro Updated [Time, Narrative, Accident report, ]
08-Aug-2020 14:05 Aerossurance Updated [Source, Embed code]
08-Aug-2020 14:05 Aerossurance Updated [Embed code, Plane category]

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