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| Date: | Monday 24 June 2019 |
| Time: | 16:31 UTC |
| Type: |  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: | External load operation |
| Departure airport: | |
| Investigating agency: | HCLJ |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
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.
Accident investigation:
 |
|
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/
Location
Media:
Inadvertent Entry into IMC During Mountaintop #HESLO (Air Greenland Airbus AS350B3 OY-HGT)https://t.co/6i9rnz3vWB#helicopter #accident #flightsafety #aviationsafety pic.twitter.com/v0GfB7h3XM
— Aerossurance (@Aerossurance) August 8, 2020
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 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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