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ASN Wikibase Occurrence # 239070
 
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Date:04-AUG-2020
Time:16:20 LT
Type:Silhouette image of generic R66 model; specific model in this crash may look slightly different    
Robinson R66
Owner/operator:Altai-Avia
Registration: RA-06353
MSN: 0162
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Mt. Belukha, Siberia -   Russia
Phase: En route
Nature:Private
Departure airport:
Destination airport:
Investigating agency: MAK
Confidence Rating: Accident investigation report completed and information captured
Narrative:
A Robinson R66 suffered an accident during an attempted landing on Mt. Belukha, Siberia, Russia. The pilot and passenger were later rescued.

Conclusion
The most probable cause of the aviation accident with the helicopter R- 66 RA-06353 helicopter was a rollover when landing in the mountains. (4,100 m above sea level) under the influence of orographic turbulence (most probably, hitting the rotor). The necessity of landing was caused by the fact that the flight in a strong downward flow with a high probability of collision with the mountain.
The contributing factors most likely were:
- failure to consider orographic and climatic peculiarities of the terrain (orographic and climatic peculiarities of the terrain ; flight in a closed canyon in the afternoon with the highest possible temperature and a strong wind);
- Falling into a strong upward current (local mesostream) while turning that formed in this area and during this period of time, which resulted in "throwing" the helicopter onto the plateau;
- flight over the plateau in the downward flow in conditions of exceeding by 274 m the maximum operating altitude in terms of density and lack of controllability;
- difficulty in determining the flight altitude due to the whiteness of the surface and lack of landmarks in the snow;
- lack of experience and skills of the pilot to perform landings in mountainous terrain at altitudes over 2,000 m.

Sources:

https://siberiantimes.com/other/others/news/two-people-rescued-from-siberias-highest-peak-after-private-robinson-66-helicopter-crash-landed-on-mt-belukha/
https://www.aex.ru/news/2020/8/4/215375/
https://zapsib-sut.sledcom.ru/news/item/1487999/
http://siberiantimes.com/other/others/news/two-people-rescued-from-siberias-highest-peak-after-private-robinson-66-helicopter-crash-landed-on-mt-belukha/
https://mak-iac.org/press-tsentr/arkhiv-za-2020-god/117408/

Accident investigation:
cover
  
Investigating agency: MAK
Status: Investigation completed
Duration: 10 months
Download report: Final report
Location


Images:


Photo: MAK

Revision history:

Date/timeContributorUpdates
04-Aug-2020 14:15 Anon. Added
04-Aug-2020 14:21 harro Updated [Time, Operator, Source, Narrative]
04-Aug-2020 15:05 Aerossurance Updated [Aircraft type, Narrative]
04-Aug-2020 21:30 Aerossurance Updated [Source]
05-Aug-2020 14:22 harro Updated [Registration, Cn, Source]
27-Jun-2021 12:48 harro Updated [Time, Source, Damage, Narrative, Category, Accident report, Photo]
27-Jun-2022 17:37 Hirurg Updated [Total occupants, Phase, Nature]

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