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ASN Wikibase Occurrence # 202670
Last updated: 21 January 2021
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Date:07-DEC-2017
Time:c 13:30 LT
Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Eurocopter AS 350B3 Ecureuil
Owner/operator:CHP Holding
Registration: RA-07277
C/n / msn: 4514
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:near Chistiy, Bratsk district -   Russia
Phase: En route
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Bratsk Airport (BTK/UIBB)
Destination airport:Chistye Prudy
Investigating agency: MAK
Narrative:
The helicopter crashed on the frozen surface of the Angara River. Both occupants died.

Conclusion:
Most likely, the accident with the Eurocopter AS350B3 RA-07277 was due to the loss of control of the helicopter while flying in conditions of limited visibility, out of sight of the horizon and landmarks. It was not possible to unambiguously determine the cause of the loss of control.

Possible reasons could be: loss of spatial orientation by the pilot in flight conditions for which he was not prepared, or partial or complete loss of performance in flight caused by cardiovascular pathologies, or a combination of these reasons.

The contributing factors, most likely, were:
- unfounded decision by the pilot to continue the flight in conditions for which he was not prepared;
- significant psychoemotional load during flight in conditions of limited visibility;

No signs of failure of the helicopter onboard systems and assemblies were identified until the accident.

Sources:

https://chelorg.com/2017/12/08/in-the-irkutsk-region-carry-out-an-inspection-after-the-incident-with-the-helicopter/
http://irkutsk.bezformata.ru/listnews/poiski-s-vozduha-vertoleta-v-irkutskoj/63277569/
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http://spotters.net.ua/file/?id=79322
https://aviaforum.ru/threads/reestr-vertoletov-eurocopter.25164/page-3
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http://www.interfax.ru/russia/591248
http://www.ntv.ru/novosti/1960484/
https://mak-iac.org/en/rassledovaniya/as-350-ra-07277-07-12-2017/

Accident investigation:
cover
  
Investigating agency: MAK
Status: Investigation completed
Duration: 2 years and 10 months
Download report: Final report
Location


Images:


Photo: MAK

Revision history:

Date/timeContributorUpdates
08-Dec-2017 13:20 Armitec Added
08-Dec-2017 13:56 Iceman 29 Updated [Cn, Operator, Source, Narrative, Photo, ]
08-Dec-2017 15:30 Aerossurance Updated [Time, Aircraft type, Location]
11-Dec-2017 12:41 Iceman 29 Updated [Total fatalities, Other fatalities, Location, Embed code, Damage, Narrative]
11-Dec-2017 13:40 Armitec Updated [Time, Destination airport, Source, Damage, Narrative]
05-Apr-2018 10:13 gerard57 Updated [Total fatalities, Other fatalities, Source, Narrative]
24-Oct-2020 17:53 harro Updated [Departure airport, Narrative, Category, Accident report, Photo]

Corrections or additions? ... Edit this accident description