ASN Wikibase Occurrence # 178668
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| Date: | Saturday 15 August 2015 |
| Time: | 18:20 LT |
| Type: |  Mil Mi-8T |
| Owner/operator: | JSC Vostok |
| Registration: | RA-22559 |
| MSN: | 7802 |
| Year of manufacture: | 1979 |
| Fatalities: | Fatalities: 5 / Occupants: 16 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Onhonchan Bay, Khabarovsk Krai -
 Russia
|
| Phase: | En route |
| Nature: | Offshore |
| Departure airport: | Polina Osipenko |
| Shantar Islands | |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The helicopter crashed into the sea and sank after entering VRS while operating over water with a glassy surface. On board were 13 tourists and three crew members. The aircraft had refuelled in Polina Osipenko shortly before en route from Khabarovsk to the Shantar Islands. According to preliminary information, five people were killed (drowning) and the survivors (including the 3 crew) swam to shore. Survivors were evacuated the next day, one had an arm injury. Diving operations commenced on the site 17 August.
The accident was caused by not holding safe altitudes and speed by the crew under the weather deterioration below specified for VFR operations values that resulted in vortex-ring state entering and water collection.
The accident was caused by the crew timely indecision about the transition to IFR flight or diversion to alternate aerodrome under the weather deterioration below specified minima.
The absence of radioaltimeter setting at the safe altitude and manoeuvering over the smooth water surface contributed to the flight altitude monitoring failure.
Sources:
https://mak-iac.org/russian/investigations/2015/mi-8t_ra-22559.html
http://27.mchs.gov.ru/operationalpage/operational/item/3015495/
http://27.mchs.gov.ru/operationalpage/operational/item/3015921/
https://www.kp.ru/daily/26420.5/3293898
https://www.kp.ru/daily/26420.5/3293275
https://mak-iac.org/press-tsentr/2015/114653/
http://dvsut.sledcom.ru/news/item/958742/
https://mak-iac.org/en/press/archive-2015/114654/_
https://mak-iac.org/en/rassledovaniya/mi-8t-ra-22559-15-08-2015
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Aug-2015 12:28 | Hans Gruber | Added |
| 15-Aug-2015 13:04 | Aerossurance | Updated [Nature, Departure airport, Destination airport, Narrative] |
| 15-Aug-2015 15:39 | Hans Gruber | Updated [Aircraft type, Registration, Operator, Total fatalities, Location, Departure airport, Destination airport, Source, Narrative] |
| 15-Aug-2015 15:40 | harro | Updated [Cn, Narrative] |
| 15-Aug-2015 16:26 | Aerossurance | Updated [Location, Departure airport, Narrative] |
| 17-Aug-2015 16:16 | Hans Gruber | Updated [Source, Narrative] |
| 19-Aug-2015 11:54 | Aerossurance | Updated [Operator, Departure airport, Source, Narrative] |
| 21-Aug-2015 06:41 | Anon. | Updated [Source] |
| 29-Dec-2015 19:00 | Aerossurance | Updated [Source, Narrative] |
| 01-Aug-2016 08:01 | Aerossurance | Updated [Source, Narrative] |
| 25-Dec-2020 15:25 | harro | Updated [Nature] |
Corrections or additions? ... Edit this accident description
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