ASN Wikibase Occurrence # 235497
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| Date: | Saturday 25 April 2020 |
| Time: | 09:54 LT |
| Type: |  Mil Mi-26T |
| Owner/operator: | Abakan Avia |
| Registration: | RA-06268 |
| MSN: | 34001212483 |
| Year of manufacture: | 1992 |
| Total airframe hrs: | 5813 hours |
| Fatalities: | Fatalities: 0 / Occupants: 8 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Russkoye oil field -
 Russia
|
| Phase: | Landing |
| Nature: | Cargo |
| Departure airport: | Urengoy Airport (UEN/USDU) |
| Vankor` | |
| Investigating agency: | MAK |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter crashed during an attempted forced landing following a loss of engine problems.
A surge of the left engine occurred as a result of fatigue failure of blades of the second and third stages of the low pressure compressor following FOD damage during an earlier flight. Rather than conduct a run on landing the crew attempted to land at a helipad, leading to droop of NR and impact.
Conclusion:
The cause of the aviation accident involving the Mi-26T helicopter, registration RA-06268, was the incorrect decision of the captain regarding the procedure for performing a forced landing. The necessity for the forced landing arose due to the failure (surge) of the left engine. Instead of executing a short landing as prescribed by the flight manual, the captain attempted to land on a helipad. As the indicated airspeed decreased with insufficient available power from the operational engine, it led to a reduction in the rotor revolutions, premature landing with an increased vertical speed, and the destruction of the aircraft structure.
The surge in the left engine occurred due to fatigue failure of the working blades of the second and third stages of the low-pressure compressor. Fatigue failure of the working blades originated and developed due to changes in their frequency characteristics caused by the disruption of the blade geometry resulting from the entry of a foreign object into the engine's gas-air tract during one of the previous flights.
Accident investigation:
 |
|
Sources:
https://tass.com/emergencies/1149615
https://iz.ru/1004432/2020-04-25/moment-zhestkoi-posadki-mi-26-na-iamale-popal-na-video
https://mak-iac.org/rassledovaniya/mi-26t-ra-06268-25-04-2020/
Preliminary Report: https://mak-iac.org/upload/iblock/9fa/pr_report_ra-06268.pdf
Final report: https://mak-iac.org/upload/iblock/bfb/vlz3we2p4nxlrdok5arl43z8hq5bw9ub/report_ra-06268.pdf
Location
Images:
Photo: Ministry of Emergencies of Russia for the Yamal-Nenets Autonomous Area
Media:
25 April 2020 Mi-26T RA-06268 accident followed surging / power loss on one engine after prior FOD damage and a decision to attempt a helipad rather than run on landing #helicopter #flightsafety #aviationsafety https://t.co/NS4nOycA9I pic.twitter.com/ElV8XfSLiS
— Aerossurance (@Aerossurance) February 19, 2023
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Apr-2020 10:19 | Aerossurance | Added |
| 25-Apr-2020 10:30 | Aerossurance | Updated [Source, Embed code] |
| 25-Apr-2020 10:32 | Aerossurance | Updated [Date, Narrative] |
| 25-Apr-2020 10:59 | Aerossurance | Updated [Time, Location] |
| 25-Apr-2020 18:49 | harro | Updated [Aircraft type, Registration, Cn, Source, Narrative, Photo] |
| 27-Apr-2020 15:41 | Aerossurance | Updated [Destination airport, Narrative] |
| 27-Apr-2020 15:41 | Aerossurance | Updated [Narrative] |
| 08-May-2020 10:22 | Aerossurance | Updated [Narrative] |
| 23-Jun-2022 19:22 | Hirurg | Updated [Time, Nature, Source] |
| 13-Nov-2023 20:51 | harro | Updated [Other fatalities, Location, Departure airport, Destination airport, Embed code, Narrative, Category, Accident report] |
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