ASN Wikibase Occurrence # 219578
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| Date: | Sunday 16 December 2018 |
| Time: | 13:41 LT |
| Type: |  Mil Mi-8T |
| Owner/operator: | Yeltsovka Airlines |
| Registration: | RA-22649 |
| MSN: | 8096 |
| Year of manufacture: | 1980 |
| Fatalities: | Fatalities: 0 / Occupants: 25 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kedrovy City Industrial Zone, Tomsk Oblast -
 Russia
|
| Phase: | Landing |
| Nature: | Passenger |
| Departure airport: | Settlement 572 Mayskaya |
| Settlement Cedar | |
| Investigating agency: | MAK |
| Confidence Rating: |  Accident investigation report completed and information captured |
The Mi-8 rolled over after landing.
Conclusion:
The cause of the accident with Mi-8T helicopter RA-22649 was the track control failure, which was expressed in complete wear of the slots of the cup 246-1517-448 of the tail reducer stem assembly 246-1517-000 No. L90204106, which led to uncontrolled left rotation of the helicopter.
The cup 246-1517-448 was manufactured with deviations from the requirements of the drawing, as the surface of the cup slots was not hardened by nitro-cementation.
Wear of the cup slots was due to their work in pair with splines of the sleeve 246-1517- 446, the surfaces of which were hardened by nitriding.
With complete wear of the slits of the cup there was a breakdown of the kinematic connection, which led to the inability of the pilot to change the pitch of the tail rotor blades and compensation of the reactive torque NV. In the process of left rotation with increasing angular velocity and loss of altitude, the helicopter collided with the ground.
A contributing factor was the failure to check (during incoming inspection) the slotted cup 246-1517-448 for factory markings.
Accident investigation:
 |
|
Sources:
https://mak-iac.org/rassledovaniya/mi-8t-ra-22649-16-12-2018/
http://zapsib-sut.sledcom.ru/news/item/1282243/
https://www.interfax.ru/russia/642550
https://tvzvezda.ru/news/vstrane_i_mire/content/201812161206-8q58.htm
http://www.tomsk.ru/news/view/139029
https://russianplanes.net/reginfo/19998
Final report^ https://mak-iac.org/upload/iblock/a68/report_ra-22649.pdf
Images:
Ministry of Emergency Situations of Russia in Tomsk Region
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Dec-2018 14:23 | Hans GRuber | Added |
| 16-Dec-2018 14:25 | harro | Updated [Embed code, Narrative] |
| 16-Dec-2018 14:30 | harro | Updated [Operator, Location, Destination airport, Source, Photo] |
| 16-Dec-2018 17:49 | Inuki | Updated [Registration, Cn, Source] |
| 16-Dec-2018 19:00 | Hans GRuber | Updated [Time, Source] |
| 19-Dec-2018 19:35 | Hans GRuber | Updated [Aircraft type, Source] |
| 28-Mar-2020 18:23 | harro | Updated [Time, Departure airport, Destination airport, Narrative, Accident report, ] |
| 20-Jun-2022 13:04 | Hirurg | Updated [Source] |
| 20-Jun-2022 13:05 | harro | Updated [Narrative, Accident report] |
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