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ASN Wikibase Occurrence # 140488
Last updated: 2 August 2019
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Date:20-DEC-2011
Time:03:30 LT
Type:Silhouette image of generic MI26 model; specific model in this crash may look slightly different
Mil Mi-26T
Owner/operator:Nefteyugansk JAE
Registration: RA-06121
C/n / msn: 34001212305
Fatalities:Fatalities: 1 / Occupants: 6
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:30 km from Taylakovo, Tyumen Oblast -   Russia
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Cargo
Departure airport:
Destination airport:
Narrative:
The helicopter was carrying 15 tons of diesel fuel to Ustj-Tegusskoe. Load carried on rope under fuselage touched the treetops on approach to landing causing the tail boom of helicopter to droop off in the air at a height of 50 meters during landing. The helicopter started to rotate and crashed on the left side. The cockpit fell off from the fuselage. The helicopter burned out. Pilots and crew in cockpit survived with medium to serious injuries, load operator died.

The cause was high cycle fatigue. Fatigue cracks were not identified during the helicopter maintenance.
IAC say contributing factors could be:
- defects of helicopter manufacture and maintenance work in the area of stringer № 2 at the frame № 33 that could cause the cracks initiation before;
- abnormal (violation of FOM and AMM regulations) external load that could accelerate initiation and development of cracks during exploitation of this load.

Sources:

http://www.xinhuanet.com/english/world/2011-12/20/c_131316928.htm
https://russianplanes.net/reginfo/23499
http://www.lifenews.ru/news/77475 (photo)
http://www.forumavia.ru/forum/7/5/5027605775501833530741324357575_1.shtml?topiccount=27
http://aviaforum.ru/attachment.php?attachmentid=284988&d=1324624347 (place of crash)
https://mak-iac.org/en/rassledovaniya/mi-26t-ra-06121-20-12-2011


Revision history:

Date/timeContributorUpdates
20-Dec-2011 00:18 Steinmann Added
20-Dec-2011 01:25 krasatpi Updated [Date, Aircraft type, Registration, Cn, Operator, Total occupants, Other fatalities, Location, Phase, Nature, Source, Damage, Narrative]
20-Dec-2011 03:47 krasatpi Updated [Total occupants, Location, Narrative]
20-Dec-2011 09:01 krasatpi Updated [Time, Location, Source, Narrative]
20-Dec-2011 10:31 Anon. Updated [Narrative]
23-Dec-2011 09:19 krasatpi Updated [Source]
25-Jan-2016 21:02 Aerossurance Updated [Source, Narrative]

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