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Last updated: 22 October 2020
Status:Schlussbericht
Datum:Mittwoch 10 Oktober 2018
Zeit:03:21
Flugzeugtyp:Silhouette image of generic SU95 model; specific model in this crash may look slightly different
Sukhoi Superjet 100-95B
Fluggesellschaft:Yakutia Airlines
Kennzeichen: RA-89011
Werknummer: 95019
Baujahr: 2012-08-13 (6 years 2 months)
Betriebsstunden:8115
Anzahl Zyklen der Zelle:3320
Triebwerk: 2 PowerJet SaM146
Besatzung:Todesopfer: 0 / Insassen: 5
Fluggäste:Todesopfer: 0 / Insassen: 87
Gesamt:Todesopfer: 0 / Insassen: 92
Sachschaden: schwer beschädigt
Konsequenzen: Written off (damaged beyond repair)
Unfallort:Yakutsk Airport (YKS) (   Russland)
Flugphase: Landung (LDG)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Ulan-Ude Airport (UUD/UIUU), Russland
Flug nach:Yakutsk Airport (YKS/UEEE), Russland
Flugnummer:R3414
Unfallbericht:
Yakutia Airlines flight 414, a Sukhoi Superjet, suffered a collapse of the main landing gear in a landing accident at Yakutsk Airport, Russia.
Yakutsk Airport's runway 05R threshold was displaced by 1150 meters due to reconstruction. Runway 23L was available for landing only with a Landing Distance Available (LDA) of 2248 meters. Additionaly, the touchdown zone lights of runway 23L and runway centreline lights were unserviceable.
Flight 414 touched down on runway 23L following an NDB approach. Wind was reported to be from 060° at 2 m/s, resulting in a 4 knot tailwind component. A runway friction coefficient of 0.45 was communicated to the flight.
The aircraft failed to stop on the remaining runway and overran onto the area that was under reconstruction, stopping after 250 meters. This caused damage to the forward fuselage, separation of both main landing gear bogies and a fuel tank leak.
After the accident, a measurement showed friction coefficients of 0.25, 0.32, and 0.25 on the runway.
The aircraft was dispatched with a deactivated thrust reverser on engine no.2. According to the limitations of the minimum equipment list (MEL), landing with deactivated engine reversers is allowed at a friction coefficient of not less than 0.4.

Probable Cause:

Conclusion:
The cause of the aviation accident with the RRJ 95B RA-89011 aircraft when landing at night with one deactivated thrust reverser was the transfer to the crew of incorrect information about the value of the friction coefficient, which led to the landing on an icy runway, the average normative friction coefficient which was less than 0.3, which did not allow landing in accordance with current regulations. This led to a significant increase in landing distance, rolling the aircraft out of the runway and collision with the junction of the reconstructed section of the runway with a height of about 0.4 m, which led to the destruction of the main landing gear supports and damage to the engines with fuel leakage without causing a fire.

The contributing factors were the following:
- Absence of a connecting ramp (which was not envisaged by the reconstruction project) between the current and the part of the runway being reconstructed;
- inefficiency of the SMS of Yakutsk Airport JSC in terms of identification and control of risks associated with the possibility of ice formation at the runway, and insufficient control over the implementation of the SMS by aviation authorities;
- erroneous determination of the Xc value at the last measurement;
- inefficiency of ice removal procedure during runway cleaning due to lack of chemical reagents for ice removal and/or thermal machines at the airfield;
- lack of information from the RRJ-95LR-100 RA 89038 aircraft crew about actual rolling out of the runway, which was an aviation incident and was subject to investigation;
- failure by airport and ATC officials to take appropriate action after receiving the RRJ-95LR-100 RA-89038 low friction report from the aircraft crew.

Accident investigation:
cover
Investigating agency: MAK
Status: Investigation completed
Duration: 2 years
Accident number: final report
Download report: Final report

METAR Weather report:
18:00 UTC / 03:00 local time:
UEEE 091800Z 05002MPS 9999 BKN020CB M03/M04 Q1012 R23L/590145 NOSIG RMK QFE750

18:30 UTC / 03:30 local time:
UEEE 091830Z 05003MPS 9999 BKN020CB M03/M04 Q1012 R23L/590145 NOSIG RMK QFE750

19:00 UTC / 04:00 local time:
UEEE 091900Z 06003MPS 9999 BKN015CB M03/M05 Q1012 R23L/590145 NOSIG RMK QFE750


Sicherheitsempfehlungen

UEEE issued 1 Notice to Airmen (Notam)

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Fotos

photo of Sukhoi-Superjet-100-95B-RA-89011
accident date: 10-10-2018
type: Sukhoi Superjet 100-95B
registration: RA-89011
photo of Sukhoi-Superjet-100-95B-RA-89011
accident date: 10-10-2018
type: Sukhoi Superjet 100-95B
registration: RA-89011
photo of Sukhoi-Superjet-100-95B-RA-89011
accident date: 10-10-2018
type: Sukhoi Superjet 100-95B
registration: RA-89011
photo of Sukhoi-Superjet-100-95B-RA-89011
accident date: 10-10-2018
type: Sukhoi Superjet 100-95B
registration: RA-89011
 

Video, social media

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Ulan-Ude Airport to Yakutsk Airport as the crow flies is 1744 km (1090 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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