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Last updated: 5 August 2021
Status:
Datum:woensdag 21 mei 1986
Tijd:15:21
Type:Silhouette image of generic T154 model; specific model in this crash may look slightly different
Tupolev Tu-154B-2
Luchtvaartmaatschappij:Aeroflot, Krasnoyarsk Civil Aviation Directorate
Registratie: CCCP-85327
Constructienummer: 79A327
Bouwjaar: 1979
Aantal vlieguren:11922
Aantal vluchten:4687
Motoren: 3 Kuznetsov NK-8-2U
Bemanning:slachtoffers: 0 / inzittenden:
Passagiers:slachtoffers: 0 / inzittenden: 175
Totaal:slachtoffers: 0 / inzittenden:
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:Moskva-Sheremetyevo Airport (SVO) (   Rusland)
Fase: Kruisvlucht (ENR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Chelyabinsk Airport (CEK/USCC), Rusland
Vliegveld van aankomst:Moskva-Domodedovo Airport (DME/UUDD), Rusland
Beschrijving:
Prior to takeoff from Chelyabinsk the crew forgot to activate the pitot heating system. The departure and en route part of the flight were uneventful until the flight was descending for Domodedovo. At an altitude of 3600 m the Tu-154 passed a zone of heavy rainfall and icing. This caused blocking of the pitot tube and incorrect airspeed indications. The airspeed indicator soon went down to zero. The crew mistakenly thought the aircraft was about to stall. They immediately entered a steep descent with the engines at takeoff power. Then aircraft was levelled again at a height of 800 meters. The descent had been flown at a maximum of 100 m/s at a high speed of 813 km/h. The airplane pulled 3.2 G in the process. The high loads on the airframe caused substantial structural damage. The airplane landed safely at Domodedovo.

Probable Cause:

Conclusion
By the reason for emergency were improper actions of crew for the piloting during the distorted indications of the indicators of the indicated speed in icing conditions because of not the start it heating PPD, which led to the recovery to the uncalculated flight conditions.

Bronnen:
» Soviet Transports


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Chelyabinsk Airport en Moskva-Domodedovo Airport bedraagt 1473 km (921 miles).

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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