Accident
Last updated: 2 October 2014
Status:
Datum:Mittwoch 21 Mai 1986
Zeit:15:21
Flugzeugtyp:Tupolew 154B-2
Fluggesellschaft:Aeroflot, Krasnoyarsk Civil Aviation Directorate
Kennzeichen: CCCP-85327
Werknummer: 79A-327
Baujahr: 1979
Betriebsstunden:11922
Anzahl Zyklen der Zelle:4687
Triebwerk: 3 Kuznetsov NK-8-2U
Besatzung:Todesopfer: 0 / Insassen:
Fluggäste:Todesopfer: 0 / Insassen: 175
Gesamt:Todesopfer: 0 / Insassen:
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:Moskva-Sheremetyevo Airport (SVO) (   Russland) show on map
Flugphase: Während des Fluges (ENR)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Chelyabinsk Airport (CEK/USCC), Russland
Flug nach:Moskva-Domodedovo Airport (DME/UUDD), Russland
Unfallbericht:
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.

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.

Informationsquelle:
» Soviet Transports


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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 Chelyabinsk Airport to Moskva-Domodedovo Airport as the crow flies is 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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