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Last updated: 22 September 2021
Date:jeudi 13 janvier 1977
Type/Sous-type:Tupolev Tu-104A
Compagnie:Aeroflot, Far East Civil Aviation Directorate
Immatriculation: CCCP-42369
Numéro de série: 86601203
Année de Fabrication: 1958
Heures de vol:27189
Moteurs: 2 Mikulin AM-3M
Equipage:victimes: 8 / à bord: 8
Passagers:victimes: 82 / à bord: 82
Total:victimes: 90 / à bord: 90
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:3,5 km (2.2 milles) NE of Alma-Ata Airport (ALA) (   Kazakhstan)
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Novosibirsk-Tolmachevo Airport (OVB/UNNN), Fédération de Russie
Aéroport de destination:Alma-Ata Airport (ALA/UAAA), Kazakhstan
Numéro de vol:3843
The Tupolev Tu-104A took off from Novosibirsk Airport at 17:19 hrs local time and climbed to the cruising altitude of 8400 m. The en route part of the flight was uneventful. After receiving descent and course instructions from the air traffic controller, the flight crew began the approach to Alma-Ata Airport.
At a distance of 12.5 km to the runway, a slow drop in power of the no.1 engine occurred as the flaps were selected down to 35°. The crew detected the abnormal operation of the engine and started raising the flaps up to 20°. At the distance of 8 km to the runway, the crew reported: "Come in on one engine, left engine failed." They subsequently shut down the engine and increased power on the remaining engine.
The aircraft then deviated to the left of the planned approach course. The crew then radioed two incomprehensible words. This was the last contact. The crew did not answer the following calls. At distance of 3.5 km from the runway, the aircraft abruptly climbed from 195 m to 285 m, at a critical angle of attack. The aircraft then sank and impacted a flat, snow-covered field 3280 m from the end of runway 23 and 480 m to the left of its extended centreline. It broke up and burst into flames.

An investigation concluded that a fire had broken out in the area of the left engine some 10-15 minutes before the accident. There flight crew was not aware of this fire.

Probable Cause:

The cause of the accident was the fire that occurred on the aircraft in the air in the area of the left engine due to a fuel leak due to the destruction of a fuel line. The fuel line failed because it was subjected to hot air from a pipeline that was not properly fastened. The consequence of the fire was a disturbance in the controllability of the aircraft, carbon monoxide poisoning of the crew and creation of rear centre of gravity as a result of possible movement of passengers as a result of panic.
The source of carbon monoxide emissions was the thermal insulation materials of the aircraft fuselage when exposed to high temperatures.

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Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Novosibirsk-Tolmachevo Airport et Alma-Ata Airport est de 1348 km (843 miles).
Accident location: Global; accuracy within tens or hundreds of kilometers.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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