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Last updated: 14 June 2021
Statuts:Enquête Officielle
Date:mardi 27 mars 1990
Heure:11:30
Type/Sous-type:Silhouette image of generic IL76 model; specific model in this crash may look slightly different
Iliouchine Il-76MD
Opérant pour:Uzbek Civil Aviation Adminstration
Loué à :Soviet Air Force
Immatriculation: CCCP-78781
Numéro de série: 0083489670
Année de Fabrication: 1988
Heures de vol:1233
Cycles:925
Equipage:victimes: 9 / à bord: 9
Passagers:victimes: 0 / à bord: 0
Total:victimes: 9 / à bord: 9
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:7,6 km (4.8 milles) E of Kabul Airport (KBL) (   Afghanistan)
Phase de vol: En approche (APR)
Nature:Cargo
Aéroport de départ:Kokand Airport (UTKK), Ouzbékistan
Aéroport de destination:Kabul Airport (KBL/OAKB), Afghanistan
Numéro de vol:3501
Détails:
The Ilyushin Il-76MD transport plane operated on a cargo flight to deliver goods from Tashkent, Uzbekistan, to Kabul, Afghanistan. An en route stop was made at Kokand, Uzbekistan. The flight departed at 10:36 hours and climbed to the en route altitude of FL270.
At 11:20 hours the aircraft was cleared to descend FL250 and subsequently to FL230. During the descent the flaps were set at 30° and the spoilers at 20°. The aircraft was then cleared to descend to FL190, after which the controller instructed the flight to maintain that altitude as an Afghanistan Air Force Antonov An-32 was crossing at FL180.
This delayed the descent and the flight leveled off at FL190. Subsequently the flight was cleared down to FL140 and to position for the final approach. At 11:30 the aircraft stalled and rolled left, entering a steep descending spiral. It struck the ground inverted.

Probable Cause:

The stall of an airplane during maneuvering occurred as a result of a combination of the following factors:
- crew failure to maintain flight speed modes recommended by IL-76 for various airplane configurations, which reduced the available margin of angle of attack to critical modes;
- insufficient control of crew members over the determining flight parameters, which led to a violation of the established restrictions on the permissible angle of attack and the minimum flight speed;
- the lack of piloting skills at high angles of attack, due to the imperfection of the training system for crews in special flight situations;
- the pilots were unable to recognize the exit to critical angles of attack and implement the IL-76 recommendations to prevent stall;
- the need for maneuvering according to the descent scheme in combat conditions at close to flight restriction conditions and the presence of three aircraft flying in clouds at short intervals without appropriate radar control created a difficult situation for the crew, which was aggravated after the controller informed about the need to temporarily stop the descent in connection with the take-off of the An-32 aircraft, which led to a change in the prevailing stereotype of crew actions.

Sources:
» Soviet Transports
» Andrei Bezmylov
» ICAO Adrep Summary 3/91 (#29)


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Plan
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 Kokand Airport et Kabul Airport est de 677 km (423 miles).
Accident location: Approximate; accuracy within a few 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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