Loss of control Accident Ilyushin Il-76MD CCCP-78781, Tuesday 27 March 1990
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Date:Tuesday 27 March 1990
Time:11:30
Type:Silhouette image of generic IL76 model; specific model in this crash may look slightly different    
Ilyushin Il-76MD
Owner/operator:Uzbek Civil Aviation Adminstration, lsf Soviet Air Force
Registration: CCCP-78781
MSN: 0083489670
Year of manufacture:1988
Total airframe hrs:1233 hours
Cycles:925 flights
Fatalities:Fatalities: 9 / Occupants: 9
Other fatalities:0
Aircraft damage: Destroyed, written off
Category:Accident
Location:7,6 km E of Kabul Airport (KBL) -   Afghanistan
Phase: Approach
Nature:Cargo
Departure airport:Kokand Airport (UTKK)
Destination airport:Kabul Airport (KBL/OAKB)
Confidence Rating: Accident investigation report completed and information captured
Narrative:
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.

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)

Statistics

  • 49th worst accident in 1990
  • 25th worst accident of this aircraft type
  • 6th worst accident of this aircraft type at the time

Location

Revision history:

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