Air crash An-24B Bykovskogo OAO near Bugulma

2018-01-18

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· Date of the crash: November 02.03.1986, XNUMX

· Time of the crash: 03:04

· Country of the crash: the USSR

· Location of the crash: Tatar ASSR, 8 km north of the airport Bugulma

· aircraft Brand: An-24B

· Registration of aircraft: CCCP46423

· Name of air carrier: Aeroflot (USSR)

· Subdivision: UGATS, of Bykovskii

· Flight: F-77

Chronology of events:

The rudder did not actually deviate, but was kept in a neutral position, and the unfolding moment did not parry. After 3 seconds after the deflection of the ailerons, the left roll decreased to 9 degrees and, due to a significant developed slip angle, there was a tendency to decrease the flight speed. In order to keep it the steering wheel deviated from itself by 6 degrees for a dive, but such a deviation was not enough to maintain flight speed and crew. before the collision with the ground in 18 seconds, without transferring, in accordance with the requirements of the RLE, the aircraft from the left to the right bank, set the take-off mode to the engine running. An increase in the second engine's regime helped to stop the aircraft from leaving the left bank, and then increasing the bank (more than 50 degrees), pitching and sliding angles. Due to the increase in slip angles, when there is no parrying with the rudder, the drag becomes larger than 1,5 times, which caused a decrease in the flight speed. The crew for 10 seconds before the end of the recording MSRP aileron rejected completely and at 9 degrees the rudder in order to take the plane out of the turn and roll, but these actions were belated. The flight path by that time changed by 50 degrees from the original, the slip angle was 18-21 degrees, the flight speed was 155 km / h. The stalling of the aircraft took place at a speed of 140 km / h with an increase in further roll to 110 degrees. In a collision in 03: 04 Moscow time with the ground, which took place on a snow-covered field at a distance of 8 km from the end of the strip with azimuth 15 ° (from the axis of the 500 band m), flight speed 320 km / h, course 15 degrees, vertical speed of descent to 40 m / s, pitch angle 40 degrees and left roll 3 degrees. The plane collapsed completely. The debris scatter was 136x40 m. There was no fire.

Data on victims:

· There were 38 people on board: 4 crew members and 43 passengers. Number of people killed 38: 4 crew members, 34 passengers.

· Details of the crash: Phase of flight: the approach

Revealed causes of the plane crash: crew error, equipment failure, design flaws

Data on the plane:

Aircraft make: An-24B

Aircraft ID: CCCP46423

The country in which the aircraft was registered: USSR

Aircraft production date: 20.02.1968/XNUMX/XNUMX

Aircraft serial number: 87304108

Aircraft operating hours: 31570

Aircraft operating cycles: 23765