Plane crash AN-12B near Surgut, Tyumen CAA

• Date of the crash: 31.01.1971, the

• The time of the crash: 04: 41

• Country of the crash: the USSR

• Place the crash: Tyumen Region, Khanty-Mansi Autonomous, 13,6 km north of Surgut Airport

• Type of aircraft: An-12B

• Registration of aircraft: CCCP12996

• Name of air carrier Aeroflot (USSR)

• Division: Tyumen CAA, 2-th of Tyumen

Chronology of events: The plane crashed into the ground at 13,6 km north of Surgut airport with a huge left bank, collapsed completely burnt. Part of the debris was found at the bottom of the lake under ice. The tail half-sunk in an inverted position in the lake. The crew in the process of stalling tried to derive from a sharp decline by taking over the steering wheel with an overload of 1,8-1,9. In flight conditions, at which abnormal signs of the aircraft's behavior began to appear, the lift factor was equal to 0,96, that is, the overload margin to stall with a clean wing was 0,7. Therefore, the stalling took place due to a significant stiffening of the bearing properties of the wing as a result of distortion of the profile by deposition on the toe of the wing of the ice.

Data on victims:

• Total on board were people 7: 6 1 crew members and passengers. Total killed 7 people: crew 6, 1 passengers.

Details of the crash:

• Phase of flight: the approach

• Identify the causes of the crash: the shortcomings in the design, weather conditions

Data on the plane:

• aircraft Brand: An-12B

• Aircraft ID: CCCP-12996

• Country where registered aircraft: the USSR

• Date of manufacture of the aircraft: 31.08.1970

• Serial number of the aircraft: 00347403

• Hours aircraft: 391

• Engines: N 2026158 2036204 H H H 2026171 2026166

Flight data:

• Tour type: Truck

• The aviation company Aeroflot (USSR)

• Division: Tyumen CAA, 2-th of Tyumen

• The country, which was registered aviation company: USSR

• Flying from: Tyumen (Roschino)

• Flying in: Surgut

• Original item: Tyumen (Roschino)

• A final point: Surgut

Additional information:

Information about the crew:

• KBC Konstantin Adamovich 

• the co-pilot Viktor Ponomarev

• navigator Nikolai Mikhailovich Evlantev

• flight engineer Yuri A. Isakov

• radio operator Anatoly Sergeyevich Andreyev

• Flight Evgeny V. Trifonov