Aeroflot aircraft accident near Khanty-Mansiysk in 1986

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Aeroflot aircraft accident near Khanty-Mansiysk in 1986
Yakovlev Yak-40, Aeroflot AN1083660.jpg

Identical aircraft of the airline
Accident summary
Accident type Structural overload
place 19 km northwest of Khanty-Mansiysk Airport , Russian SFSRRussia Soviet Federal Socialist RepublicRussian SFSR 
date May 17, 1986
Fatalities 5
Survivors 0
Aircraft
Aircraft type Jakowlew Jak-40 , Soviet UnionSoviet Union 1955Soviet Union 
operator Aeroflot , Soviet UnionSoviet Union 1955Soviet Union 
Mark CCCP-87928, Soviet UnionSoviet Union 1955Soviet Union 
Departure airport Khanty-Mansiysk Airport, Russian SFSRRussia Soviet Federal Socialist RepublicRussian SFSR 
Destination airport Khanty-Mansiysk Airport, Russian SFSRRussia Soviet Federal Socialist RepublicRussian SFSR 
Passengers 0
crew 5
Lists of aviation accidents

On May 17, 1986, the Aeroflot accident occurred near Khanty-Mansiysk when a Yak-40 was supposed to complete a test flight, with all 5 occupants dying.

Plane and crew

The plane was a 9 year old Yakovlev Yak-40 ( air vehicle registration number : CCCP-87928; Serial Number : 9741955), with 3 turbofan engines of the type Iwtschenko AI-25 was equipped. The front landing gear was repaired before the accident .

A flight was requested for control and the subsequent crew was appointed, consisting of the flight captain Sergei Anatoljewitsch Chomjakow, the first officer Igor Jurjewitsch Laletin, the flight engineer Pavel Agapowitsch Weschkurzew, the engineer WW Nabokich and the aircraft mechanic PA Orlov

Since the flight was not planned, the crew was not prepared and there was no flight plan . This was created by Captain Khomyakov, who arbitrarily entered an altitude of 7,800 m, which was approved by the air traffic controller as this corresponded to a normal training flight.

course

At 15:36 Moscow time (MSK) / 17:36 local time , the Yak-40 took off. Shortly afterwards, the pilots requested the climb to 7,800 m, which was not in the sense of the requested control flight . At 3:48 p.m. they reported an altitude of 6,000 m and asked for permission to carry out the job within 5 minutes. The crew then flew left turns with a roll angle of between 25 and 50 ° and right turns with a 60 ° angle at that altitude . During these maneuvers, the acceleration did not exceed 2 g and a displayed speed of 380-390 km / h ( IAS ) was maintained. The aircraft, with its engines running at 91% thrust, hardly lost any altitude.

At 15:56:56, the Jak-40, which had been slowed down to 360 km / h, was gently aligned horizontally (1.5 g ). Shortly afterwards at 3:57:10 p.m., actuation of the ailerons by 8.5 ° and the rudder by 8 ° initiated a steep right turn. Within 8 seconds the aircraft flew upside down and the 3–5 ° actuated elevators turned it into a dive , during which it sank by up to 100 m / s. When reaching 470 km / h IAS the engines were throttled to 73%. At 15:57:31 h the aircraft had completed a complete barrel roll and brought aileron and rudder to neutral. In the following 3 seconds the dive was ended at 4,500 m. In between, a speed of 620 km / h IAS and an acceleration of 5.25 g were achieved, which was above the operating limits of the Jak-40 for speed (500 km / h IAS) and acceleration (3.4 g ). As a result, the left wing broke off, which in turn tore off the entire tail. Before the impact, parts of the right wing tore off, including the landing flaps .

The wreck was finally found the next day at 6:00 a.m. MSK / 8:00 a.m. local time in a river bed on the Obs .

Investigations

Investigators came to the conclusion that the accident was caused by gross violations

  1. by pilots by flying unauthorized maneuvers that overloaded the aircraft
  2. on the part of the airline due to inadequate flight planning and monitoring. This was exacerbated by the inadequate training, organization and flight control at the airport

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