Aeroflot Flight 7425

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Aeroflot Flight 7425
An Aeroflot Tupolev Tu-154B-2 similar to the one involved in the accident is seen here at Zürich Airport in 1982.
Accident summary
Date 10 July 1985
Summary Pilot error
Site Uchkuduk, Uzbek SSR, Soviet Union
42°9′24″N 63°33′20″E / 42.15667°N 63.55556°E / 42.15667; 63.55556Coordinates: 42°9′24″N 63°33′20″E / 42.15667°N 63.55556°E / 42.15667; 63.55556
Passengers 191
Crew 9
Injuries (non-fatal) 0
Fatalities 200
Survivors 0
Aircraft type Tupolev Tu-154B-2
Operator Aeroflot
Registration CCCP-85311
Flight origin Tashkent Airport
1st stopover Karshi Airport
2nd stopover Orenburg Airport
Destination Pulkovo Airport

Aeroflot Flight 7425[nb 1] refers to a Tupolev Tu-154B-2, registration CCCP-85311, that was operating a domestic scheduled TashkentKarshiOrenburgLeningrad passenger service under the airline's Uzbekistan division, that crashed near Uchkuduk, Uzbek SSR, Soviet Union, while en route its second leg. The crash killed all 200 occupants on board.[2][3]

Description of the accident[edit]

The aircraft was covering the second leg of the flight, cruising at an altitude of 11,600 metres (38,100 ft) with an airspeed of only 400 kilometres per hour (250 mph), close to stalling speed for that altitude. The low speed caused vibrations which the aircrew incorrectly assumed were engine surges. Using the thrust levers to reduce engine power to flight idle, the crew caused a further drop in airspeed to 290 km/h (180 mph). The aircraft stalled and entered a flat spin, crashing into the ground near Uchkuduk, Uzbekistan, at that time in the Soviet Union. There were no survivors among the 191 passengers and the 9 crewmen.[2]

It is the deadliest air disaster in Soviet and Uzbek aviation history, and as of February 2012 has the highest worldwide death toll of any accident involving a Tupolev Tu-154.[2]

Cause[edit]

Flight 7425's cockpit voice recorder was destroyed in the crash. Investigators with the help of psychologists studied the human factors that led to the aviation incident. Their findings were that Flight 7425's flight crew were very fatigued at the time of the crash due to their having to spend 24 hours at the departure airport prior to takeoff. Another factor in the crash was inadequate regulations for crews encountering abnormal conditions.[4]

See also[edit]

Notes[edit]

  1. ^ A Russian source claims the flightnumber was ″5143″.[1]

References[edit]

  1. ^ "Accident Description from airdisaster.ru". 
  2. ^ a b c Accident description at the Aviation Safety Network. Retrieved on 28 September 2011.
  3. ^ "Accident synopsis". AirDisaster.Com. Retrieved 19 February 2012. 
  4. ^ Gero, David (1996). Aviation Disasters Second Edition. Patrick Stephens Limited. p. 187.