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Contents

   



(Top)
 


1 Accident  





2 Aircraft  





3 Investigation  





4 See also  





5 References  














Aeroflot Flight 1661






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Aeroflot Flight 1661
An Antonov An-24 similar to the accident aircraft
Accident
Date1 April 1970 (1970-04-01)
SummaryCollision with weather balloon
Site20 km southeast of Toguchin, Soviet Union
Aircraft
Aircraft typeAntonov An-24B
OperatorAeroflot
RegistrationCCCP-47751
Flight originTolmachevo Airport, Ob
StopoverYemelyanovo International Airport, Krasnoyarsk
DestinationBratsk Airport
Occupants45
Passengers40
Crew5
Fatalities45
Survivors0

Aeroflot Flight 1661 was a passenger flight operated by an Antonov An-24 that crashed during its initial climb, 25 minutes after take-off from Tolmachevo Airport on 1 April 1970. All 45 people on board perished. An investigation revealed that the Antonov collided with a radiosonde, causing a loss of control.

Accident

[edit]

Flight 1661 was a scheduled domestic flight from NovosibirsktoBratsk, Russia, with an intermediate stop at Krasnoyarsk. At 03:42 local time the An-24 departed Tolmachevo Airport from runway 25 on a heading of 251°. Shortly after take-off, the aircraft made a turn to the left, and at 03:53 contacted air traffic control (ATC) and reported their altitude as 4,200 meters. They then received clearance to continue climbing to 6,000 meters. At 04:10 ATC attempted to contact flight 1661, but no further transmissions from the Antonov were received. The crashed aircraft was found in a field approximately 142 km from Tolmachevo Airport; there were no survivors. Among the victims were the members of a youth ice hockey team, who were flying to a game.[1]

Aircraft

[edit]

The Antonov An-24 involved was serial numbered 79901204 and registered as CCCP-47751 to Aeroflot. The airliner was built in 1967, and had compiled 3,975 flight hours with 3,832 take-off and landing cycles at the time of the crash.[2][1][3]

Investigation

[edit]

Investigators examining the crash site discovered unusual damage to the aircraft's radome and nose structure, and noticed that a substantial portion of the windshield was missing. Also found among the wreckage were parts of two radiosondes of the type then being used by the Federal Service for Hydrometeorology and Environmental Monitoring of Russia for the monitoring of meteorological conditions. Investigators also discovered parts of the aircraft's nose cone six km away from the main crash site; these components displayed evidence of collision with a solid object. Officials concluded that the accident was caused by a collision in flight with a foreign object: the radiosonde/balloon assembly.[2]

The investigation concluded that the aircraft's nose cone collided with a radiosonde, at a distance of 131 km from Tolmachevo, while ascending through 5,400 meters. The collision destroyed the aircraft's weather radar and damaged the cockpit. Out of control, the Antonov nosed over and began to descend rapidly. At an altitude of 2,000 meters and a speed of 700 km/h, the wing and horizontal stabilizer separated from the aircraft due to aerodynamic forces well beyond the plane's design limits. The fuselage then continued 2.5 km before striking the ground at 300 km/h and a vertical speed of 60 m/sec. The flight lasted 25 minutes, 25 seconds.[2][1][3]

See also

[edit]
  • flag Russia
  • icon 1970s
  • Aviation
  • References

    [edit]
    1. ^ a b c "Accident description Wednesday 1 April 1970". aviation-safety.net. Retrieved 2018-07-21.
  • ^ a b c "An-24B catastrophe of the West-Siberian UGA in the Toguchin area". airdisaster.ru (in Russian). Retrieved 2018-07-21.
  • ^ a b "Accident Details April 1, 1970". planecrashinfo.com. Retrieved 2018-07-21.

  • Retrieved from "https://en.wikipedia.org/w/index.php?title=Aeroflot_Flight_1661&oldid=1227958108"

    Categories: 
    Accidents and incidents involving the Antonov An-24
    Aviation accidents and incidents in 1970
    Aviation accidents and incidents in the Soviet Union
    20th-century aviation accidents and incidents in Russia
    Aeroflot accidents and incidents
    1970 disasters in the Soviet Union
    Disasters in Russia
    Hidden categories: 
    CS1 Russian-language sources (ru)
    Articles with short description
    Short description matches Wikidata
     



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