Aeroflot Flight 1661

Aeroflot Flight 1661
	An Antonov An-24 similar to the accident aircraft
Accident
Date	1 April 1970
Summary	Collision with weather balloon
Site	20 km southeast of Toguchin
Aircraft
Aircraft type	Antonov An-24B
Operator	Aeroflot
Registration	CCCP-47751
Flight origin	Tolmachevo Airport, Ob
Stopover	Yemelyanovo International Airport, Krasnoyarsk
Destination	Bratsk Airport
Occupants	45
Passengers	40
Crew	5
Fatalities	45
Survivors	0

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

Flight 1661 was a scheduled domestic flight from Novosibirsk to Bratsk, 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.

At a distance of 131 km from Tolmachevo, while ascending through 5,400 meters, the aircraft's nose cone collided with a radiosonde, destroying the aircraft's weather radar and damaging 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; the crash site was in a field approximately 142 km from Tolmachevo Airport.[1][2][3]

Aircraft

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.[1][2][3]

Investigation

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).[1]

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gollark: I mean, I guess it depends on how you define with "you".

gollark: Again, you don't really *choose* beliefs.

gollark: Basically, they have some weird thing going on where they kind of sort of believe it because they kind of sort of believe they'll go to hell otherwise, I think.

gollark: You don't exactly control your beliefs, you know.

References

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

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[airu-1] "An-24B catastrophe of the West-Siberian UGA in the Toguchin area". airdisaster.ru (in Russian). Retrieved 2018-07-21.

[avasf-2] "Accident description Wednesday 1 April 1970". aviation-safety.net. Retrieved 2018-07-21.

[pla-3] "Accident Details April 1, 1970". planecrashinfo.com. Retrieved 2018-07-21.

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Aeroflot Flight 1661

Accident

Aircraft

Investigation

See also

References