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]

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.

Aviation accidents and incidents in the Soviet Union and Russia
1950s	1950 Sverdlovsk plane crash Aeroflot Flight 4 1958 Aeroflot Tu-104 Kanash crash Aeroflot Flight 315 (1959) Aeroflot Flight 120
1960s	Aeroflot Flight 315 (1960) Aeroflot Flight 207 Austrian Airlines Flight 901 Aeroflot Flight 68 Aeroflot Flight 245 Aeroflot Flight 902 Aeroflot Flight 415 Aeroflot Flight 191 Aeroflot Flight 3 Aeroflot Flight 25 Aeroflot Flight 12 CCCP-45021 Aeroflot Flight 663 Aeroflot Flight 721 Aeroflot Flight 20 Aeroflot Flight 513 Aeroflot Flight 99 Aeroflot Flight 65 Aeroflot Flight 2723 Aeroflot Flight 5003 (1967) Aeroflot Flight 2230 Aeroflot Flight 51 Aeroflot Flight 15 Aeroflot Flight 831 Aeroflot Flight 826 1969 Yukhnov mid-air collision
1970s	Aeroflot Flight U-45 Aeroflot Flight 1661 CCCP-11000 CCCP-12996 Aeroflot Flight 1969 Aeroflot Flight 1912 Malév Flight 110 Aeroflot Flight 773 Aeroflot Flight 2174 Aeroflot Flight 1491 Aeroflot Flight 558 Aeroflot Flight 1036 Aeroflot Flight 217 Japan Airlines Flight 446 Aeroflot Flight 6263 Aeroflot Flight 141 Aeroflot Flight 630 Balkan Bulgarian Airlines Flight 307 Aeroflot Flight 6551 Aeroflot Flight 109 Aeroflot Flight 13 Aeroflot Flight 3932 Aeroflot Flight 964 Aeroflot Flight 19 Aeroflot Flight 2022 CCCP-75559 1974 Surgut mid-air collision Aeroflot Flight 2003 Aeroflot Flight 3739 (1976) Aeroflot Flight 909 Aeroflot Flight 1802 Aeroflot Flight 418 1976 Anapa mid-air collision Aeroflot Flight 2415 Aeroflot Flight 36 (1976) Aeroflot Flight 3843 Aeroflot Flight 5003 (1977) Aeroflot Flight 331 CCCP-65639 Aeroflot Flight 2 Aeroflot Flight 6709 Korean Air Lines Flight 902 Aeroflot Flight 1080 Aeroflot Flight 1691 1979 Dniprodzerzhynsk mid-air collision Aeroflot Flight 5484
1980s	Aeroflot Flight 4225 1981 Pushkin Tu-104 crash Aeroflot Flight 498 1981 Armenia mid-air collision Aeroflot Flight 811 Aeroflot Flight 3603 Aeroflot Flight 8641 Aeroflot Flight 411 Aeroflot Flight 343 Aeroflot Flight 5463 Aeroflot Flight 601 Aeroflot Flight 3352 Aeroflot Flight 3519 Aeroflot Flight 7841 Aeroflot Flight 8381 Aeroflot Flight 7425 Aeroflot Flight 101/435 Aeroflot Flight 2306 Aeroflot Flight 6502 Aeroflot Flight 892 Aeroflot Flight 505 Aeroflot Flight 528 Aeroflot Flight 3739 (1988) Korean Air Lines Flight 007
1990s	Aeroflot Flight 2808 (1992) Sakha Avia Flight 301 (1993) Aeroflot Flight 593 (1994) Stavropolskaya Aktsionernaya Avia Flight 1023 (1997)
2000s	Vladivostok Air Flight 352 (2001) Siberia Airlines Flight 1812 (2001) Pulkovo Aviation Enterprise Flight 9560 (2002) 2004 Russian aircraft bombings (2004) Armavia Flight 967 (2006) S7 Airlines Flight 778 (2006) Aeroflot Flight 821 (2008)
2010s	Smolensk air disaster (2010) Dagestan Airlines Flight 372 (2010) Kolavia Flight 348 (2011) RusAir Flight 9605 (2011) Lokomotiv Yaroslavl plane crash (2011) Red Wings Airlines Flight 9268 (2012) Tatarstan Airlines Flight 363 (2013) 2014 Vnukovo Airport Falcon 50 crash (2014) Metrojet Flight 9268 (2015) Flydubai Flight 981 (2016) 2016 Russian Defence Ministry Tupolev Tu-154 crash (2016) Khabarovsk Airlines Flight 463 (2017) Saratov Airlines Flight 703 (2018) Aeroflot Flight 1492 (2019) Ural Airlines Flight 178 (2019)
2020s	Volga-Dnepr Airlines Flight 4066 (2020)

Aeroflot Flight 1661

Accident

Aircraft

Investigation

See also

References