Aeroflot Flight 1661 - Misplaced Pages

1970 aviation accident in the Soviet Union

Aeroflot Flight 1661
Accident
An Antonov An-24 similar to the accident aircraft
Date	1 April 1970 (1970-04-01)
Summary	Collision with weather balloon
Site	20 km southeast of Toguchin, Soviet Union
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. 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.

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.

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 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.

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.

References

^ "Accident description Wednesday 1 April 1970". aviation-safety.net. Retrieved 2018-07-21.
^ "Accident Details April 1, 1970". planecrashinfo.com. Retrieved 2018-07-21.
"Crash of an Antonov An-24B near Toguchin: 45 killed". B3A Archives.

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Fleet

Accidents and
incidents

1940s	G-2 Alma-Ata crash ANT-20bis crash CCCP-Л1450 crash Flight 17
1950s	Il-12 Karaganda crash Il-12 Novosibirsk crash Kemerovo mid-air collision Flight 229 Flight 783 Flight 10 Flight 136 Flight 214 Flight 229 Kiev mid-air collision Flight 11 Flight 10 Flight 105 Flight 04 Flight 365 Flight 164 Il-12 Lazo crash Тu-104 Kanash crash Flight 200 Flight 315
1960s	Flight 315 Flight 207 Flight 036 Flight 068 Flight 245 Flight 902 Flight 415 Flight 03 Flight 213 Flight 191 Flight 25 Flight 012 Flight 366 Flight 663 Flight 721 Flight 101/X-20 Flight 542 Flight 513 Flight 99 Flight 065 Flight 2723 Flight 5003 Flight 2230 Flight L-51 Flight 1668 Flight 15 Flight 831 Flight F-28 Flight N-826
1970s	Flight U-45 Flight 1661 Flight 3630 CCCP-11000 crash CCCP-12996 crash Flight 1969 Flight 1912 Flight 773 Flight N-63 Flight 2174 Flight 1491 Flight 558 Flight 1036 Flight 217 Flight 6263 Flight 141 Flight 630 Flight X-167 Flight 6551 Flight 109 Flight A-13 Flight 3932 Flight 964 Flight 19 Flight 2022 Flight 2420 CCCP-75559 crash Flight 662 Flight E-15 Flight A-53 Flight 2003 Flight 3739 Flight 909 Flight 1802 Flight 418 Flights 7957 and 31 Flight 2415 Flight N-36 Flight 3843 Flight 5003 Flight 331 Flight B-2 Flight 6709 Flight 1080 Flight 6515 Flight 1691 Flights 7628 and 7880 Flight 5484
1980s	Flight 4225 Flight 498 Flight 811 Flight 3603 Flight 8641 Flight 411 Flight 343 Flight 5463 Flight 601 Flight 3352 Flight F-637 Flight 3519 Flight 7841 Zolochiv mid-air collision Flight 5143 Flight 101/435 Flight F-77 Flight 2306 Flight 6502 Flight 892 Flight U-505 Flight N-528 Flight 699 Flight 3739
since 1990s	Flight E-35D CCCP-46472 crash Flight 2808 Flight 593 Flight 521 Flight 821 Flight 1492

v t e Aviation accidents and incidents in 1970 (1970)
Jan 5 Spantax Convair crashJan 28 Batagay An-24 crashJan 29 Aeroflot Flight 145Feb 2 Cornfield Bomber crash landingFeb 4 Aerolineas Argentinas Flight 707Feb 4 TAROM Flight 35Feb 6 Aeroflot Flight U-45Feb 15 Dominicana DC-9 disasterFeb 21 Swissair Flight 330Mar 14 Paraense Transportes Aéreos Flight 903Mar 17 Eastern Air Lines Shuttle Flight 1320Mar 31 Japan Airlines Flight 351Apr 1 Aeroflot Flight 1661Apr 1 Berrechid crashApr 21 Philippine Airlines Flight 215May 2 ALM Flight 980May 15 Dymshits–Kuznetsov hijacking affairJul 3 Dan-Air Flight 1903Jul 5 Air Canada Flight 621Jul 18 Soviet Air Force Antonov An-22Jul 22 Olympic Airways Flight 255 hijackingJul 27 Flying Tiger Line Flight 45Aug 9 LANSA Flight 502Aug 12 China Airlines Flight 206Sep 2 Aeroflot Flight 3630Sep 6 Dawson's Field hijackingsSep 8 Trans International Airlines Flight 863Sep 26 Flugfélag Íslands Flight 704Oct 2 Wichita State Univ football teamOct 15 Aeroflot Flight 244Nov 14 Southern Airways Flight 932Nov 27 Capitol International Airways Flight C2C3/26
1969 ◄ ► 1971

Aviation accidents and incidents in 1970 (1970)

Jan 5 Spantax Convair crashJan 28 Batagay An-24 crashJan 29 Aeroflot Flight 145Feb 2 Cornfield Bomber crash landingFeb 4 Aerolineas Argentinas Flight 707Feb 4 TAROM Flight 35Feb 6 Aeroflot Flight U-45Feb 15 Dominicana DC-9 disasterFeb 21 Swissair Flight 330Mar 14 Paraense Transportes Aéreos Flight 903Mar 17 Eastern Air Lines Shuttle Flight 1320Mar 31 Japan Airlines Flight 351Apr 1 Aeroflot Flight 1661Apr 1 Berrechid crashApr 21 Philippine Airlines Flight 215May 2 ALM Flight 980May 15 Dymshits–Kuznetsov hijacking affairJul 3 Dan-Air Flight 1903Jul 5 Air Canada Flight 621Jul 18 Soviet Air Force Antonov An-22Jul 22 Olympic Airways Flight 255 hijackingJul 27 Flying Tiger Line Flight 45Aug 9 LANSA Flight 502Aug 12 China Airlines Flight 206Sep 2 Aeroflot Flight 3630Sep 6 Dawson's Field hijackingsSep 8 Trans International Airlines Flight 863Sep 26 Flugfélag Íslands Flight 704Oct 2 Wichita State Univ football teamOct 15 Aeroflot Flight 244Nov 14 Southern Airways Flight 932Nov 27 Capitol International Airways Flight C2C3/26

1969 ◄ ► 1971

v t e Aviation accidents and incidents in the Soviet Union in the 1970s
1970	Batagay Aeroflot An-24 crash (28 January 1970) Aeroflot Flight 145 (29 January 1970) Aeroflot Flight U-45 (February 1970) Aeroflot Flight 1661 (April 1970) Dymshits–Kuznetsov hijacking affair (June 1970) Aeroflot Flight 3630 (September 1970) Aeroflot Flight 244 (October 1970)
1971	Surgut Aeroflot An-12 crash (22 January 1971) Surgut Aeroflot An-12 crash (31 January 1971) Aeroflot Flight 1969 (March 1971) Aeroflot Flight 1912 (July 1971) Malév Flight 110 (September 1971) Aeroflot Flight 773 (October 1971) Aeroflot Flight N-63 (November 1971) Aeroflot Flight 2174 (December 1971)
1972	Aeroflot Flight B-608 (4 May 1972) Svetlogorsk An-24 crash (16 May 1972) Aeroflot Flight 1491 (18 May 1972) Aeroflot Flight 558 (August 1972) Aeroflot Flight 1036 (1 October 1972) Aeroflot Flight 217 (13 October 1972) Japan Air Lines Flight 446 (November 1972)
1973	Aeroflot Flight 6263 (January 1973) Aeroflot Flight 630 (24 February 1973) Aeroflot Flight X-167 (28 February 1973) Balkan Bulgarian Airlines Flight 307 (March 1973) Aeroflot Flight 2420 (April 1973) Aeroflot Flight 6551 (11 May 1973) Aeroflot Flight 109 (18 May 1973) Aeroflot Flight A-13 (August 1973) Aeroflot Flight 3932 (September 1973) Aeroflot Flight 964 (October 1973) Aeroflot Flight 19 (November 1973) Aeroflot Flight 2022 (December 1973)
1974	Aeroflot Flight H-75 (January 1974) Leningrad Aeroflot Il-18 crash (April 1974)
1975	Aeroflot Flight E-15 (July 1975) Aeroflot Flight 6274 (November 1975)
1976	Aeroflot Flight 2003 (January 1976) Aeroflot Flight 3739 (February 1976) Aeroflot Flight 909 (March 1976) Aeroflot Flight 1802 (May 1976) Anapa mid-air collision (September 1976) Aeroflot Flight 2415 (November 1976) Aeroflot Flight N-36 (December 1976)
1977	Aeroflot Flight 3843 (January 1977) Aeroflot Flight 5003 (February 1977) Tavda mid-air collision (May 1977) Aeroflot Tu-134 hijacking (10 July 1977) Aeroflot Flight B-2 (20 July 1977)
1978	Korean Air Lines Flight 902 (April 1978) Aeroflot Flight 6709 (19 May 1978) Yegoryevsk Tu-144 crash (23 May 1978) Iranian Chinook shootdown (June 1978) Aeroflot Flight 1080 (7 October 1978) Aeroflot Flight 6515 (23 October 1978)
1979	Aeroflot Flight 1691 (March 1979) Dniprodzerzhynsk mid-air collision (11 August 1979) Aeroflot Flight 5484 (29 August 1979)
1960–1969 ◄ 1970–1979 ► 1980–1991

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