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Aeroflot Flight 8641 was a Yakovlev Yak-42 airliner on a domestic scheduled passenger flight from Leningrad to Kyiv. On 28 June 1982, the flight crashed south of Mozyr, Belorussian SSR, killing all 132 people on board. The accident was both the first and deadliest crash of a Yakovlev Yak-42, and remains the deadliest aviation accident in Belarus.[1][2]

Aeroflot Flight 8641
An Aeroflot Yak-42 in 1981, similar to the accident aircraft
Accident
Date28 June 1982 (1982-06-28); 40 years ago
SummaryJackscrew failure due to metal fatigue; design flaw
SiteNear Mazyr, Byelorussian SSR, Soviet Union
52°0′N 29°13′E
Aircraft
Aircraft typeYakovlev Yak-42
OperatorAeroflot
RegistrationCCCP-42529
Flight originPulkovo Airport, Leningrad, Russian SFSR, Soviet Union
DestinationKyiv-Zhuliany International Airport, Kiev, Ukrainian SSR, Soviet Union
Occupants132
Passengers124
Crew8
Fatalities132
Survivors0

The cause was a failure of the jackscrew controlling the horizontal stabilizer due to a design flaw.


Aircraft and crew


The Yakovlev Yak-42 involved in the accident was registered to Aeroflot as CCCP-42529 (manufacturer number 11040104, series number 04-01). The aircraft made its maiden flight on 21 April 1981 and was delivered to Ministry of Civil Aviation on 1 June 1981. At the time of the accident it had 795 flight hours and 496 takeoff and landing cycles.[3]

All 124 passenger seats were filled, 11 of them were filled by children. The cockpit crew consisted of:[3][4]


Sequence of events


The aircraft took off from Pulkovo Airport at 9:01 Moscow time, having been delayed one minute because of a late passenger. At 10:45 it entered the zone of Kiev/Boryspil air traffic control Center. The crew started the landing checklist at 10:48:01. At 10:48:58 the crew informed the air traffic controller they reached the planned top of descent point, the controller clearing them for descent to FL255 (approximately 25,500 feet (7,800 m)). The crew confirmed the flight path; no further communications were heard from Flight 8641.

At 10:51:20 the autopilot gradually brought about a horizontal stabilizer angle of up 0.3° for descent for landing. At 10:51:30 the stabilizer angle sharply increased, exceeding the 2° limit within half a second. The sudden change resulted in a negative g-force of -1.5 g, but the autopilot adjusted the controls to lower it to -0.6 g. As the stabilizer did not respond to commands and the plane went on diving, the autopilot switched off after 3 seconds. The pilots pulled back on the yoke trying to level out the plane, but it continued into a steep dive; soon it rolled 35° left and the dive achieved 50°. As it rolled counterclockwise with over -2 g of overload, the aircraft disintegrated at 10:51:50 at the altitude of 5,700 metres (18,700 ft) and the instrument speed of 810 kilometres per hour (440 kn; 500 mph).[5]

The wreckage was found on the outskirts of Verbavychi village, 10 kilometres (6.2 mi) southeast of the district center Naroulia (itself being further 18 km south/west of the larger Mozyr which is often listed.) Fragments of the plane were scattered across an area of 6.5 by 3.5 kilometres (4.0 by 2.2 mi). All 132 people onboard perished.[5]


Cause


The cause was determined to be a failure of the jackscrew mechanism in the aircraft's tail due to metal fatigue, which resulted from flaws in the Yak-42's design. The investigation concluded that among the causes of the crash were poor maintenance, as well as the control system of the stabilizer not meeting basic aviation standards. Three engineers who signed the jackscrew drawings were convicted.

As for the official cause of the crash: "the spontaneous movement of the stabilizer was due to disconnection in flight of the jackscrew assembly due to the almost complete deterioration of the 42M5180-42 thread-nuts due to structural imperfections in the mechanism." Due to the accident, all Yak-42s were withdrawn from service until the design defect was rectified in October 1984.[1][5][6]


See also



References


  1. "ASN Aircraft accident Yakovlev 42 CCCP-42529 Mozyr". aviation-safety.net. Retrieved 2017-12-29.
  2. "УПАВШИЕ С НЕБА. Архив БГ. №29 (345) 29 июля 2002 г. БелГазета. Новости Беларуси. Белорусские новости". www.belgazeta.by. Retrieved 2017-01-11.
  3. "Яковлев Як-42 Бортовой №: СССР-42529". russianplanes.net. Retrieved 2017-12-29.
  4. Документальный детектив (2014-09-15), Документальный детекти полёт..., retrieved 2017-01-11
  5. "Катастрофа Як-42 Ленинградского УГА близ Наровли, Белоруссия". www.airdisaster.ru. Retrieved 2017-01-11.
  6. Gordon, Komissarov and Komissarov 2005, p. 315.


На других языках


[de] Aeroflot-Flug 8641

Am 28. Juni 1982 verunglückte eine Jakowlew Jak-42 auf dem Aeroflot-Flug 8641, einem Linienflug von Leningrad nach Kiew, durch einen mechanischen Defekt in der Trimmung des Höhenleitwerks. Alle 132 Insassen kamen bei dem Absturz ums Leben.
- [en] Aeroflot Flight 8641

[fr] Vol Aeroflot 8641

Le vol Aeroflot 8641 était un vol régulier de passagers domestique assuré par un avion de ligne Yakovlev Yak-42 de Leningrad, en Russie soviétique, à Kiev, en Ukraine soviétique. Le 28 juin 1982, le vol s’écrasa près de Mazyr, en Biélorussie soviétique, tuant les 132 personnes à bord. L'accident était le premier et le plus mortel impliquant un Yak-42, ainsi que le plus meurtrier accident de l'aviation en Biélorussie[1].

[it] Volo Aeroflot 8641

Il volo Aeroflot 8641 era un volo di linea della Aeroflot che il 28 giugno 1982, in viaggio dall'aeroporto di Leningrado-Pulkovo all'aeroporto di Kiev-Žuljany, precipitò vicino al villaggio di Mozyr, nella RSS Bielorussa. Tutte le 132 persone a bordo persero la vita all'impatto.[1] Si tratta del più grave incidente accorso ad uno Yak-42 ed il più grave incidente aereo nella Bielorussia.[2][3]

[ru] Катастрофа Як-42 под Наровлей

Катастрофа Як-42 под Наровлей — крупная авиационная катастрофа, произошедшая в понедельник 28 июня 1982 года. Авиалайнер Як-42 авиакомпании «Аэрофлот» выполнял плановый рейс SU-8641 по маршруту Ленинград—Киев, но через 1 час и 50 минут после взлёта рухнул на землю недалеко от деревни Вербовичи Наровлянского района Гомельской области (Белорусская ССР). Погибли все находившиеся на его борту 132 человека — 124 пассажира и 8 членов экипажа[1].



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