Draft:Aeroflot Flight Sh-4
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 An Aeroflot Yak-40, similar to the accident aircraft. | |
| Accident | |
|---|---|
| Date | 3 September 1970 |
| Summary | Controlled flight into terrain |
| Site | Mount Airy-Tash, Asht District, Sughd Region, TaSSR |
| Aircraft | |
| Aircraft type | Yakovlev Yak-40 |
| Operator | Aeroflot |
| Registration | CCCP-87690 |
| Flight origin | Frunze Airport |
| Stopover | Leninabad Airport |
| Destination | Dushanbe Airport |
| Occupants | 21 |
| Passengers | 18 |
| Crew | 3 |
| Fatalities | 21 |
| Survivors | 0 |
Aeroflot Flight Sh-4 was a scheduled passenger flight from Frunze to Dushanbe, with a stopover at Leninabad. On September 3, 1970, the Yakovlev Yak-40 was involved in an aviation accident, when it collided into Mount Airy-Tash. The crash resulted in the deaths of the 21 occupants and was the first accident involving the Yak-40.[1]
Aircraft
The Yak-40, registration CCCP-87690 (MSN 9910503 - Serial number 03-05), was manufactured at the Saratov Aviation Plant in March 1, 1969 and was transferred to the Ministry of Civil Aviation, which on March 12, sent the aircraft to the Dushanbe Aerial Detachment of the Tajik Civil Aviation Directorate. The aircraft had the maximum capacity of 24 passengers. At the time of the accident, the aircraft had accumulated 1020 flight hours and 1344 cycles.[2]
Accident
Flight Sh-4, being operated by the Yak-40, was operating the first leg of the flight of crew from the 186th detachment, consisting of commander (PIC) V. F. Sutormin, First officer G. V. Karpov and Flight engineer V. T. Shashkina. The aircraft had 18 passengers onboard the flight. The aircraft departed Frunze Airport at 20:24 and gaining altitude of 6,600 meters (21,650 ft), following the flight path under regular weather conditions.[1]
After the aircraft flew over the Toktogul Dam, the controller instructed the flight to descent to 5,700 meters (18,700 ft). After descending to the instructed attitude, the aircraft began to deviate 30-50 kilometers north. The crew contacted the dispatcher of Kokand about the route of Namangan and Kokand. At the same time, the controller failed to inspect where the flight was on the radar and did not know where its position was, but gave permission to descend to 3,300 meters (10,800 ft). The crew of the Yak-40 followed the instructions, descending into the height of the mountains, which was higher than the aircraft’s attitude. The dispatcher in Kokand had instructed the captain to contact with Leninabad Airport, without warning the dispatcher in Leninabad and the aircraft’s crew there was no radar contact within the area.[1]
At 21:21, the captain contacted the controller of Leninabad Airport and reported the flight path of flying over Kanibadam on the altitude of 3,300 meters (10,800 ft). The controller, who didn't know where the aircraft was, allowed for a descent to 2,100 meters (6,900 ft). The dispatcher had saw the aircraft turn to the left and there was no marks on the radar, that was until the aircraft was close to the mountains, he failed to give instructions to began climbing and return to the regulated flight path. The pilots did not use the yoke that was available and did not return to the specified flight path.[1]
At 21:26, the flight, flying at an altitude of 2,100 meters (6,900 ft) and being at a speed of 500 km/h (270 kts) and 90km away from Leninabad, collided into Mount Airy-Tash at an altitude of 2,300 meters (7,500 ft) and was destroyed on impact, killing the 21 occupants onboard.[1]
Causes
The commission had determined the following for the cause of the accident:[1]
- Violation of the crew of within NPP GA-66 and NSHS GA-62 by the use of ground and aircraft navigation for the specific flight path, which led to the collision with the mountains.
- Reduction of the altitude of the aircraft by using the IFR when flying in the mountainous terrain by the dispatchers of Kokand and Leninabad, despite the lack of radar to show the aircraft’s actual location, and the non-use of technical meanings to control the flight maneuvers.
The commission had also found the following contributing factors, leading to the accident:[1]
“Terrible navigation training for the PIC and F/O, lack of experience with the IFR during flights with the Yak-40. Both pilots had recently been retaught to fly the Yak-40, by flying the Il-14 and An-2. It was noted during training that on flights using the IFR, the curtains of the aircraft weren’t used due to the absence of the aircraft that were used for training.”
See also
References
- ^ a b c d e f g "Катастрофа Як-40 Таджикского УГА в 90 км от Ленинабада (борт СССР-87690), 03 сентября 1970 года. // AirDisaster.ru - авиационные происшествия, инциденты и авиакатастрофы в СССР и России - факты, история, статистика". web.archive.org. 2013-01-22. Retrieved 2024-12-19.
- ^ "Wayback Machine". www.webcitation.org. Archived from the original on 2023-10-22. Retrieved 2024-12-19.
External links