Aeroflot Flight 411

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Aeroflot Flight 411
Ilyushin Il-62M, Aeroflot AN1061812.jpg
An Aeroflot Ilyushin Il-62M, similar to the accident aircraft
Accident summary
Date 6 July 1982
Summary Low-altitude stall
Site Mendeleyevo, Moscow Oblast, Soviet Union
Passengers 82
Crew 8
Injuries (non-fatal) 0
Fatalities 90 (all)
Survivors 0
Aircraft type Ilyushin Il-62M
Operator Aeroflot
Registration СССР-86513[a]
Flight origin Moscow, Soviet Union
Stopover Dakar, Senegal
Destination Freetown, Sierra Leone

Aeroflot Flight 411 was an international scheduled flight from Sheremetyevo Airport, Moscow to Freetown, Sierra Leone via Dakar in Senegal.[1] Early on 6 July 1982, the four-engined Ilyushin Il-62 that was operating the service crashed and was destroyed by fire after two engines were shut down shortly after take-off.[1][2] All of the 90 passengers and crew on board died as a result of the crash.

Aircraft[edit]

The accident aircraft was an Ilyushin Il-62M, with registration SSSR-86513.[a] Its first flight was in November 1980 and it had flown slightly more than 4,800 hours prior to the accident.[1] The Il-62's four jet engines are mounted in pairs, on pylons either side of the rear fuselage.

Accident[edit]

The aircraft took off from Moscow's Sheremetyevo Airport at 12:33am with 82 passengers and 8 crew on board.[3] Within seconds the engine fire warning for No. 1 engine[b] was annunciated. The crew shut down the engine and discharged the engine fire extinguishers. Less than a minute later the engine fire warning for No. 2 engine[b] was also annunciated and the crew shut this engine down as well.[3] The crew turned the aircraft to return to Sheremetyevo Airport but after the second engine shutdown it was only at an altitude of about 160 metres (520 ft) and a speed of 320 kilometres per hour (170 kn).[1] Despite the pilots' efforts to keep it airborne, the aircraft gradually lost height and airspeed until it stalled about 75 metres (246 ft) above the ground.[1] It then crashed in a forested wetland 1.5 kilometres (0.9 mi) east of the town of Mendeleyevo and 11.4 kilometres (7.1 mi) northwest of Sheremetyevo Airport, less than three minutes after takeoff.[1] All but one occupant died in the crash and subsequent fire; the sole survivor, a passenger from Sierra Leone, died on the evening of 8 July.[1]

Investigation[edit]

Post-crash examination of the engines found no pre-crash damage or signs of in-flight fire – the fire warnings were false.[1][2] The fire warning system was almost completely destroyed by the crash and fire and the reason for the false warnings could not be determined; although there had been nine reported instances of bleed air leaks causing spurious engine fire warnings on Il-62s between 1975 and the date of the crash, this was ruled out as a cause.[1]

The investigation found that it was impossible for the aircraft to maintain altitude on two engines with its flaps set for takeoff and at its weight of 164,514 kilograms (362,691 lb), which was close to the maximum takeoff weight for an Il-62.[1] It found no fault with the pilots' actions, who could not make a forced landing because of the dark and the urban areas on the ground below.[1] The investigation found the pilots had followed flight manual procedures; however there was no procedure in the flight manual to cover the situation in which they found themselves.[1]

Notes[edit]

  1. ^ a b The aircraft registration prefix for civil aircraft registered in the Soviet Union was SSSR. In the Russian cyrillic alphabet, the english letter "S" is written as "C" and "R" is written as "P", hence "CCCP" is "SSSR" in cyrillic.
  2. ^ a b Engine No. 1 and Engine No. 2 are paired on the left side of the aircraft.

References[edit]

  1. ^ a b c d e f g h i j k l airdisaster.ru Катастрофа Ил-62М ЦУМВС в окрестностях пос. Менделеево (Russian)
  2. ^ a b UK CAA Document CAA 429 World Airline Accident Summary
  3. ^ a b Accident description for CCCP-86513 at the Aviation Safety Network. Retrieved on 3 January 2015.

Coordinates: 56°01′39″N 37°15′30″E / 56.02750°N 37.25833°E / 56.02750; 37.25833