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Aeroflot Flight 3352 was a Tupolev Tu-154 airline flight on a domestic route from Krasnodar to Novosibirsk, with an intermediate landing in Omsk. While landing at Omsk Airport on Thursday, 11 October 1984, the aircraft crashed into maintenance vehicles on the runway, killing 174 people on board and 4 on the ground. While a chain of mistakes in airport operations contributed to the accident, its major cause was an air traffic controller falling asleep on duty. As of 2015, this remains the deadliest aviation accident on Russian territory.〔〔〔〔〔 〕 ==Accident details== At 5:00 am local time (UTC/GMT + 7 hours), Flight 3352 was preparing to land at Tsentralny Airport in Omsk, a key Russian city in southwestern Siberia, which has a population of over 1 million and is the administrative center of Omsk Oblast. At the time, this was the only aircraft approaching Omsk, and it was cleared for landing when it contacted the airport.〔〔 At 5:20 am, worried that the continuing rain would make the runway overly slippery, the airport ground maintenance crew requested permission to dry the runway. The ground controller on duty gave permission and proceeded to fall asleep soon after, in the process forgetting to switch on the "runway occupied" warning. In any case, under airport regulations, this whole procedure should never have happened; permission to close and do maintenance on a runway could only be given by the chief controller, and he was absent. The maintenance crew, following the airport's routine, moved three vehicles to the runway: a UAZ-469 all-terrain vehicle with an attached trailer, operated by a driver and crew manager in front; followed by KrAZ and Ural trucks. The latter were equipped with dry air compressors and loaded with fuel, and weighed 16–20 tons. The drying detail then proceeded to violate their own safety rules while performing their tasks: all of their vehicles should have their top, flickering lights on continuously. However, the lights were too bright for the maintenance workers' liking, so they kept them lit only until they started and after they finished their work. This intentional oversight was to play a part in the pilots being unable to see the vehicles on the runway (they could not from the air).〔〔 In contrast, the runway crew saw the Tu-154 coming at them from a good distance, its landing lights on. They did attempt to contact ground control three times about the lights, but received no response and so ignored them, thinking they were being tested by a plane not on final approach.〔〔 Around 5:36 am, Flight 3352 requested permission to land from the approach controller. The request was sent twice; the pilots noticed vague contours on the runway and wanted to double check for obstacles. The controller verified the runway status, which remained apparently unoccupied, then contacted the ground controller and received no response, and subsequently contacted the flight controller on internal radio and received an inaudible reply that sounded like "..ree" (original, (ロシア語:..бодна)) and was taken as "free" ((ロシア語:свободна); communications were being taped and were analyzed later). The approach controller cleared the landing, though unable to see the runway, and in spite of regulations that required him to keep the flight in the air and double check the runway's status. Both the ground controller and secondary controller should have been able to see the runway, but the former was asleep,〔 and the latter was absent due to staff shortages. At 5:38 am, the flight passed the lowest height at which the flight crew could abort the landing. The aircraft landed at a normal 240 km/h (149 mph/130 knots). On touchdown, the flight crew saw the array of drying vehicles and attempted to turn the aircraft, but were unable to avoid the collision. The plane crashed into the Ural truck and then 200 m down the runway crashed into the KrAZ, igniting the 7 tons of fuel in each truck and the aircraft's fuel tank. The plane overturned and broke into pieces, some of which crashed into the UAZ-469. A catastrophic fracture of the fuel tanks caused burning fuel to leak into the fuselage, incinerating all but one passenger. The cockpit section detached and flew past the burning vehicles. It suffered no major damage, and all four crew members survived, suffering only minor injuries.〔〔〔(【引用サイトリンク】script-title=ru:Катастрофа Ту-154Б-1 Толмачевского ОАО в а/п Омск )〕〔 They escaped from the cabin and ran to the crash site in an attempt to help the passengers. Four ground maintenance crew were killed instantly inside the vehicles. One survivor in the passenger seat of the UAZ caught on fire, which was extinguished.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aeroflot Flight 3352」の詳細全文を読む スポンサード リンク
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