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Widerøe Flight 839, also known as the Værøy Accident ((ノルウェー語:Værøy-ulykken)), was a crash into water of a de Havilland Canada DHC-6-300 Twin Otter just after take-off from Værøy Airport in Norway. The incident occurred on 12 April 1990 at 14:44, and killed all five people on board. The cause of the accident were strong winds that exceeded the structure's tolerance, causing the tail rudder and tailplane to crack so the plane became uncontrollable. Impact occurred 63 seconds after take-off and 8 seconds after the crack. The aircraft crashed into the water, and a search was conducted for several days to find the wreck. Uneven and strong winds had given the airport low regularity, and prior to take-off, wind speeds of had been recorded.The accident caused the airport to be permanently closed, and replaced by Værøy Heliport. The incident was investigated by the Accident Investigation Board Norway, who published their conclusions in 1991. Three years later, a new investigation was conducted, after an engineer had stated that the cause of the accident could instead have been fatigue. The second investigation came to the same conclusion as the first and all involved parties have since supported the causes made in the initial report. ==Accident== Widerøe Flight 839 was a scheduled flight from Værøy Airport to Bodø Airport operated with a de Havilland Canada DHC-6-300 Twin Otter. The aircraft had registration LN-BNS and serial number 536, and was delivered to Widerøe on 27 April 1977.〔Arnesen, 1984: 132〕 It was insured with Norsk Flyforsikringspool.〔Accident Investigation Board Norway, 1991: 10–11〕 The aircraft left Bodø Airport at 13:36 as Flight 838 to Røst Airport, where it landed at 14:04. It continued to Værøy as Flight 839, leaving Røst at 14:14. During this flight the crew received information that the wind at the east end of the runway was from 270°, varying from —a moderate gale. When the plane landed at 14:30, the tower had stated that the wind was from 270° and max . The crew commented on the wind after landing, and stated that the wind blew from all directions. At Værøy Airport, three passengers disembarked, two passengers boarded and the plane fueled. There was also a passenger in transit from Røst to Bodø, so the total ridership was three passengers, plus the two pilots.〔Accident Investigation Board Norway, 1991: 5–6〕 Take-off weight was , including of fuel.〔Accident Investigation Board Norway, 1991: 11〕 The aircraft taxied to runway 25. During the departure briefing, the captain decided not to follow the company's standard procedure and have a climb at 320° instead of 280°. Maximum measured wind had been recorded at while the aircraft had been parked. The aircraft asked for clearance at 14:42:10; this was granted, and the air control informed that the wind at the west end was between 210° and 290°, varying from . The eastern wind was not communicated to the aircraft, but was 270°, varying from . The take-off started at 14:42:43 and the aircraft was airborne after having passed half the runway. Witnesses described that the aircraft after take-off climbed quickly, but then started falling, and then climbed quickly again. It then entered clouds west of the airport. During climb, the captain wanted to keep the flaps at 10°, contradictory to standard procedure that involved decreasing the flaps. At 14:43:09, a rattling sound was registered on the cockpit voice recorder (CVR). Thirty-five seconds later, sounds from unsynchronized propellers were registered. The co-pilot indicates that the flight was in difficulty. Eight seconds later, at 14:43:52, the CVR stopped recording. At 14:43:54, the control tower at Værøy registered a distress signal, that lasted four seconds, followed by a loud bang. The aircraft was then repeatedly called by radio. At 14:50, Bodø Air Traffic Control Center was contacted.〔Accident Investigation Board Norway, 1991: 7–8〕 The Joint Rescue Coordination Centre of Northern Norway in Bodø dispatched two helicopters and two ships, but one helicopter and one ship had to return due to the bad weather that soon had increased to a hurricane. At 16:45, parts of the aircraft were found northwest of Værøy Airport.〔 After the weather improved, one rescue ship, four fishing vessels and one Westland Sea King were used to find the wreck. On 13 April, twelve ships and two helicopters were being used, and several parts from the wreck were found. This allowed the searching crew to use divers search for the wreck. The aircraft was found on 15 April, from the airport. Eighty percent of the wreck was found within an area of and at about depth.〔Accident Investigation Board Norway, 1991: 16〕 The deceased were Captain Idar Nils Persen (40), Co-pilot Arnt Vidar Grønneflåta (31), and passengers Stig Myrvoll (25), Frank Bakkeli (27) and Runa Dagny Søraa (23).〔〔 All passengers died immediately upon impact,〔Accident Investigation Board Norway, 1991: 20〕 but the Captain's body was never found.〔 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「Widerøe Flight 839」の詳細全文を読む スポンサード リンク
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