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Widerøe Flight 744, also known as the Namsos Accident ((ノルウェー語:Namsos-ulykken)), was a controlled flight into terrain of a de Havilland Canada DHC-6-300 Twin Otter during approach to Namsos Airport, Høknesøra in Norway. The incident occurred on 27 October 1993 at 19:16:48 and killed six of the nineteen people on board, including the crew of two. The scheduled flight was on route between Trondheim Airport, Værnes via Namsos to Rørvik Airport, Ryum and the aircraft crashed at Berg in Overhalla because it held too low an altitude. Parallel investigations were carried out by Namdal Police District and the Accident Investigation Board for Civil Aviation (HSL). A conflict arose between the two as the latter in cooperation with the Norwegian Airline Pilots Association did not want a police investigation until after their report was finished. This caused the police to use two years to gain court permission to access the evidence. The report found no technical problems with the aircraft. However, it found several pilot errors and laid a large responsibility on the airline for lack of proper organization and routines. No-one was charged after the accident, but lead to a major restructure of operations and procedures in Widerøe. ==Accident== Widerøe Flight 744 was a scheduled flight from Trondheim Airport, Værnes to Namsos Airport, Høknesøra operated with a de Havilland Canada DHC-6-300 Twin Otter.〔Accident Investigation Board Norway (1996): 4〕 The aircraft had registration LN-BNM and serial number 408, and was delivered to Widerøe in 1974. The aircraft had flown 40,453 hours and had met all service requirements.〔Accident Investigation Board Norway (1996): 13〕 The pilot in command, Jan Bjørstad, was 43 years old, had held a pilot's license since 1974 and had been employed in Widerøe since 1985. He had held a C certificate since 4 January 1993, and had been a pilot in command since 20 January. He had flown 4,835 hours in total and had landed 13 times at Namsos Airport in the 12 months prior to the accident.〔Accident Investigation Board Norway (1996): 11–12〕 The first officer, Trond Hamre, was 34 years old, had training from the United States which had been converted to a C certificate in 1988. He had 6,354 hours of flight, of which 1,356 was in a Twin Otter. He had been a pilot in command for 3,441 hours prior to working for Widerøe, where he had been employed since 1990. He had landed 27 times at Namsos Airport in the 12 months preceding the accident.〔Accident Investigation Board Norway (1996): 12〕 The first officer was using a medication against back pains which was not permitted while flying. However, these had been prescribed by a physician who had training in aviation medicine. No traces of the substance were found in the pilot's body after the accident.〔Accident Investigation Board Norway (1996): 23〕 The crew had started duty at Bodø Airport at 13:30 (Central European Time, UTC+1) and were to make a round trip to Trondheim Airport, with intermediate stops at Sandnessjøen Airport, Mosjøen Airport, Brønnøysund Airport and Rørvik Airport as Flight 711. On the way down, the flight canceled its stop at Mosjøen because of bad weather. The aircraft landed at Trondheim Airport at 17:52. The return flight was to operate as Flight 744 from Trondheim via Namsos to Rørvik, where the plane and crew were to overnight.〔 At Trondheim, 17 passengers boarded along with of cargo. Estimated flight time to Namsos was 35 minutes.〔 The aircraft had a maximum take-off weight of , while the aircraft took off with . Prior to departure, the ground handling agent SAS Ground Handling had calculated the passenger load and mean aerodynamic chord of the passengers. When correcting after observing the seating of the passengers, the pilot in command had made a calculation mistake in which he thought the passengers did not need to move around. In reality they would have to be rearranged to meet the limits of the distribution of weight.〔Accident Investigation Board Norway (1996): 14〕 The aircraft left Trondheim Airport at 18:37 after which it ascended to cruising height at 1,500 meters (5,000 ft). At 18:53, the QNH was confirmed by Namsos to be 1017 hPa. This gave a height reading of 1,510 meters (4,950 ft) and 1,500 meters (4,900 ft), respectively, for the pilot in command and first officer. There was wind from 250°, with gusts up to .〔Accident Investigation Board Norway (1996): 5–7〕 The pilot in command then decided on the descent plan, involving an initial descent to 1,200 meters (4,000 ft), then down to 900 meters (3,000 ft), before making a swing towards localizer 255. Then the aircraft should descend to 640 meters (2,100 ft) and head towards Namsos Beacon inbound. After that, minimum height was set to 640 meters (2,100 ft). At 19:01, the aerodrome flight information service (AFIS) announced new weather data: the wind had changed to 260° at , with gusts up to . As the crew planned to use runway 26, this would give wind directly against the craft, so the crew decided to add some height to the descent. At 19:05, the first officer stated that the descent checklist was completed, and the pilot in command started the approach checklist. At this time, both height indicators showed . At 19:07, the aircraft was turned to 050°.〔Accident Investigation Board Norway (1996): 5–8〕 At 19:10, the aircraft reached the center line and the aircraft was confirmed by Namsos AFIS at 255°. By 19:14, the aircraft had descended to 640 meters (2,100 ft) and at 19:15:13, it passed Namsos Beacon. At 19:15:30, the first officer confirmed visual contact with the field. At 19:16:35, the pilot in command stated a height of 150 meters (500 ft), confirmed by the first officer. Four seconds later, the pilot in command stated: "we should not descend any further".〔 The aircraft first hit some trees, located above mean sea level.〔Accident Investigation Board Norway (1996): 22〕 At 19:16:48, the aircraft hit a hill from the airport, at Berg in Overhalla. A distress radiobeacon signal was received by Namsos and a search and rescue operation was started immediately. Both pilots and four passengers were killed, while the remaining thirteen passengers were injured.〔Accident Investigation Board Norway (1996): 9–10〕 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 744」の詳細全文を読む スポンサード リンク
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