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Braathens SAFE Flight 253, also known as the Hummelfjell Accident ((ノルウェー語:Hummelfjell-ulykken)), occurred on 7 November 1956 at 9:50, when a de Havilland Heron crashed into the mountain Hummelfjell in Tolga, Norway. The Braathens SAFE aircraft was en route from Trondheim Airport, Værnes to Oslo Airport, Fornebu. While passing Røros the Heron started experiencing a rapidly accelerating atmospheric icing which soon was too extensive for the ice protection system to handle. Combined with downdraft, the aircraft lost sufficient lift to stay airborne. The pilots were able to turn around the aircraft, but it hit Hummelfjell at an altitude of above mean sea level. The aircraft's captain was killed in the impact and a passenger died shortly afterwards. Ten people survived the crash, which was the first fatal accident of Braathens SAFE. Amongst the survivors was Rolf Kirkvaag, at the time Norway's most popular radio host. The search and rescue operation was severely hindered by a blizzard and poor visibility. Kirkvaag and another person left the plane after a day and met a rescue party. The investigation concluded that there were neither technical faults with the aircraft nor pilot error, and that it was not possible to predict the weather conditions which caused the icing. ==Flight== The accident aircraft was a de Havilland DH-114 Heron 2B with registration LN-SUR, serial number 14093 and named ''Lars''. It was bought new by Braathens SAFE and was registered on 8 February 1956.〔Hagby: 294〕 The Herons had been introduced in Braathens SAFE's fleet in 1952 and remained in service until 1960.〔Tjomsland and Wilsberg: 64–65〕 ''Lars'' was insured by Lloyd's. Flight 253 was a scheduled morning service from Trondheim Airport, Værnes to Oslo Airport, Fornebu, with a nominal flight time of one and a half hours. It had a flight crew of two and ten passengers.〔Tjomsland and Wilsberg: 111〕 Among the passengers was Rolf Kirkvaag, a radio host and journalist for the Norwegian Broadcasting Corporation. He was at the time the channel's most popular hosts, specializing in quiz programs. He has been described as Norway's first national celebrity. The flight departed Værnes at 8:30. It climbed to a cruising altitude of 2,500 meters (8,000 ft) and passed Tolga Radio Beacon at 09:12. In the area around Røros the aircraft started experiencing icing, which quickly rose to levels which could not be handled by the ice protection system. In addition, the aircraft was subject to a downdraft. The pilots therefore chose to turn the aircraft around and return to Trondheim. However, the icing was so aggressive that the aircraft continued to lose elevation.〔(【引用サイトリンク】publisher=Aviation Safety Network )〕 It was flying through a blizzard and there was poor sight, making navigation difficult. In addition to influencing the lift, the icing covered the windshield and the radio antenna, causing radio communication to be cut. The pilot was therefore not able to navigate properly and was not aware of that he was flying over the mountain.〔 The aircraft hit the mountain of Hummelfjell at 09:50—at an altitude of 〔—in the municipality of Tolga. The aircraft had a speed of at the time of impact, hitting the ground with the tail first. The engines broke off and the aircraft slid along the snow dune.〔 The aircraft bounced once before settling in a snow dune, which severely limited the impact and presumably saved the lives of many of the passengers.〔 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「Braathens SAFE Flight 253」の詳細全文を読む スポンサード リンク
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