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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Los Angeles Airways Flight 417 ： ウィキペディア英語版 Los Angeles Airways Flight 417 Los Angeles Airways Flight 417 was a Sikorsky S-61 helicopter that crashed on August 14, 1968 in the city of Compton, California. All eighteen passengers and three crewmembers were fatally injured. The aircraft was destroyed by impact and fire. According to the National Transportation Safety Board the probable cause of the accident was fatigue failure. The accident happened when the (arbitrarily designated) yellow blade, one of five main rotor blades, separated at the spindle which attached the blade to the rotor head. Following failure, the helicopter was uncontrollable and it fell to the ground. The fatigue crack originated in an area of substandard hardness and inadequate shot peening.〔(NTSB Report )〕 ==History== Los Angeles Airways (LAA) Flight 417 was a regularly scheduled passenger flight from Los Angeles International Airport to the Disneyland Heliport in Anaheim, California. The aircraft and crew had completed three round trips to various destinations in the Greater Los Angeles Metropolitan Area beginning at 0607 PDT and departed the ramp at Los Angeles for Flight 417 at 1026. The flight, operating under Visual Flight Rules was cleared by Los Angeles Helicopter Control to take off and proceed eastbound at 10:28:15. At 10:29:30 the flight reported to Hawthorne Tower that it was departing Los Angeles eastbound along Imperial Highway at . At 10:32:55 Helicopter Control advised, "L.A. four seventeen, seven miles east, radar service terminated." The flight acknowledged, "Four seventeen thank you." This was the last known radio contact with the flight.〔 Statements were obtained from 91 witnesses. A consensus of their observations indicates that the helicopter was proceeding along a normal flightpath when a loud noise or unusual sound was heard. A main rotor blade was either observed to separate or was seen separated in the vicinity of the main rotor disc. As the helicopter fell in variously described gyrations, the tail cone either folded or separated. In order to establish an approximate altitude for the flight, several comparative flights were conducted in a similar helicopter. Most witnesses indicated the flights at to appeared to be most accurate.〔 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「Los Angeles Airways Flight 417」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.