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On December 28, 1997, United Airlines Flight 826 was operated by a Boeing 747-100 flying from New Tokyo Airport (Changed name to a Narita Airport in 2004), Japan to Honolulu International Airport, Hawaii. Two hours into the flight, at an altitude of , the plane received reports of severe clear-air turbulence in the area and the seat belt sign was turned on. Moments later, the aircraft suddenly dropped around , seriously injuring 15 passengers and 3 crew members,〔(【引用サイトリンク】url=http://www.ntsb.gov/news/press-releases/Pages/Aircraft_Accident_Investigation_United_Airlines_flight_826_Pacific_Ocean.aspx )〕 The plane turned around and landed safely back in Tokyo, but one passenger, a 32-year-old Japanese woman, was killed.〔(【引用サイトリンク】url=http://news.bbc.co.uk/2/hi/43065.stm )〕〔〔"(NTSB examines data recorder from turbulent United flight )." CNN. December 30, 1997. Retrieved on December 23, 2014.〕 ==Flight details== Flight 826 departed Tokyo's Narita airport on December 28, 1997 at 20:30 local time. It reached a cruising altitude of 31,000 feet just under a half-hour later. The flight was originally planned to cruise at 35,000 feet, but air traffic control (ATC) only cleared to cruise at the lower altitude due to air traffic. The captain chose the only authorized route at the time in which severe turbulence or thunderstorms were not forecast to occur. At cruising altitude, the flight initially encountered enough turbulence for the captain to turn on the fasten seatbelt sign. Fifteen minutes later, the turbulence subsided and the fasten seatbelt sign was switched off. At the time the captain announced to the passengers that turbulence was still a possibility and that the seat belts should be fastened when seated. A flight attendant made a Japanese announcement that was similar.〔〔 About an hour later after calm conditions, the fasten seat belt sign came on again without any announcement. After about two minutes of not very strong turbulence, suddenly the 747 dropped slightly then shot back up and then back down at such a velocity that a purser, who was hanging on to a fixed countertop, found himself hanging upside down holding the countertop with his feet in the air. The airplane then pitched up and steeply climbed before heavily falling again, this occurring when the right wing dropped sharply. After another moderate climb, the flight returned to normal.〔 After the incident, a Japanese woman who had her belt unfastened was found lying unconscious and bleeding heavily in the aisle. Despite quick resuscitation efforts by injured flight attendants and a passenger doctor, she was soon pronounced dead.〔〔 Fifteen passengers and three flight attendants had spine and neck fractures. Another 161 other passengers had bruises, sprains and other minor injuries. While Henderson Field on Midway Atoll was the closest airport, the captain opted to return to Tokyo after assessing the aircraft was still flightworthy and Tokyo had medical facilities judged better to handle the injuries.〔 Three hours later, the aircraft landed safely at Narita airport. 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「United Airlines Flight 826」の詳細全文を読む スポンサード リンク
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