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TWA 800 : ウィキペディア英語版
TWA Flight 800

Trans World Airlines Flight 800 (TWA 800), was a Boeing 747-100 which exploded and crashed into the Atlantic Ocean near East Moriches, New York, on July 17, 1996, at about 8:31 p.m. EDT, 12 minutes after takeoff from John F. Kennedy International Airport on a scheduled international passenger flight to Rome, with a stopover in Paris. All 230 people on board were killed in the third-deadliest aviation accident in U.S. territory.
Accident investigators from the National Transportation Safety Board (NTSB) traveled to the scene, arriving the following morning, and there was much initial speculation that a terrorist attack was the cause of the crash. Consequently, the Federal Bureau of Investigation (FBI) initiated a parallel criminal investigation. Sixteen months later, the FBI announced that no evidence had been found of a criminal act and closed its active investigation.
The four-year NTSB investigation concluded with the approval of the Aircraft Accident Report on August 23, 2000, ending the most extensive, complex, and costly air disaster investigation in U.S. history.〔(【引用サイトリンク】title=NTSB Board Meeting on TWA 800 August 23, 2000, Part 4 )〕 The report's conclusion was that the probable cause of the accident was an explosion of flammable fuel/air vapors in a fuel tank, and, although it could not be determined with certainty, the most likely cause of the explosion was a short circuit. As a result of the investigation, new requirements were developed for aircraft to prevent future fuel tank explosions.
TWA Flight 800 conspiracy theories exist, the most prevalent being that a missile strike from a terrorist or an accidental launch from a U.S. Navy vessel caused the crash, and is the subject of a government coverup. Witness accounts lend support to the most prevalent theory.
==Accident flight==

:''All times in this article are Eastern Daylight Time (EDT).''
The accident airplane, registration N93119, (Boeing 747-131) was manufactured by Boeing in July 1971; it had been ordered by Eastern Air Lines, but after Eastern canceled its 747 orders, the plane was purchased new by TWA. The aircraft had completed 16,869 flights with 93,303 hours of operation. On the day of the accident, the airplane departed Athens, Greece as TWA Flight 881 and arrived at John F. Kennedy International Airport (JFK) about 4:38pm. The aircraft was refueled, and there was a crew change; the new flight crew consisted of 58-year-old Captain Ralph G. Kevorkian, 57-year-old Captain/Check Airman Steven E. Snyder, and 63-year-old Flight Engineer/Check Airman Richard G. Campbell (all with more than 30 years of employment at TWA), as well as 24-year-old flight engineer trainee Oliver Krick, who was starting the sixth leg of his initial operating experience training.
The ground-maintenance crew locked out the thrust reverser for engine #3 (treated as a minimum equipment list item) because of technical problems with the thrust reverser sensors during the landing of TWA 881 at JFK, prior to Flight 800's departure. In addition, severed cables for the engine #3 thrust reverser were replaced. During refueling of the aircraft, the volumetric shutoff (VSO) control was believed to have been triggered before the tanks were full. To continue the pressure fueling, a TWA mechanic overrode the automatic VSO by pulling the volumetric fuse and an overflow circuit breaker. Maintenance records indicate that the airplane had numerous VSO-related maintenance writeups in the weeks before the accident.
TWA 800 was scheduled to depart JFK for Paris around 7:00pm, but the flight was delayed until 8:02pm by a disabled piece of ground equipment and a passenger/baggage mismatch.〔 After the owner of the baggage in question was confirmed to be on board, the flight crew prepared for departure and the aircraft pushed back from Gate 27 at the TWA Flight Center.
TWA 800 then received a series of heading changes and generally increasing altitude assignments as it climbed to its intended cruising altitude. Weather in the area was light winds with scattered clouds, and there were dusk lighting conditions. The last radio transmission from the airplane occurred at 8:30pm when the flight crew received and then acknowledged instructions from New York Center to climb to . The last recorded radar transponder return from the airplane was recorded by the Federal Aviation Administration (FAA) radar site at Trevose, Pennsylvania at 8:31:12pm.
Thirty-eight seconds later, the captain of an Eastwind Airlines Boeing 737 reported to Boston ARTCC that he "just saw an explosion out here", adding, "we just saw an explosion up ahead of us here...about or something like that, it just went down into the water." Subsequently, many air traffic control facilities in the New York/Long Island area received reports of an explosion from other pilots operating in the area. Many witnesses in the vicinity of the crash stated that they saw or heard explosions, accompanied by a large fireball or fireballs over the ocean, and observed debris, some of which was burning while falling into the water.〔
Individuals in various civilian, military, and police vessels reached the crash site and searched for survivors within minutes of the initial water impact, but no survivors were found, making TWA 800 the second-deadliest aircraft accident in United States history at that time.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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