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JAL Safety Promotion Center

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JAL Safety Promotion Center
Phone:
+81 3-5756-3566

Address:
3-5-1 Hanedakuko | JAL Maintenance Center 1, Ota 144-0041, Tokyo Prefecture

Japan Airlines Flight 123 was a scheduled domestic Japan Airlines passenger flight from Tokyo's Haneda Airport to Osaka International Airport, Japan. On Monday, August 12, 1985, a Boeing 747SR operating this route suffered a sudden decompression twelve minutes into the flight and crashed in the area of Mount Takamagahara, Ueno, Gunma Prefecture, 100 kilometres from Tokyo thirty-two minutes later. The crash site was on Osutaka Ridge, near Mount Osutaka. Japan's Aircraft Accident Investigation Commission officially concluded that the rapid decompression was caused by a faulty repair by Boeing technicians after a tailstrike incident during a landing at Osaka Airport seven years earlier. A doubler plate on the rear bulkhead of the plane had been improperly repaired, compromising the plane's airworthiness. Cabin pressurization continued to expand and contract the improperly repaired bulkhead until the day of the accident, when the faulty repair finally failed, causing the rapid decompression that ripped off a large portion of the tail and caused the loss of hydraulic controls to the entire plane. The aircraft, configured with increased economy class seating, was carrying 524 people. Casualties of the crash included all 15 crew members and 505 of the 509 passengers; some passengers survived the initial crash but subsequently died of their injuries hours later, mostly due to the Japan Self-Defense Forces’s decision to wait until the next day to go to the crash site, after denying an offer from a nearby United States Air Force base to start an immediate rescue operation. It remains the deadliest single-aircraft accident in aviation history, the second-deadliest Boeing 747 accident and the second-deadliest aviation accident after the collision of two Boeing 747s in the 1977 Tenerife airport disaster.
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