投稿者：KayEigh

再生回数：161203

再生時間：09:56

Japan Airlines Flight 123 was a Japan Airlines domestic flight from Tokyo International Airport (Haneda) to Osaka International Airport (Itami). The Boeing 747-SR46 that made this route, registered JA8119, suffered mechanical failures 12 minutes into flight and 32 minutes later crashed into two ridges of Mount Takamagahara in Ueno, Gunma Prefecture, 100 kilometers from Tokyo, on Monday 12 August 1985. The crash site was on Osutaka Ridge (おすたかのおね, Osutaka-no-One), near Mount Osutaka. All 15 crew members and 505 out of 509 passengers died, resulting in a total of 520 deaths and 4 survivors. It remains the deadliest single-aircraft accident in history. The official cause of the crash according to the report published by Japan's then Aircraft Accidents Investigation Commission is as follows: 1. The aircraft was involved in a tailstrike incident at Osaka International Airport on 2 June 1978, which damaged the aircraft's rear pressure bulkhead. 2. The subsequent repair of the bulkhead did not conform to Boeing's approved repair methods. Their procedure calls for one continuous doubler plate with three rows of rivets to reinforce the damaged bulkhead, but the Boeing technicians fixing the aircraft used two separate doubler plates, one with two rows of rivets and one with only one row. This reduced the part's resistance to metal fatigue by 70%. According to the FAA, the one "doubler plate" which was specified for the job (the FAA calls it a "splice plate" - essentially a <b>...</b>