AG1:Vertical tail wing detachment
AG2：Make the engine thrust stronger
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Japan Air Lines Flight 123 was a scheduled domestic passenger flight from Tokyo to Osaka, Japan. On the evening of Monday, August 12, 1985, the Boeing 747 flying the route suffered a severe structural failure and explosive decompression 12 minutes after takeoff. After flying under minimal control for 32 minutes, the plane crashed in the area of Mount Takamagahara, 100 kilometres (62 mi; 54 nmi) from Tokyo.The aircraft, featuring a high-density seating configuration, was carrying 524 people. The crash killed all 15 crew members and 505 of the 509 passengers on board, leaving only four survivors. An estimated 20 to 50 passengers survived the initial crash, but died from their injuries while awaiting rescue. The crash is the deadliest single-aircraft accident in aviation history[1] and remains the deadliest aviation incident in Japan.[2]Japan's Aircraft Accident Investigation Commission (AAIC),[3]: 129  assisted by the U.S. National Transportation Safety Board,[4] concluded that the structural failure was caused by a faulty repair by Boeing technicians following a tailstrike seven years earlier. When the faulty repair eventually failed, it resulted in a rapid decompression that ripped off a large portion of the tail and caused the loss of function of all hydraulic systems and flight controls.AircraftThe Boeing 747SR-46 with registration JA8119 was built and delivered to Japan Air Lines in 1974. It had accumulated slightly more than 25,000 flight hours and 18,800 cycles (one cycle consisting of takeoff, cabin pressurization, depressurization, and landing).[1] On June 2, 1978, while operating Japan Air Lines Flight 115 along the same route, JA8119 bounced heavily on landing while carrying out an instrument approach to runway 32L at Itami Airport. The pilot then excessively flared the aircraft, causing a severe tailstrike on the second touchdown. Of the 394 people on board, 25 sustained injuries, 23 minor and 2 serious. The tailstrike cracked open the aft pressure bulkhea