What exactly happened to Japan Airline 123?
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In-flight structural failure due to improper maintenance, leading to rapid decompression, destruction of control systems and loss of control.
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 in 1978. The rear bulkhead of the plane had been repaired with an improperly installed doubler plate, 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 failed, causing a 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 of the passengers survived the initial crash but subsequently died of their injuries hours later while awaiting rescue. It is the deadliest single-aircraft accident in aviation history.
https://en.wikipedia.org/wiki/Japan_Airlines_Flight_123
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