Japan Airlines Flight 123

Japan Airlines Flight 123 was a scheduled domestic passenger flight from Tokyo to Osaka that crashed in Japan on 12 August 1985 after a structural failure caused explosive decompression.

Japan Airlines Flight 123 was a scheduled domestic passenger flight from Tokyo to Osaka that crashed in Japan on 12 August 1985 after a structural failure caused explosive decompression. It remains the deadliest single-aircraft accident in aviation history, with 520 fatalities and only four survivors.

Accident

Japan Airlines Flight 123 was a domestic passenger flight from Tokyo to Osaka that departed on the evening of 12 August 1985. About 12 minutes after takeoff, the aircraft suffered explosive decompression due to a structural failure. It lost pressurization and remained airborne for roughly 30 to 32 minutes before crashing into mountainous terrain near Mount Osutaka.

Investigation and cause

The official investigation concluded that an improperly repaired aft pressure bulkhead failed, causing explosive decompression and progressive structural damage. The accident is widely cited as a major case study in maintenance and repair oversight.

Casualties and survivors

Of the 524 people aboard, 520 died and four survived. The crash scene and the delayed rescue response became important parts of the accident’s public memory.

Legacy

The disaster remains a landmark event in aviation safety history because it exposed the consequences of structural repair failure and loss of hydraulic control. It is also remembered in Japan as a major national tragedy.