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The original was posted on /r/todayilearned by /u/paragon-interrupt on 2024-03-07 00:26:26.

Original Title: TIL in 1985, Japan Airlines flight 123 crashed and over 500 people were killed. The plane’s aft pressure bulkhead was damaged seven years prior, but was not repaired correctly. When it failed, the crew lost all control of the plane. Only four people survived.