Flight 123 Crash
On August 12th, 1985 Flight JL 123 crashed into Mount Osutaka, 100km west of Huneda airport in Tokyo.
The crash was a result of incorrect maintenance.
The aircraft had undergone fuselage repair seven years earlier which had used two doubler plates instead of one, and over a small section of splice the rivets had bound only one of them.
The fault was unable to be detected by a visual inspection, and the reduced resistance to fatigue was not noticed until the incident investigation.
Similar?
Incorrect maintenance procedures also caused the crash of Flight 191 takeoff crash through increased fatigue.