August 12, 1985
Mt. Osutaka, near Ueno Village, Japan
Japan Air Lines, Fight 123
Boeing B-747-SR46

The aircraft suffered an aft pressure bulkhead failure at 23,900 ft. The aircraft had severe control difficulties with loss of all controls and eventually after 40 minutes, collided with a mountain. Improper repair of bulkhead by Boeing engineers after a tail strike in 1978.  Five-hundred-twenty out of 524 aboard were killed.