Japan Airlines Flight 123
Japan Airlines Flight 123 was a scheduled domestic Japan Airlines passenger flight from Tokyo's Haneda Airport to Osaka International Airport, Japan. On August 12, 1985, a Boeing 747SR operating this route suffered a sudden decompression 12 minutes into the flight, and crashed in the area of Mount Takamagahara, Ueno, Gunma Prefecture, from Tokyo 32 minutes later. The crash site was on Osutaka Ridge, near Mount Osutaka.

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 died of their injuries hours later while awaiting rescue. It is the deadliest single-aircraft accident in aviation history.
Q213140
Japan Airlines
ORG
Q1490
Tokyo
LOC
Q204853
Haneda Airport
LOC
Q1046748
Osaka International Airport
LOC
Q179
Boeing 747SR
MISC
Q3892307
Mount Takamagahara
LOC
Q1346914
Ueno, Gunma Prefecture
LOC
Q3891235
Mount Osutaka
LOC
Q4698498
Aircraft Accident Investigation Commission
ORG
Q66
Boeing
ORG
Q1423039
tailstrike
Concept
Q1046748
Osaka Airport
LOC
Q3834411
deadliest single-aircraft accident
UNK
Q18173
Japan Airlines Flight 123
MEDIA
1985-08-12T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
August 12, 1985
DATE
1978-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1978
DATE
+12^^http://www.w3.org/2001/XMLSchema#decimal
12
NUMBER
+32^^http://www.w3.org/2001/XMLSchema#decimal
32
NUMBER
+15^^http://www.w3.org/2001/XMLSchema#decimal
15
NUMBER
start point
destination point
location
point in time
destination point
place served by transport hub