Kaitak From Ireland, joined Aug 1999, 12678 posts, RR: 34
Reply 2, posted (15 years 2 months 3 weeks 2 days 6 hours ago) and read 2510 times:
It was actually a 747SR-46, which had the standard 747 body. It was involved in a tailstrike in Osaka in 1978. It was repaired incorrectly by Boeing, through the use of single instead of double rivets on the rear pressure bulkhead.
The aircraft took off on the 12/8/85, operating JL123 to Osaka from Haneda. Its rear pressure bulkhead failed and despite the best efforts of the crew, the loss of hydraulic power was such that the aircraft became uncontrollable and eventually ploughed into Mt. Osutaka, in a mountain range which was actually only about 30-40 miles east of HND, across Tokyo Bay. 520 died and 4 survived.
A Boeing metal expert subsequently discovered in tests that the number of cycles flown in a simulation, based on the repair carried out was almost exactly the same as that flown by the 747 since the Osaka incident.
Skylinepigeon From , joined Dec 1969, posts, RR:
Reply 3, posted (15 years 2 months 3 weeks 2 days 4 hours ago) and read 2508 times:
The JL123 accident is thoroughly analysed, along with other airline crashes between 1977 and 1991, in Air Disaster Volume 2 by Macarthur Job. This is published by Aerospace Publications Pty Ltd of Australia, ref. no ISBN 1 875671 19 6. This book (along with Volumes 1 & 3) is highly recommended.
American 767 From United States of America, joined May 1999, 4091 posts, RR: 12
Reply 4, posted (15 years 2 months 3 weeks 2 days 3 hours ago) and read 2491 times:
AIRLINERS.NET CREW FORUM MODERATOR
Kaitak is right. Like he explained, the disaster was due to a bulk pressure loss as well as hydraulic power loss which made the crew unable to control the aircraft. The plane involved was a 747SR-46. It was a 747-100SR, 46 is Japan Airlines's customer number at Boeing. JAL has never had any 747-SP.
Blah From Australia, joined Dec 2008, 0 posts, RR: 0
Reply 6, posted (15 years 2 months 3 weeks 2 days 3 hours ago) and read 2486 times:
Thanks for the source Skylinepigeon. I was wondering if you knew how in depth this book is. I am in need of some fairly technical information. I checked out a website that sold this book, and it is a reasonable price, so if you can tell me a little more about it, I'll probably buy it.