Japan Airlines B747-100-SR (JA-8119) that crashed on 12 August 1985 then you are mistaken on two points of fact :
[1] The crash did not result in “the loss of all aboard”.
True. 4 out of 524 survived.
[2] The rear bulkhead repair was carried out by Japan Airlines engineers in Japan, not at the Boeing factory. Whilst Boeing did design and approve a repair scheme, the repair that was embodied by the Japan Airlines engineers was not in accordance with the approved design.
A team of Boeing engineers was present during the repair. They may not have carried out every single piece of repair, but Boeing admitted responsibility to the US Supreme Court, viz:
Based on admissions made by Boeing in a pretrial conference, the trial court entered a judgment dated July 24, 1987.
The court found that Boeing admitted the following:
a. In 1978 Boeing repaired the aft pressure bulkhead
of the accident airplane in Japan;
b. Boeing performed a portion of the bulkhead repair
incorrectly;
c. The incorrect repair performed by Boeing was a
proximate cause of the crash of the accident airplane
on August 12, 1985; and
d. Boeing is liable to plaintiffs for compensatory
damages resulting from the crash.
http://www.mrsc.org/mc/courts/suprem...15wn2d0123.htm