On Mon, 10 Sep 2007 11:22:12 -0400, The Visitor
wrote in
:
Remember this one?
http://tinyurl.com/yt3526
"a maintenance manager working for the company at Haneda committed
suicide to "apologize" for the accident."
520 Deaths for the want of a row of rivets:
http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123
The subsequent repair performed by Boeing was flawed. Boeing's
procedures called for a doubler plate with two rows of rivets to
cover up the damaged bulkhead, but the engineers fixing the
aircraft used two doubler plates with only one row of rivets. This
reduced the part's resistance to metal fatigue by 70%. According
to the FAA, the one "doubler plate" which was specified for the
job, (the FAA calls it a "splice plate" - essentially a patch),
was surprisingly cut into two pieces parallel to the stress crack
it was intended to reinforce, "to make it fit".[3] This negated
the effectiveness of one of the two rows of rivets. During the
investigation Boeing calculated that this incorrect installation
would fail after approximately 10,000 pressurizations; the
aircraft accomplished 12,319 take-offs between the installation of
the new plate and the final accident.