Quote:
Originally Posted by KelVarnsen
I hate to interrupt this conversation about Russian history with actual news but...
Kurt Hofmann
@atterseeluftfah
Crashed MetroJet A321 had been delivered on May 9 1997 to Libanese MEA. Damaged by a tailstrike in 2001, returned to service Feb. 2002
660 NEWS Calgary @660NEWS
#BREAKING: A Russian aviation official says Russian passenger plane that crashed broke up at high altitude.
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That is bringing back memories of the JAL 747 that had the faulty repairs done to the aft pressure bulkhead, it failed at altitude and the crew tried to keep her flying despite losing pretty much the entire vertical stabilizer:
https://en.wikipedia.org/wiki/Japan_Airlines_Flight_123
Quote:
- The subsequent repair of the bulkhead did not conform to Boeing's approved repair methods. The Boeing technicians fixing the aircraft used two separate doubler plates, one with two rows of rivets and one with only one row when the procedure called for one continuous doubler plate with three rows of rivets to reinforce the damaged bulkhead.[24] The incorrect repair reduced the part's resistance to metal fatigue to about 70% compared to the correctly executed repair. According to the Federal Aviation Administration, the one "doubler plate" which was specified for the job (the Federal Aviation Administration calls it a "splice plate" — essentially a patch) was cut into two pieces parallel to the stress crack it was intended to reinforce, "to make it fit".[25] This negated the effectiveness of one of the rows of rivets. During the investigation, Boeing calculated that this incorrect installation would fail after approximately 10,000 pressurizations; the aircraft accomplished 12,318 successful flights from the time that the faulty repair was made to when the crash happened.
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