Reality check. MD11 (SR-111)

Date:         10 Jul 99 02:33:28 
From:         JF Mezei <jfmezei.spamnot@videotron.ca>
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Found an interesting letter about the Swissair 111 crash at the (Canadian)
Transportation Safety Board, dated december 1998.

http://bst-tsb.gc.ca/eng/about/emergency/Safety_Advisory/esafety_swiss.html

Essentially, in inspecting MD-11s in 2 maintenance facilities they found
chaffed wires in certain areas and found it necessary to issue an AD
requiring MD11 operators to make checks.

Question: is the nature of this letter very routine (eg: such problems
commonly found) or would it describe a more serious situation ?

And about chaffed wires: would finding wires in such condition be common
on any plane of age similar to MD-11 fleets or would such a problem
generally be associated with much older planes from the 70s ?