"David Cartwright" writes:


You can't be sure, after all, that whatever caused the fault in one engine
won't do so in another. I remember reading of an incident in a three-engine
aircraft (DC-10?) where a mechanic changed the magnetic chip detectors
(little screw-in plugs that attract particles of metal that have worn off
the engine so you can analyse them) and replaced them with new ones that
didn't have their rubber seals fitted. So all three engines ran low on oil
some way into the flight. Initially they thought there was a spurious oil
leak (ruptured/worn pipe or whatever) in the engine that failed first, only
to see the oil pressure drop on the other two first!

I think it was an L-1011 belonging to National. It made it to Miami Beach,
or almost...

As a result, ETOPS has strict segregation rules. No mechanic works on
both engines, etc.
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