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Old 25th Sep 2008, 09:49
  #1993 (permalink)  
Join Date: Dec 2004
Location: Andalucia
Posts: 720
Most LRUs (Line Replacable Units) are "on condition". It is rare for any easily replaced component to be anything else. Emergency equipment springs to mind as an exception. More major components like undercarrige legs and engines tend to be lifed, although the modern engine is slowly tending towards O/C with an ultimate life.
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