Most aviation maintenance technicians would probably agree that intermittent faults are our nemesis and that finding and clearing those faults in aging aircraft is extremely problematic. The resources involved in endless troubleshooting and line replaceable unit (LRU) swapping has a huge impact on manpower allocation and budgets. We aren't doing so well if we use first time fixes, no fault found (NFF), cannot duplicate (CND) logbook entries, and LRU replacements as the measure of our effectiveness. There also may be a good argument that we are part of the problem.
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