by Elizabeth Engler Modic, Senior Editor of Aerospace Manufacturing and Design

Intermittent Fault Detectors address the all too familiar No Fault Found and Cannot Duplicate situations within the avionics repair and maintenance business.

Aging aircraft electronic boxes often pose huge maintenance challenges, and maintenance cost management challenges, across all aviation operations. Subsequent to a malfunction during flight, an avionics assembly often tests "good" or "No Fault Found" when bench tested. The avionics repair and maintenance shop dispositions the box No Fault Found (NFF) or Cannot Duplicate (CND) during the ground test, and sends it back into service, only to have the intermittent malfunction reoccur.