Universal Synaptics Corp.

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Monday, 20 Oct 2014

No Fault Found (NFF)

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The maintenance of aircraft electronic Line Replaceable Assemblies (LRUs) and Weapon Replaceable Assemblies (WRAs) pose an ever increasing challenge.  Much of the challenge is related to intermittent faults which occur because of aging wiring and connections.  These intermittent problems manifest themselves as "bad actor" LRUS and WRAs or as repair shop No Fault Found (NFF) and Cannot Duplicate (CND) test results. 

Universal Synaptics has a proven shop maintenance tool that augments traditional testing methods by providing an Intermittent Fault Detection and Isolation System (IFDIS) which can be used to identify and isolate intermittent faults, as well as any other wiring problems in complex LRU and WRA chassis’ and aircraft wiring. 

Intermittent faults are a growing problem in electronic equipment.  As integrated circuits (ICs) and other electronic discrete parts become increasingly capable and reliable, an ever growing portion of the electronic equipment maintenance problems encountered are not component failure, but rather interconnectivity problems between the electronic piece parts.

The intermittent can be caused by a loose or corroded wire wrap, a cracked solder joint, a corroded connector contact, a loose crimp connection, a hairline crack in a printed circuit trace, or via’s, or a number of other phenomena, all very common in electronic equipment.  Many times the intermittent open circuit will manifest itself during an initial troubleshooting test, such as in the electronic back shop of a commercial repair facility or military flying wing, but by the time the equipment item has been transported to a commercial or military depot for repair the intermittent circuit is no longer open.  This results in NFF.   Some LRUs and WRAs now test NFF over 50% of the time when inducted into the repair shop.

Solve your NFF problems today 801.731.8508

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