MIL-PRF-32516
are commonly reported as no-fault-found (NFF) or as one of the quasi-NFF repair codes (e.g.,
cannot duplicate (CND), retest OK (RETOK), beyond capability of maintenance (BCM),
disassemble-clean-reassemble (DCR), etc.).
6.4.3 Fault isolation. The ability to locate the fault to a single/multiple conductive
path(s).
6.4.4 Conductive path. Includes but is not limited to: wiring, circuit board traces,
shields, bonding straps, connectors, jumpers, solder joints, connectors, etc.
6.4.5 Short duration fault. A short duration fault is a fault with duration under 100
nanoseconds and/or low resistance under 10 ohms. The random occurrence of these short
duration faults can cause problems in high frequency (10 MHz or higher) or sensitive or
critically balanced circuits.
6.4.6 Intermediate duration fault. An intermediate duration fault is a fault which has
duration between 101 nanoseconds and 501 microseconds and/or low resistance between 50 to
500 ohms.
6.4.7 Long duration fault. A long duration fault is a fault which has duration between
500 microseconds and 5 milliseconds and/or high resistance (500 ohm to open).
6.4.8 Failure. Equipment failure as used herein is any departure from the required
performance or operation outside of the required accuracies (not correctable by normal use of the
operating controls), or deviation from the criteria of 4.5 after the test is initiated.
6.4.9 Bench-top equipment. Bench-top equipment is designed to be used on a fixed
bench or table or on a mobile cart. Equipment that exceeds 5 kg in weight and has no handles, or
exceeds 20 kg with or without a handle, is considered to be bench-top equipment.
6.4.10 Depot maintenance. Maintenance performed on material requiring major
overhaul or a complete rebuild of parts, subassemblies and end items, including the manufacture
of parts, modifications, testing, and reclamation. Depot maintenance serves to support lower
echelons of maintenance by providing technical assistance and performing maintenance beyond
their capability. Depot maintenance provides stocks of serviceable equipment by using more
extensive facilities for repair than are available in lower level maintenance activities.
6.4.11 Open. An open, commonly referred to as an open circuit, is an abnormal or
unintended loss of continuity that can occur in one or more conductive paths in the LRU/WRA
chassis/backplane. This results in an interruption or loss electric current in the case of a power
circuit or an abnormal or interruption or loss of signal in one or more conductive paths. The
impedance of this conductive path is equal to the total impedance of the abnormal/unintended
conductive path. The open impedance of the abnormal/unintended conductive path is defined as
greater than 10 kilohms.
6.4.12 Short. A short, commonly referred to as a short circuit, is an abnormal or
unintended connection between two conductive paths in the LRU/WRA chassis/backplane. This
results in an increased electric current/over current in the case of a power circuit or an abnormal
or unintended signal on two or more conductive paths. The impedance of this conductive path is
equal to total impedance of the abnormal/unintended conductive path. The short impedance of
the abnormal/unintended conductive path is defined as less than 10 ohms.
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