MIL-DTL-81928C(AS)
maintenance personnel in the recognition and interpretation of system and subsystem
faults. The manual shall present fault isolation procedures for identification of specific
discrepancies and recommendations for maintenance actions. The following guidelines
shall apply to preparation of the fault isolation manual technical content:
(1) The manual shall include baseline step-by-step procedures dedicated to the
identification and isolation of faults identified and reported by the fault reporting
manual.
(2) Procedural steps shall guide the maintenance technician through the various
troubleshooting steps which eliminate possible, if unrelated, fault corrections and zero
in on detection of the actual fault. The presentation shall be made in such a manner
that positive reactions will permit circumventing or eliminating subordinate or
unaffected steps, thus reducing the time to fault isolate.
(3) Fault logic shall be carried to the level of identifying the replacement of a Weapon
Replaceable Assembly (WRA), or discovery of a wiring, adjustment or rigging
problem. All attempts shall be made to fault isolate to a single WRA replacement.
However, if the fault logic fails to reduce to the possible faults as specified, references
shall be made to the system trouble-shooting and its supporting schematics for further
investigation.
(4) Upon isolating to a given discrepancy, reference to the applicable technical manual
and WP shall be made to obtain procedures for direct replacement, wiring correction,
adjustment or rigging procedure as may be required.
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