MIL-DTL-81928C(AS)
of systems and subsystems should be supported by program listings and functional flow, logic, or
other diagrams required to ensure clarity of presentation. Logic diagrams may include system
operational modes.
3.3.2.2.2.3 Integrated systems. The principles of operation of the several systems that make
up the integrated system shall be contained in each system manual. The depth of the text and
illustrations placed in the various systems manuals shall be sufficient that the maintenance
technician will be able to understand the makeup and operation of each system, as an individual
unit. In the integrated systems manual, the operational dependency of each individual system shall
be defined in sufficient detail to support basic integrated system training, ease understanding and
comprehension and satisfy the explanation of relationships required for integrated troubleshooting
and maintenance between systems. The descriptive material shall be supported by schematics,
functional block diagrams, and signal flow charts. Modes and submodes of operation shall be
identified, as applicable. This shall include systems interdependency. The various operational
modes shall be described and highlighted as closed loops.
3.3.2.3 Testing and troubleshooting. These functional elements shall provide procedures for
detection, isolation, and correction of failures or malfunctions.
3.3.2.3.1 Depth of coverage. The tasks shall include methods of determining the cause of
the fault and isolation to the appropriate adjustment, a replaceable part, interface wires, or
mechanical linkage. Troubleshooting procedures shall include steps required to enable the
technician to isolate equipment failures. Instructions shall direct adjustment, repair or
replacement of parts. Schematics are required as backup data and shall be referenced or
contained in the same WP. The schematics shall integrate fluid, mechanical, electrical, and
electronic components. The schematics shall include both a visual description of the system and
technical backup information for troubleshooting procedures.
3.3.2.3.2 Method of presentation. (Refer to MIL-DTL-81927.) Operational check
procedures, combined with troubleshooting data, shall guide the technician to the cause of the
equipment failure or malfunction and its repair. All information required to perform these tests
and evaluations shall be incorporated, including all modes of operation. Troubleshooting
diagrams shall be prepared to support testing procedures. These diagrams shall be referenced in
the applicable troubleshooting WPs. The procedures shall be based on the following assumptions:
a. Testing and troubleshooting procedures shall include all elements of pretest setup and
post-test shutdown.
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