MIL-DTL-81928C(AS)
b. Successful completion of an operational checkout verifies system operation. Procedures
shall concentrate on fault isolation and the identification of failures and malfunctions.
c. Procedures will normally trace one malfunction at a time. However, multiple failures are
possible and shall be considered in the testing processes.
d. If several components are suspected, the one most likely to have failed shall be considered
first.
e. If a test result is not obtained, the malfunction symptom shall be keyed to the appropriate
part of the troubleshooting diagram. However, if there is only one remedy for a specific
malfunction, the remedy may appear following the appropriate checkout procedural step.
f. Whenever a component is replaced, testing should be restarted to ensure that the
replacement did not introduce a new fault into the system. This assumption shall not be
interpreted as a requirement to repeat an entire system checkout in all cases.
3.3.2.3.3 Integrated system. Integrated system troubleshooting procedures shall be
presented in two levels: first, the integrated system as a unit, and second, the systems that make
up the integrated system. At the integrated system level, troubleshooting should consist of a set
of procedures leading to visual or aural indication, readout, or display. The logic tree diagrams or
fault-probable-cause troubleshooting tables are acceptable provided that a clearly defined path is
evident from the fault description to its probable cause and description. The operational test of
the integrated system is an operational check of the interdependent systems, less non-associated
systems. This procedure assumes that the maintenance technician performing the check is
qualified on the aircraft and is familiar with its systems and subsystems. The level of instruction
shall reflect this assumption. When a test is called for and the result is obtained, the process shall
continue through a new series of instructions leading to a new indication. If the sequence
produces all the desired results, it shall be assumed that the system/subsystem is operating
satisfactorily. If any result called for cannot be obtained, the fault isolation shall consist of further
instructions that will isolate to a subsystem and, if possible, to a component or interface wire.
Following the integrated system, the associated systems shall be presented in system and
subsystem order.
3.3.2.3.4 General requirements.
a. Introduction. An introduction, including an explanation of the testing and troubleshooting
format and techniques, shall be provided.
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