MIL-DTL-24784/20B (SH)
troubleshooting principles presented in the manual. The section shall describe the troubleshooting
data in Chapter 8 and show how it relates to the data in Chapter 5.
3.6.9.3.4 Troubleshooting index. The troubleshooting index shall be presented in tabular form.
The index shall list all equipment, major and supporting functions in alphabetical order, provide
references to the technician to the appropriate procedures and diagrams that area to be used to
troubleshoot a specific function (see MIL-DTL-24784).
3.6.9.3.5 Relay and lamp indices. These indices shall be prepared in tabular form for all relay
coils and indicator lamps. The relay and lamp indices shall include the item reference designation,
the functional name, energizing voltage, and a reference to the troubleshooting diagram(s). Any
components which are part of a circuit card assembly that is a lowest replaceable unit shall not
be listed on the component indices (see MIL-DTL-24784).
3.6.9.3.6 Protective device index. This index shall list all protective devices, such as fuses,
circuit breakers, and so forth. The index shall include the item reference designation, front panel
marking of the device, trip-out value of the circuit breaker and rating of fuses, name of the circuit
protected and a reference to troubleshooting diagram(s) (see MIL-DTL-24784).
3.6.9.3.7 Maintenance turn-on procedure. Include a maintenance turn-on procedure to energize
the equipment from the fully de-energized condition to full operation (see figure 20-39). This
procedure shall enable the technician to determine which major function or supporting function is
malfunctioning. Each step of the procedure shall include the action to be taken (STEP), the
observation to be made (OBSERVE), and shall presume that normal conditions have been
observed in previous steps. Reference shall be made to the procedure for troubleshooting or
corrective action to be used (REFERENCE) if the observation is out of tolerance. Built-in
monitors, such as meters, dials, lamps, and so forth, shall be used when possible for making
observations, as opposed to the use of external test equipment. The procedure is complete when
the equipment is fully energized and all switches and controls are positioned for proper operation.
3.6.9.3.8 Troubleshooting procedures. Specific troubleshooting methods and procedures shall
be presented to direct fault identification, fault-isolation, and fault repair or correction, at the
equipment level. The procedures shall provide for the analysis of switching combinations and
observable indications (dials, gauge lamps, and meters). The use of any required test equipment
shall be described. The procedures shall support the troubleshooting diagrams (see 3.6.9.3.9).
The supporting diagrams shall be referenced by figure number. Prerequisite control settings,
conditions, tools and test equipment, shall precede each procedure.
3.6.9.3.8.1 Fault group index. The fault group index shall provide a list of suspected faulty
assemblies and parts for a fault group number callout resulting from the performance of specific
diagnostic fault detection routines performed at the system level. Use of this section shall enable
maintainers to swap or replace suspected faulty parts identified by troubleshooting routines with
the use of MAMs, replacements from the supply system, or redundant parts available within the
system. The fault group index is used for repair of a failure. The fault group index shall consist
of a list of callouts or typeouts which list the reference designator of suspected faulty part(s)
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