MIL-DTL-24784 / 21B (SH)
and illustration shall be kept to the minimum required to ensure understanding of the material in
the tables. This section shall contain, but not be limited to, the following sections.
a. A list of redundant (identical) pluggable electronic components shall be provided to facilitate
the interchange of parts in use within the equipment. The list of components shall appear in
tabular form with items grouped by part number and arranged in alphanumeric part number
order. The list shall include reference designators for each part number listed. Reference
designators shall be arranged in ascending order with the least critical component appearing
first. A maximum of ten reference designators shall be listed for any component used more
than ten times within the equipment. Non pluggable items and items having minor degrading
impact on the equipment shall not be listed (Example: indicator lamps and light bulbs). This
table shall be titled "Component Interchangeability."
b. A list of Maintenance Assistance Modules (MAMs) shall provide a tabular listing of the
equipment MAMs. This table shall be titled "Special Purpose Test Equipment - MAMs."
3.6.6.5 Diagnostic descriptions. This section shall identify and describe all performance
monitoring and fault localization tests supporting the equipment.
3.6.6.6 Diagnostic operating procedures. Step-by-step procedures shall be provided for
operating all equipment diagnostic operating procedures.
3.6.6.7 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 21-37). 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.
3.6.6.8 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 3.6.6.9). The
supporting diagrams shall be referenced by figure number. Prerequisite control settings,
conditions, tools and test equipment, shall precede each procedure.
3.6.6.8.1 Maintenance concept. The beginning of the troubleshooting section shall describe the
maintenance concept for fault detection, fault localization, and fault-isolation and repair. The
section shall contain a flowchart to aid the maintainer by illustrating the philosophy behind the
method used to troubleshoot casualties.
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