MIL-DTL-24784/20B (SH)
monitor weapon control functions, ensuring that the technician zeros in on the correct symptom
rather than a symptom indirectly resulting from the actual problem.
3.6.6.7 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)
causing the callout; and which references the entry point on the correct diagram for further
troubleshooting of casualty. This section shall also contain references to available lists of
swappable components and MAMs, supply data, and instructions for replacement or swapping of
suspected faulty parts. This section shall consist of a tabular listing of data related to system
troubleshooting routine callouts. The fault group index may be an automated printout if format
and legibility are retained and reproduced copy is clear and useable. The fault group index shall
contain an introduction describing the use of the table in narrative text. The fault group index
shall contain the following parts:
a. Fault group number. This shall consist of a column of callouts or typeouts listed
alphanumerically by unit number of the diagnostic test performed, and shall contain all callouts
applicable to unit casualties. Entries shall be spaced to facilitate inclusion of all corresponding
data in the other columns of the table.
b. Test. This column shall identify the diagnostic test number of the test that produced the fault
group callout.
c. Unit. This column shall identify the unit that was tested.
d. Card type. This column shall identify the part number of the suspected faulty card.
e. Reference designator. This shall consist of a column of all suspected faulty components
applicable to the corresponding fault group number. Entries shall be spaced one to a line of
type and shall be ranked by highest-to-lowest probability of causing the fault group number
callout, and pluggable components shall be listed preceding hard-wired components. The
reference designator shall describe unit number, cabinet or section number, subassembly
number, and component number.
f. Functional circuit diagram. This column shall identify the figure number of the FCD
associated with the suspected faulty card.
g. Circuit tested. This column shall identify the circuit that was tested.
h. Notes or remarks. This shall consist of notes, remarks, comments or amplifying data related to
repair of the casualty. (Examples of notes and data: Identification of Electrostatic Discharge
(ESD) sensitive parts; reference to applicable Fault Group Replacement Instructions; and so
forth).
3.6.6.7.1 Fault group replacement instructions. This section shall describe by procedural text,
the approved instructions for replacement or swapping of components identified by the fault
group index, including equipment lineups and restrictions and all applicable safety instructions.
This section shall also contain narrative references to technical manual sections describing the
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