MIL-DTL-24784/20B (SH)
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 and remarks. This shall consist of notes, remarks, comments or amplifying data related
to repair of the casualty. (Examples of notes and data: Identification of ESD sensitive parts;
reference to applicable Fault Group Replacement Instructions; and so forth).
3.6.9.3.8.2 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
availability, location, and use of MAMs and redundant swappable components in use within the
system.
3.6.9.3.9 Troubleshooting diagrams. Troubleshooting diagrams shall consist of FLDs,
secondary FBDs, FCDs, and so forth, as required to support the system maintenance concept. All
diagram notes (general, apron, multiple page, and so forth), except for FBDs and FCDs, shall be
developed in accordance with MIL-DTL-24784.
3.6.9.3.10 Secondary FBD, lowest-level FBD, and FCDs. Refer to Chapter 5 for a discussion of
these diagrams.
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