MIL-DTL-24784/17B(SH)
and an explanation of the use of the information presented. The major objective of the system
fault-isolation procedures contained in Chapter 7 shall be described. In addition, this shall contain
a brief description of each type of maintenance diagram. A fault directory shall be included which
relates fault symptoms found during operation to the fault-isolation procedures. Fault-isolation
procedures, fault logic diagrams, control function diagrams, and data function diagrams shall be
included as follows:
a.
Operation-based symptom fault directory.
b.
Fault-isolation procedures.
c.
System fault logic and troubleshooting maintenance dependency matrix diagrams.
d.
System control function diagrams.
e.
System data function diagrams.
When a separate depot-level manual is required (see 6.2), it shall include the information required
by MIL-DTL-24784 and MIL-DTL-24784/7.
3.6.8.1 Operation-based symptom fault directory. The directory shall relate system faults
observed during operation described in Chapter 4 to fault-isolation diagrams. The directory shall
be presented in tabular form by operational modes (see figure 17-11). The tables shall include
references to system fault-isolation diagrams, and where applicable, directly to equipment
troubleshooting diagrams. Table content shall include, as applicable, the following information:
a.
Table headings. Table headings shall be identified by the operational mode to which the table
relates.
b.
Column headings. The fault directory shall contain the following columns:
1.
Column 1, Operating procedure step. This column shall list the step of the operation
procedure in Chapter 4 for which a fault symptom can be observed. (For example, if
step 1 is an action step "set XYZ switch to ON" with no operational response, step 1
would not appear in the column. However, if step 1 stated "Set XYZ switch to ON and
check to see that XYZ lamp lights," then step 1 would be included in the column.)
2.
Column 2, Functional description. This column shall include the reference to the
paragraph number of the functional description in Chapter 5. In addition, when an
operation can be identified with an output, this column shall also contain the name or
symbol of the output.
3.
Column 3, Fault-isolation procedure. This column shall reference by paragraph number
the fault-isolation procedure.
4.
Column 4, Alignment procedure. This column shall reference by paragraph number the
alignment procedure in Chapter 8.
5.
Column 5, Fault-isolation diagram. This column shall reference the fault-isolation
diagram by figure and sheet number.
6.
Column 6, Equipment document. This column shall reference the equipment technical
manual when the fault can be isolated to the specific equipment causing the fault.
3.6.8.2 Fault-isolation procedures. Procedures shall be included for isolation of a trouble to a
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