MIL-DTL-24784/17B(SH)
single equipment or functional area of an equipment. 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
system fault-logic, control function, and data function diagrams (see MIL-DTL-24784). The
supporting diagrams shall be referenced by figure number. Prerequisite control settings and
conditions shall precede each procedure.
3.6.8.3 System data function diagrams. System data function diagrams shall show in detail the
system information needed to isolate faults within signal or data flow paths. Data function
diagrams shall include tolerance values and shall contain references to equipment publications
where necessary. All inputs required to develop the output shall be shown. The data function
diagrams shall be constructed in accordance with the following:
a. Titles of diagrams shall correspond to the signal flow described.
b. Show all test points necessary to isolate the trouble to the lowest level of hardware block (for
example, subassembly). Include test parameters required to define satisfactory operation.
Where signal flow diagrams depict signal flow in more than one mode of operation, that data
shall be presented on the apron for all modes. Apron notes shall also include test data for test
equipment setup. All inputs and outputs shall have signal description information.
c. References shall be made to the functional description, troubleshooting procedures, corrective
actions, and so forth, as appropriate by paragraph number. Normally these references shall be
included with the notes.
d. The display of more than one function or mode of operation on one diagram shall be allowed
only when clarity is not sacrificed and the functions are relatively simple.
e. Screwdriver adjustments, dial adjustments, and adjustable controls shall be shown.
f. All built-in controls and monitoring devices shall be shown. Do not show external test
equipment, unless it is a permanent part of the equipment.
g. Hull grounds, chassis grounds, signal grounds, and power grounds shall be shown.
h. All leads of motors, generators, synchros, and so forth, shall be identified.
i. All relay coils that are energized by the signal shall be shown.
j. All relay contacts and relay terminals in the flow path shall be shown and identified. All relay
contacts shall be depicted in operational mode. References to control diagrams on which the
relay coils appear shall be shown adjacent to the relay contacts.
k. Signal paths shall be identified by weighted lines and arrowheads.
3.6.9 Chapter 8, Alignment procedures. Chapter 8 shall present the corrective adjustment
procedures and support information necessary to restore electrical and mechanical alignment
between the various system equipments. All values and tolerances shall be included. The
alignment shall be cross-referenced to respective fault-isolation procedures and diagrams in
Chapter 7. Alignment procedures shall include references to equipment publications where
further procedures are required at the equipment level. The alignment procedures shall be
presented in step-by-step form.
3.6.10 Chapter 9, Installation data. Chapter 9 shall present installation drawings and information
not contained in the equipment technical manual necessary to install and checkout the system:
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