MIL-DTL-24784/19B (SH)
3.6.3 Chapter 2 - System general description. The information contained in this portion of the
manual shall briefly describe the weapon system and associated systems by combining physical
and general aspects of the respective equipment contained therein and their interdependencies and
interactions.
3.6.3.1 Weapon systems equipment. The general description shall identify each subsystem
group of weapon system equipment and each unit equipment in a group by composite illustrations
of the subsystem group of the first ship of the class, for example, the fire control subsystem. The
text shall only describe significant features of a particular component of an equipment in a group.
Significant features would comprise such items as console panels, subpanels, control and indicator
groups. Each component of an equipment in a group shall be called out as shown in figure 19-5.
3.6.3.2 Associated systems equipment. Associated systems equipment shall be shown in
separate group operational and functional interfaces with the weapon system. Examples of such
components include search radar distribution switchboard and radar order switches that control
the availability of weapon system planned-position indicator (PPI) displays, and units of the naval
tactical data system that control the transmission of target data to and from the weapon system.
3.6.4 Chapter 3 - System functional description. This chapter shall identify and define the major
weapon system functions. The highest threat level shall be considered the primary mode of
weapon system operation. Other modes shall be treated as secondary and, insofar as feasible, as
modifications of the primary mode. Thus, functions that are common to all modes shall be
described under the primary mode and referred to under the secondary mode, with such
modifications as may be necessary. Each function shall be analyzed by describing the origin of the
function and by stating how each pertinent equipment contributes to the purpose of the function.
Functions shall be covered in terms directly related to the system troubleshooting procedures and
diagrams in Chapters 7 through 9. Each functional analysis shall be presented in two levels,
simplified and detailed, so that personnel training based on this approach can adequately support
the concept. Descriptions shall be supported by illustrations which may include block diagrams,
geometrical diagrams, and functional diagrams.
3.6.4.1 Introduction to functional description. This portion shall briefly describe the system
interfaces and explain interrelationships between the subject system and associated systems and
equipment. The major system functions shall be introduced briefly, and the general approach used
in the description and analysis of the major function shall be explained.
a.
Weapon system interfaces. The descriptions of system interface relationships to associated
systems and equipment shall be supported by interface functional block diagrams that
illustrate system integration (see figure 19-6).
b.
Major system functions. All major system functions shall be listed and defined. Major
functions shall reflect the operational phases or events of the primary mode of system
operation. Secondary system modes, integration with associated systems, multiple-radar
synchronizing systems, evaluation instrumentation systems, and other such miscellaneous but
primary subjects, shall be treated separately as related functions.
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