MIL-DTL-81928C(AS)
3.3.2.2 Description and principles of operation. The description and principles of operation
WP shall contain two primary paragraphs, "Description" and "Principles of Operation." The
description and principles of operation may also be divided into separate WPs "Description" and
"Principles of Operation", depending on the complexity of the equipment.
3.3.2.2.1 Description. This element shall cover a general physical description of the system
or component. Locator illustrations showing access panel location and arrangement of the
assemblies or components shall be provided. Nomenclature shall remain consistent throughout
this data element and all other data elements of the manual. The description shall contain the
functional element of "controls and indicators." A separate operation instruction manual shall not
be referenced for "controls and indicators."
3.3.2.2.1.1 Controls and indicators. The functional element of "Controls and Indicators"
shall provide the purpose, use, and function of all operating controls and auxiliary equipment, or
attachments furnished with the equipment. The coverage shall also provide interpretation of
typical instrument readings (with acceptable limits stated) and indicator presentations to inform
the operator what recognizable results he or she should expect to observe during each mode of
operation. The data should be presented by an illustration and related table, referenced from a
brief paragraph explaining the purpose and scope of the coverage, as required:
a. Illustration. (See MIL-DTL-81927.) The purpose of the illustration is to identify each
control and indicator, placard data, and location. The figure title shall identify the end
item nomenclature and "Controls and Indicators." Each control or indicator shall be
identified by an index number (with leader line) identifying the location and related placard
data. Index numbers shall be assigned in logical sequence related to location of the item.
The illustration may be a partial-page, full-page, multiple view, or foldout illustration, as
best suited to the combined presentation requirements.
b. Table. (See MIL-DTL-81927.) The purpose of the table is to provide the required data
for each control and indicator. The table shall be prepared as a full-page-width numbered
table in accordance with MIL-DTL-81927. The table title shall identify the end item
nomenclature and "Controls and Indicators" (identical to the figure title). The table shall
provide, but not be limited to the following coverage:
(1) "Figure (*)/ Index No." column. (The * represents the figure number of related
illustration.) This column establishes the content of the table. Each index number
contained on the illustration shall be listed in numerical sequence.
(2) "Ref Des" column. The item's reference designation shall be entered.
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