MIL-DTL-81919C(AS)
(4) "Position/Mode" column. When the item has more than one position or mode of
operation, each position and mode shall be listed and the specific function aligned to
the appropriate combination of mode and position. When the specific function is
controlled by the mode, and the mode is controlled by a different control, the related
mode with the controlling data may be entered in the "Function" column and the
"Position/Mode" entry shall be aligned with the related function. If necessary for
clarification, a notation may be made in the column and provided below the table or
by reference to text with appropriate illustration(s), including a matrix of the modes
and positions to function.
(5) "Function" column. The following shall be entered: 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 indictor presentations to inform the
operator what recognizable results should be expected during each mode of
operation. When the item has more than one function (position or mode), the
function shall be aligned by the position and/or mode entry and provide only the
related data. If necessary for clarification, a notation may be identified the column
and provided below the table or by reference to text with appropriate illustration(s),
including a matrix of the modes and positions to function.
3.3.1.2 Principles of operation. The intent of this subject is to support the qualified
maintenance technician with reference material that may be required to troubleshoot and to
support on-the-job training of less qualified maintenance personnel. The principles of operation
paragraph, or WP(s), shall contain a functional block diagram that depicts the operation of the
equipment and the text shall be written to, and in support of, the functional block diagram. The
principles of operation shall define the purpose and functions of the equipment, the technical
characteristics and other general information to be used by maintenance personnel to enable
understanding of the equipment and its related systems. If the manual covers more than one
model, the significant differences shall be explained.
3.3.1.2.1 Presentation. The principles of operation shall consist of a functional narrative
written to help understanding of the equipment operation (electrical/electronic, hydraulic,
pneumatic, and mechanical). This narrative shall be to the depth necessary to support fault
isolation to the level directed by the Logistic Support Analysis (LSA) and/or MP. The operation
of the equipment and related system/components shall be presented in a logical flow. Significant
input, output, and control signals, supply voltages and power supply output voltages shall be
identified. Functional block diagrams shall be provided. If the equipment operates in more than
one mode, each mode shall be explained and supported by a functional block diagram. When the
LSA/MP directs fault isolation to the bit and piece component(s), the principles of operation shall
describe detailed circuitry supported by block diagrams showing pertinent components only.
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