MIL-DTL- 24784/11C(NAVY)
(3) Unit 3 - Principles of operation. This unit shall describe system or independent auxiliary machinery
plant operations, list applicable precautions, and discuss applicable operating stations. This unit shall
convey information in an explanatory and descriptive manner as to what operations can be performed
by or with the system or independent auxiliary machinery plant. Reference shall be made to
corresponding operating instructions in Section II for detailed step-by-step instructions, as applicable.
Operations shall be discussed under the headings of Normal, Starting, Securing, Infrequent, Abnormal
and Emergency. Abnormal operation shall be defined as an operation that results when specific
equipment or components of a system or independent auxiliary machinery plant is not available for
service. Emergency operation shall be defined as that operation performed as a result of a
malfunction or maloperation of a system or component, the consequences of which prevent or
seriously restrict the operation of the system or independent auxiliary machinery plant or jeopardizes
the safety of ship, personnel, or both.
g.
Section II - Operating instructions. This section shall be further subdivided into the four units described
below:
(1) Unit 1 - Introduction. This unit shall simply describe the content of the section and reference the
principles of operation described in Section I.
(2) Unit 2 - Initial conditions and precautions. This unit shall specify those initial conditions that provide
a starting point for each operating instruction and shall caution and instruct, and familiarize the
operators so that they fully understand the extent of the operation to be performed and its effect on
system and independent auxiliary machinery plant conditions. Operators shall also ascertain whether
the instruction can be accomplished without conflicting with other operations. Initial conditions shall
be based on valve lineup shown on the system and independent auxiliary machinery plant diagrams
for normal operations. Lineup should not conflict with (EOSS) or current configuration.
(3) Unit 3 - Procedures. This unit shall cover detailed step-by-step procedures for performing the
operations of the operating instruction under normal conditions. Where necessary, steps or
instructions shall be emphasized by the use of a NOTE, CAUTION, WARNING, or DANGER to
ensure safe procedures (see MIL-DTL-24784). Each operating instruction shall be provided with a
minimum valve lineup table for performing the instruction or portion thereof. Procedures shall
specify which steps may be performed in any sequence or in parallel. Procedures shall also include
statements, which permit the crew to omit certain steps under certain conditions, while still ensuring
that crucial steps are performed in proper sequence. In addition, procedures shall be written to permit
the crew to enter a procedure at any point, provided the conditions at that point are the same as they
would have been had the procedure been performed starting from the initial condition stated in the
procedure. Operating procedures in each chapter shall be based on the following format:
(a)
Initial conditions.
(b) Precautions.
(c)
Summary check list (for immediate action on casualties only).
(d) Operations flow diagrams (for complex evolutions only).
(e)
Detailed procedure.
(f)
Notes and references to other operating instructions within the volume shall be minimized.
Wherever possible, operating procedures shall be written to cover a single evolution and shall
not contain extra steps intended to make the procedure cover more than one evolution.
(4) Unit 4 - Backup operation. This unit shall be used for those systems and independent auxiliary
machinery plants that have backup methods of operation and shall be addressed as being performed
only when the procedures of Unit 3 are not practicable or possible. Backup operations relating to the
failure of any component or system that forms part of the heating, ventilation, and air-conditioning
portion of the CPS shall be exactly delineated, especially with respect to the loss of pressurization in a
CPS zone.
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