MIL-DTL-24784/17B(SH)
conditions of associated system equipment that directly affect system operation shall be treated in
a similar manner.
3.6.5.2 Operating modes. The primary operating mode shall be discussed in detail, and alternate
modes shall be treated as modifications of the primary mode. Operating procedures common to
all modes shall be detailed under the primary mode and referred to under the alternate modes,
with such modifications of procedure as may be necessary. Each mode shall be described in the
logical sequence of major phases, events, options, supervisory commands and responsive actions,
and the following:
a. Only those equipment operational controls and indicators having system significance shall be
explained in the description. When controls must be actuated and indicators observed in a
sequence to achieve system operation, the descriptions will cite each control and indicator
with a number to indicate the position in the sequence.
b. Emphasis shall be placed, by the use of warnings on the safe operation of controls, which, if
operated improperly, could result in hazards to personnel or damage to the equipment. Each
control shall be followed by a brief description of its effects (equipment actuation or display
indication, or both) at the operator station and at remote stations. The primary mode
description shall be supported by both general and detailed illustrations.
c. Operational phases which involve operator judgment shall be illustrated by operational logic
diagrams. The diagrams shall indicate the conditions that must be favorable prior to an
operator action, or if unfavorable, indicate the alternate action. Illustrations showing dials,
gauges, status lights, and so forth, which indicate the favorable or unfavorable conditions shall
be included. Special procedures to be followed when an equipment failure may be bypassed
(as separate from emergency procedures) shall also be described.
3.6.5.2.1 Normal operation. The duties of system operators shall be described in terms of
general responsibility and specific step-by-step procedures (see MIL-DTL-24784) for operating
the system in all of the primary modes. Descriptive words (such as switch, button, dial, or
indicator) may be added to clarify the type of control involved, for example: "Press ACCESS
button and observe channel spot." All system controls and indicators provided for the use of
operators shall be covered. Controls and indicators provided only for maintenance and nonsystem
application shall not be called out.
3.6.5.2.2 Emergency operation. Step-by-step procedures shall be provided for emergency
operation of the system. If specially designated controls have been provided for emergencies, a
short statement shall be included describing how they modify or otherwise affect normal system
operation. Emergency procedures shall be supported by illustrations.
3.6.5.2.3 Special operation. Special operations such as test checkout, training, or evaluation
exercises shall be described. Illustration support shall include block diagrams and pictorial
diagrams.
3.6.5.3 Standard log form (model set). Standard log forms (see MIL-DTL-24784) and selected
data shall be developed and prepared and included in this chapter for all ship systems requiring
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