MIL-DTL-24784/20B (SH)
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.
3.6.6 Chapter 5, Fault-isolation. Chapter 5 shall provide a high level overview of
troubleshooting methods, techniques, and procedures as well as detailed procedures, illustrations,
and an explanation of the use of the information presented for the identification, isolation and
correction of all system level and system interface related problems and casualties. The major
objective of the system fault-isolation procedures shall be described. In addition, a brief
description of each type of maintenance diagram shall be provided. This chapter shall also
provide procedures for the identification of system level casualties caused by and which must be
repaired at an individual equipment level and shall isolate these casualties to the applicable portion
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