MIL-DTL-87268D
3.3.5.14 Locator graphics. A locator graphic shall consist of a labeled graphic together with required
callouts. Locator graphics, when used, shall either be an option, or an automated part of the procedural or
descriptive information presented, as speciied by the acquiring activity (see 6.2m).
3.3.5.14.1 Placement. Placement of locator graphics shall be fully integrated with the associated technical
information.
a. The individual equipment items, e.g., parts, switches, controls, indicators, and other items, shall
be shown in physical context to the major equipment components of the illustrated hardware. The
nomenclature of the major equipment component shall be shown on the graphic.
b. Index numbers on callouts shall be assigned, if required, on the equipment item locator graphic
either: in clockwise sequence, or in the sequence that the item is discussed in the procedural steps.
c. When reference is made to an illustrated equipment item in a procedural step, the step reference
shall be keyed directly to the relevant equipment item, e.g., part, switch, control, indicator, or
other item, by a callout reference citation from the text, e.g., item name, or an index number and
a leader line pointing to the referenced item.
3.3.5.14.2 Successive locator graphics. Successive locator graphics may be used in lieu of a single graphic
to lead the user systematically from a large overall (general) view to successively lower level (speciic)
views in a logical presentation sequence. Item exploded views shall be used as locator graphics only
where further disassembly is required.
3.3.5.14.3 Minimum Graphics Size. The minimum size of the locator graphics shall provide suficient
resolution to enable the user to quickly identify the surroundings and the item to be located with
respect to the surroundings.
3.3.5.15 Callouts and Leader Lines. Callouts and leader lines shall be provided to identify speciic features
of interest on graphics. The following provisions for callouts shall be followed:
a. Callouts shall be keyed to the procedural steps or descriptive information displayed.
b. Callouts and identiier numbers shall not be crowded into spaces between graphic elements;
callouts shall be clearly distinguishable from the graphic elements and each other.
c. Labels used for part names or other graphic element identiiers instead of index numbers shall be
identical to those used in the associated text.
d. Leader lines (with arrow heads) shall be drawn from the index number to the equipment item.
e. Leader line width shall differentiate from graphic line width.
f. Leader lines shall not obscure essential graphic detail.
g. Leader lines shall not cross graphic lines if, an alternative is possible.
h. Leader lines shall be straight wherever possible.
i. When straight lines are not possible, leader lines shall have one bend at an angle of 45 degrees,
drawn with the angled end pointing to the graphic.
j. Leader lines shall not cross or come in contact with other leader lines.
3.3.5.16 Style requirements for animated information. The motion of the animated information shall be
easily discernible by the user and clearly differentiated from the background and other static information
of the overall display.
3.3.6 General style requirements for audio information. Audio information shall consist of non-verbal auditory
tones, or computer generated or electronically stored speech. Redundant visual information shall be provided
to ensure effective information presentation when the audio output device is not available or functioning.
3.3.6.1 Requirements for non-verbal auditory tones. Non-verbal auditory tones shall be limited to
applications where immediate discrimination is not critical to personnel safety or system performance.
Non-verbal auditory tone frequencies shall range between 200 to 5000 Hertz (Hz), preferably between 500
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