MIL-DTL-87268D
3.3.5.1 Graphic conventions. Displayable graphics shall have a means for designating the minimum size at
which that graphic is capable of being discerned when physically displayed and whether that graphic is
permitted to be displayed using interactive functions. The particular encoding standards shall conform to the
system speciic IETMDB implementation and the designated presentation system. Non-interactive graphics
shall be viewed in full detail without manipulation. Interactive graphics shall allow the user to either
manipulate the graphic for better view or allow the user to choose selectable areas within the graphic.
3.3.5.2 Minimum size for graphics. Graphics shall be displayed no smaller than required to meet the
minimum displayable size which has been designated for each individual graphic.
3.3.5.3 Graphic density. Graphics shall show only that detail needed to support the action being described.
3.3.5.4 Quality of graphics. Graphics shall be prepared to a scale that ensures legibility of all essential
detail. Line widths shall be of suficient density to register sharply and clearly when displayed at the
designated minimum size EDS.
3.3.5.5 Level of detail in graphics. Graphics shall present only the equipment items referred to by the
action statements, plus suficient surroundings to permit the user to correctly locate the item.
3.3.5.6 Measurements and tolerances. Numerical measurements and tolerances shall be expressed in the
same manner as that required for text (see 3.3.4.6).
3.3.5.7 Textual citations of panel nomenclature. In all references to controls, control positions, test points,
and indicating devices which have panel or chassis nomenclature, the nomenclature used in the textual
label shall be displayed exactly as it appears on the panel or chassis, e.g., all capitals if used, spacing,
and special symbols. Nomenclature shall not be enclosed in quotation marks unless required for clarity.
Functional names shall be used in procedures involving controls and indicators with no panel names. Unless
otherwise speciied by the acquiring activity, all nomenclature used in graphics shall be identical to the
3.3.5.8 Angle of view. Graphics shall be drawn from the same general angle of view that the user sees the
equipment, e.g., during a given step of a procedure. Cutaways and hidden lines shall be used as required in
conjunction with details that are accessible, but not visible, to the user, e.g., as seen after removal of an
access cover or after opening a cabinet door. In situations where the user is able to view the hardware from
more than one angle, the view which provides the most pertinent and necessary information shall be used.
An item or part removed from the system may be rotated to show important features; the axis, direction,
and degrees of rotation shall be indicated in the graphic. Perspective and isometric graphics shall be used
for a more realistic view. Orthographic projection may be used if the view is head on.
3.3.5.9 Use of the human igure. When it is necessary to illustrate an operation or procedure, graphics may
include a human igure or parts of the body. Jewelry shall not appear in any graphics. The human igure
shall not obscure details of the equipment necessary for a complete understanding of its operation. The
human igure shall be clothed as speciied by the acquiring activity (see 6.2k).
3.3.5.10 Types of graphics. Where required to present maintenance procedures or descriptions, an IETM
shall contain graphics to include, but not be limited to, such types as frontispiece (assembled view),
isometric, perspective, and orthogonal.
3.3.5.11 Drawings. When engineering drawings are used as a baseline in the development of graphics, details
which reduce the comprehensibility and clarity of the graphic shall be removed. Electrical and engineering
diagrams shall be laid out functionally. Where information must be presented by means of a signal low
chart or circuit diagram, such visual aids shall be divided into discrete units, simpliied, and standardized.
3.3.5.12 Schematic and wiring diagrams. Unless otherwise speciied by the acquiring activity , wire lists,
schematics, and wiring diagrams initially displayed along with an associated text pane shall be simpliied to
contain only the information referenced by the accompanying text (see 6.2l). The technician shall have
access to the entire wire list, schematic, or wiring diagram when that full graphic is available in the IETM.
3.3.5.13 Functional low diagrams. Functional low diagrams shall be drawn as lowcharts indicating the
direction of system interaction. The information shall low from left-to-right and top-to-bottom on diagrams.
The diagrams shall indicate the detail referenced by the accompanying text.
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