MIL-DTL-24784 / 21B (SH)
d.
Lettering. Lettering shall be accomplished in the following manner:
1.
All lettering on the diagrams shall be Letter Gothic. Letter style shall be vertical,
uppercase Gothic (sans-serif) as illustrated by figure 21-16.
2.
Lowercase lettering shall not be used for general lettering on a diagram. Lowercase
letters shall be indicated as an underscored uppercase letter but may be used when:
a) Lower case lettering appears on the physical part (such as connector pins).
b) Symbols requiring lowercase letters are used on drawings.
c) Signal names contain lowercase letters such as an abbreviation like "Db".
3.
All lettering shall be placed on the diagrams in a position readable from either the bottom
or right-hand side of the diagram.
4.
Letter size, line spacing, and line weight shall be as follows:
a)
8-point for drawing sheet number, title block, main drawing number block, circled
keyed text reference number, hardware boundary titles, and functional boundary
titles. Line spacing for 8-point type shall be 2 points (.028 inches) minimum.
b) 7-point for all other format block areas and the field of the drawing. Line spacing
for 7-point shall be 2 points (.028 inches) minimum.
e.
Notes. Notes shall be included on the diagrams as appropriate. The notes shall be identified
by Arabic numerals in consecutive numeric sequence starting with the number 1.
3.5.1.2 Flowchart development. Flowchart shall be developed using the following procedure
and symbology, and the symbols of ISO 6829:
a. General flow. The general flow of the flowchart shall be top-to-bottom and left-to-right. A
portion of the flow may be contrary to the general flow if no intermediate blocks are involved
(see figure 21-17).
b. Terminal blocks (see figure 21-18). These blocks are used to show the starting and ending
points of a flow. START blocks shall have a vertical exiting line. EXIT and COMPLETE
blocks shall have vertical or horizontal entry lines. The EXIT block shall be accompanied by
text explaining the reason for the EXIT.
c. Annotation or comment block. These blocks are used to provide additional descriptive
clarification, comments, or explanatory notes (see figure 21-19). The dashed line is connected
to the dashed outline of the symbol corresponding to the data contained inside. This block is
inserted with the dashed line intersecting flowchart flow at the point appropriate to the
content of the block.
d. Process blocks. These blocks define an operation to be performed (see figure 21-20). These
blocks shall have only one entry line and one exiting line. Entry lines and exiting lines shall be
vertical or horizontal; however, entry lines shall never enter the bottom of a process block and
exiting lines shall never leave the top of a process block. Process blocks shall never be used in
place of decision blocks.
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