Specifications

MIL-STI.)-!472E
5.2.1.4.13 Aircrew station simmls, Important or frequently used pilot or co-pilot station
displays shall be placed in the prime visual signal area (PVSA) (see MIL-HDBK-1908)or otherwise
highlighted. If a large number of important and frequently used displays exists, important displays
shall be the higher priority for placement in the PVSA. Criteria appearing ekwhere in this section do
not apply to pilot and co-pilot stations (see 5.14.2.1); however, human engineering design for other
members of thecrew who occupy positions in the air vehicle other than on the fight
deck(such as in
multi-engined specialized aircraft) shall be in accordance with the criteria herein.
5.2.1.5 Coding.
5.2,1 .5.1 Objectives. Coding shall be used to facilitate discriminating between individual
displays, identifying functionally related displays, recognizing the relationship between displays, and
identi~ing critical information within a display, and to preserve conventional practices and
arrangements for warning and alerting systems.
5.2.1 .5.2 Techniques. Displays shall be coded by color, size, Ioeation, shape, or flash, as
applicable.
5.2.1.5.3 $tandardizuion. All coding within the system shall be uniform and shall be
established by agreement with the procuring activity.
5.2.1 .5.4 Mcrew Display Svmbolo~y.
SymboIogy for Aircrew displays shall be in accordance
with MIL-STD-1787.
5.2.2 Transiliuminated disdavs.
5.2.2.1 General General types of tramilluminated displays that may be used include:
a. single- and multiple-legend lights that present information as words, numbers, symbols, and
abbreviations,
b, simple indicator lights, and
c. transiihuninated panel assemblies thatpresent qualitative status or system readiness
information.
5.2.2.1.1 ~. TransiIluminated displays should be used to provide qualitative information to
the operator requiring either an immediate reaction by the operator, or to draw attention to an important
system status. Such displays may also be used occasionally for maintenance and adjustment
functions,
5.2.2.1.2 Euuioment res
wnse. Lights, including those used in illuminated push buttons, shall
display equipment response and not merely control position.
5.2.2. !.3 lnfcmnmrcm. Lights and rchsted m&atOrs
shall be Ud q.mingiy and skdi &@&y
only that infbrrnation necesstuy for effective system operation.
5.2.2.1.4 Positive feedback. Changes in display status shall signify changes in functional status
rather thanmtrkwof eont?miaottmtmnuicme. Theoimemm orioe@ofasi&ud orv&wd~
Adi
not be used 10denote a “malfunction,” “no-go,” or “out-of-tolerance” condition; however, the absence
of a “power on” signal or visual indication may be used to indicate a “power off’ condition for
operational displays, but not for rnamtenancc displays. the absence or loss ot a sIgnd or visual
indication MU m h WCC!to Mime n “mvh’”
nr “in ttn!rr~nry”f-nrf~ifionIInlesstheS(nttl<or
.
~il(]ti~n light filamenl and it$msociated circuitry can hc easily tested by the operator and operator
~~,!l!~;>t;lJII,)(.II(’htJ\Jf.I\Isii n(lf Iim(> critic;ll
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