Specifications
MIL-STD-1472E
5.2.2.1.5 Grouping.
Master caution, master warning, master advisory and summation lights
used to indicate the condition of an entire subsystem shall be set apart from the lights which show the
status of the subsystem components, except as rquid by 5.2,2.1.8.
5.2.2.1.6 Location. When a transilluminated indicator is associated with a control, the indicator
light shall be located so that it can be associated with the control without emor and shall be visible to
the operator during control operation.
5.2.2.1.7 Location, critical functions. For critical functions, indicators shall be located within
15° of the operator’s normal line of sight (see Figure 2). Warning lights shall be an integral part of, or
located adjacent to, the lever, switch, or other control by which the operator is to take action.
5.2.2.1.8 Maintenance dhmlays. indicator lights used solely for maintenance and adjustment
shall be covered or non-visible during normal equipment operation, but shall be readily accessible
when required.
5.2.2.1.9 Lum@mx. The luminance of &anSill “
unmated displays sMI be compatible with the
expected ambient illumimmce,
and shall be not less than 10% greater than the sumounding luminance.
Where glare must be reduced, the hrninance of transill “
unmated displays should be not more than
300% of the sumound.ingluminance.
5.2.2.1.10 Luminance control. When displays will be used under varied ambient illuminance, a
dimming control shall be provided. The range of the control shall permit the displays to be kgible
under all expected ambient illumimmce.
The control shall be capable of providing multiple step or
continuously variable illumination. Dimming to full OFF may be provided in non+xiticaJ opemtions,
buttiti&ti tiM~tfduw~ onati_mtild tiffl@_rfd~s,
i.e., failure to detector perform a critical step in an operation.
5.2.2,1.11 False indication or obscuration, Director reflected light shall not make indicatom
appear illuminated when they are not, or appear extinguished when they are illuminated. self-reflection
shall be minhizd
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“ Ofbdisplqwithmqmctto lheobaemr.
5.2.2.1.12 ~trast
. . . .
lthtn b mcllcator
The lumimmce
contrast (See MIL-HDBK- 1908)
within the indicator shaU bwnot less than 2.0. “Thisrquimment does not apply to special displays
spczificaliy designed for kgibility in sunlight. For low ambient illumination applications, this ratio
should be not less than 9.0, with the background luminance less than the figure luminance.
5.2.2.1.13 Lam nxhudancy. Incandescent light sourws shall use dual lamps or lamps with
two fihtrnents. When one fiknent or btdb faik, t.iwintensity of the @t Sh~ decreuse 9ttff_iCtiy to
indicate the need for lamp replacement, but not so much as to degrade operator performance.
5.2.2.1.14 hwtuting
Wlm indicator Aigbtsusing
uandmemt bulbs aminstakdona
control panel, a master light tesi control shall be incorporated. When appropriate, the capability to
simultaneously test all control panels may be provided. Pan+
COmining three or * lights may
incqomte individual pruss-to+est bulb testing, The total indkator circuit should be capable of being
testd. KdarkAa@a&imis a factar, a mans fot reduc~ total indiw ijght brightness duriqg test
operation shall be provided,
~ > > 115
.. -<-. LUrnDl’e!wwd, methd. Whtwe fw!+swe, - A&!i b twwwkie A twpkwldc
from the front of the
clis kiv panel. The proccdum. for knp removal and repkement shall not require
f
the use of tools and sha 1be easily and rapidly accomplished.
5.2.2.1.1 G LamP removal, safety. Display circuit design shall pennil lamp removal and
It~pl~lrenten(whIk power is applied withw causing Iailure of indicator circuit components {N