1.3.1 Aviation Colors

Aviation colors available include Green, Red, Blue, White, Yellow (Amber), and Cyan as described in Figure 1.3.1-A.

Figure 1.3.1-A Chromaticity Coordinates
1/ Chromaticity is expressed as x and y on the CIE chromaticity diagram.
Values shown are corners of the limiting envelope
2/ SL - Spectrum Locus (where intersected by other coordinate).
Color x 1/ y 1/
Blue .100
.180
.180
.100		 .145
.145
.250
.250
Green .300
.300
.380
.380		 SL 2/
.600
.600
SL 2/
White .330
.350
.400
.400
.380
.330		 .330
.330
.380
.420
.420
.370
Yellow
(Amber)		 .562
.570
.596
.605		 .415
SL 2/
.382
SL 2/
Red .695
.710
.655
.660		 .285
SL 2/
.352
SL 2/
Cyan .230
.230
.320
.320		 .350
.420
.420
.350
Sunlight Readability - Aviation (Display Type S)

Type S displays are sunlight readable and meet the contrast ratio requirements of MIL-PRF-22885 with an opaque black background containing indiscernible legends until illuminated. When energized at rated voltage, the display legends are readable in 10,000 footcandles of direct sunlight including any glare producing angle up to 15° and 30° to the normal of the viewing surface. When the display is not energized the legends are hidden and cannot be read in direct sunlight. The display contrast values meet or exceed the minimum contrast requirements of MIL-PRF-22885.

The minimum contrast values for each color at full rated voltage are shown below.

Figure 1.3.1-B Minimum Contrast Ratios
Color Contrast @ 15° Contrast @ 30°
Blue 0.60 0.30
Green 0.60 0.30
White 0.60 0.40
Yellow (Amber) 0.60 0.40
Red 0.60 0.30
Cyan 0.40 0.20

See Appendix D for information about the luminance of other cap voltage options.