GM1
ADR-DSN.U.930 Colours for aeronautical ground lights
ED Decision 2017/021/R
(a) The chromaticity for ground lights with filament-type light sources, where dimming is not required, or where observers with defective colour vision should be able to determine the colour of the light, green signals should be within the following boundaries:
Yellow boundary y = 0.726 – 0.726x
White boundary x = 0.650y
Blue boundary y = 0.390 – 0.171x
(b) Guidance on chromaticity changes resulting from the effect of temperature on filtering elements is given in ICAO Doc 9157, Aerodrome Design Manual, Part 4, Visual Aids.
(c) Where the colour signal is to be seen from long range, the current practice is to use colours within the boundaries specified in paragraph (a) above.
(d) For the chromaticity of ground lights with solid-state light sources, where observers with defective colour vision should be able to determine the colour of the light, green signals should be within the following boundaries:
Yellow boundary y = 0.726 – 0.726x
White boundary x = 0.625y – 0.041
Blue boundary y = 0.400
(e) For the chromaticity of ground lights having a solid state light source, in order to avoid a large variation of shades of green, and if colours within the boundaries below are selected, colours within the boundaries specified in paragraph (d) above should not be used:
Yellow boundary x= 0.310
White boundary x = 0.625y – 0.041
Blue boundary y = 0.726 – 0.726x
(f) Colour measurement for filament-type and solid state-type light sources:
(1) for the outermost isocandela curve, a measurement of colour coordinates should be made and recorded for review and judgement of acceptability; and
(2) certain light units may have an application so that they may be viewed and used by pilots from directions beyond that of the outermost isocandela curve (e.g. stop bar lights at significantly wide runway-holding positions); then an assessment of the actual application should be conducted and, if necessary, a check of colour shift at angular ranges beyond the outermost curve carried out.
[Issue: ADR-DSN/3]
[Issue: ADR-DSN/4]
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