§ 27.1397. Color specifications.
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/us/cfr/t14/s§ 27.1397·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
Each position light color must have the applicable International Commission on Illumination chromaticity coordinates as follows:
(a)Aviation red— y is not greater than 0.335; and z is not greater than 0.002.
(b)Aviation green— x is not greater than 0.440−0.320y; x is not greater than y−0.170; and y is not less than 0.390−0.170x.
(c)Aviation white— x is not less than 0.300 and not greater than 0.540; y is not less than x−0.040” or yc−0.010, whichever is the smaller; and y is not greater than x + 0.020 nor 0.636−0.400x; Where yc is the y coordinate of the Planckian radiator for the value of x considered. [Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-6, 36 FR 12972, July 10, 1971]