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; andz 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; andy 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 y0-0.010, whichever is the
smaller; andy is not greater than x+0.020 nor 0.636-0.400x;Where y0 is the y coordinate of the Planckian radiator for the value of x considered. [Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-27, 36 FR 12972, July 10, 1971]