Color specifications.

§ 25.1397 Color specifications. 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 0.440−0.320 y ; x is not greater than y −0.170; and y is not less than 0.390−0.170 x . (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 y 0 −0.010, whichever is the smaller; and y is not greater than x + 0.020 nor 0.636−0.400 x ; Where y 0 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]