CFR /  Title 14  /  Part 23  /  Sec. 23.1397 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; 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. 4080, 29 FR 17955, Dec. 18, 1964, amended by Amdt. 23-11, 36 FR 12971, July 10, 1971]