14 C.F.R. § 23.1397 Color specifications.
Title 14 - Aeronautics and Space
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 y0−0.010, whichever is the smaller; and y 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]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart F—Equipment
Lights
§ 23.1397 Color specifications.