C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES › Subpart F—Equipment

14 C.F.R. § 25.1397

Color specifications

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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. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-27, 36 FR 12972, July 10, 1971]