§ 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; 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. 4080, 29 FR 17955, Dec. 18, 1964, amended by Amdt. 23-11, 36 FR 12971, July 10, 1971]