Sec. 27.1397 - 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 0.440−0.320y;

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 yc−0.010, whichever is the smaller; and

y is not greater than x+0.020 nor 0.636−0.400x;

Where yc is the y coordinate of the Planckian radiator for the value of x considered.
 

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-6, 36 FR 12972, July 10, 1971]