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]