Title 14 - Aeronautics and Space

Volume: 1Date: 2024-01-01Original Date: 2024-01-01Title: Section 25.1397 - Color specifications.Context:
Title 14 - Aeronautics and Space. CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION. SUBCHAPTER C - AIRCRAFT. PART 25 - AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES. Subpart F - Equipment. - Lights.

§ 25.1397
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. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-27, 36 FR 12972, July 10, 1971]