[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR31.65]
[Page 756]
TITLE 14--AERONAUTICS AND SPACE
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
PART 31--AIRWORTHINESS STANDARDS: MANNED FREE BALLOONS--Table of Contents
Subpart D--Design Construction
Sec. 31.65 Position lights.
(a) If position lights are installed, there must be one steady
aviation white position light and one flashing aviation red (or flashing
aviation white) position light with an effective flash frequency of at
least 40, but not more than 100, cycles per minute.
(b) Each light must provide 360 deg. horizontal coverage at the
intensities prescribed in this paragraph. The following light
intensities must be determined with the light source operating at a
steady state and with all light covers and color filters in place and at
the manufacturer's rated mimimum voltage. For the flashing aviation red
light, the measured values must be adjusted to correspond to a red
filter temperature of at least 130 deg.F:
(1) The intensities in the horizontal plane passing through the
light unit must equal or exceed the following values:
------------------------------------------------------------------------
Minimum
Position light intensity
(candles)
------------------------------------------------------------------------
Steady white................................................ 20
Flashing red or white....................................... 40
------------------------------------------------------------------------
(2) The intensities in vertical planes must equal or exceed the
following values. An intensity of one unit corresponds to the applicable
horizontal plane intensity specified in paragraph (b)(1) of this
section.
------------------------------------------------------------------------
Minimum
Angles above and below the horizontal in any vertical plane intensity
(degrees) (units)
------------------------------------------------------------------------
0........................................................... 1.00
0 to 5...................................................... 0.90
5 to 10..................................................... 0.80
10 to 15.................................................... 0.70
15 to 20.................................................... 0.50
20 to 30.................................................... 0.30
30 to 40.................................................... 0.10
40 to 60.................................................... 0.05
------------------------------------------------------------------------
(c) The steady white light must be located not more than 20 feet
below the basket, trapeze, or other means for carrying occupants. The
flashing red or white light must be located not less than 7, nor more
than 10, feet below the steady white light.
(d) There must be a means to retract and store the lights.
(e) Each position light color must have the applicable International
Commission on Illumination chromaticity coordinates as follows:
(1) Aviation red--
y is not greater than 0.335; and z is not greater than 0.002.
(2) Aviation white--
x is not less than 0.300 and not greater than 0.540;
y is not less than x-0.040 or yo-0.010, whichever is the
smaller; and
y is not greater than x+0.020 nor 0.636-0.0400 x;
Where yo is the y coordinate of the Planckian radiator for
the value of x considered.
[Doc. No. 1437, 29 FR 8258, July 1, 1964, as amended by Amdt. 31-1, 29
FR 14563, Oct. 24, 1964; Amdt. 31-4, 45 FR 60179, Sept. 11, 1980]