14 C.F.R. § 31.65 Position lights.
Title 14 - Aeronautics and Space
(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° 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 °F: (1) The intensities in the horizontal plane passing through the light unit must equal or exceed the following values: (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. (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]
Title 14: Aeronautics and Space
PART 31—AIRWORTHINESS STANDARDS: MANNED FREE BALLOONS
Subpart D—Design Construction
§ 31.65 Position lights.
------------------------------------------------------------------------ Minimum Position light intensity (candles)------------------------------------------------------------------------Steady white................................................ 20Flashing red or white....................................... 40------------------------------------------------------------------------
------------------------------------------------------------------------ Minimum Angles above and below the horizontal in any vertical plane intensity (degrees) (units)------------------------------------------------------------------------0........................................................... 1.000 to 5...................................................... 0.905 to 10..................................................... 0.8010 to 15.................................................... 0.7015 to 20.................................................... 0.5020 to 30.................................................... 0.3030 to 40.................................................... 0.1040 to 60.................................................... 0.05------------------------------------------------------------------------
