Federal Aviation Administration, DOT

Section 29.1401

Section 29.1395 Maximum intensities in overlapping beams of forward and rear
position lights.
No position light intensity may exceed the applicable values in the following table, except as provided in
Section 29.1389(b)(3).
Maximum intensity
Overlaps

Area A
(candles)

Green in dihedral angle L .........
Red in dihedral angle R ............
Green in dihedral angle A .........
Red in dihedral angle A ............
Rear white in dihedral angle L ..
Rear white in dihedral angle R

10
10
5
5
5
5

Area B
(candles)
1
1
1
1
1
1

Where - 
(a) Area A includes all directions in
the adjacent dihedral angle that pass
through the light source and intersect
the common boundary plane at more
than 10 degrees but less than 20 degrees; and
(b) Area B includes all directions in
the adjacent dihedral angle that pass
through the light source and intersect
the common boundary plane at more
than 20 degrees.
Section 29.1397

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 0.440Section0.320y;
x is not greater than ySection0.170; and
y is not less than 0.390Section0.170x.

spaschal on DSK3GDR082PROD with CFR

(c) Aviation white - 
x is not less than 0.300 and not greater than
0.540;
y is not less than xSection0.040 or ycSection0.010,
whichever is the smaller; and
y is not greater than x + 0.020 nor
0.636Section0.400x;
Where Ye is the y coordinate of the Planckian radiator for the value of x considered.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29-7, 36 FR 12972, July 10,
1971]

Section 29.1399 Riding light.
(a) Each riding light required for
water operation must be installed so
that it can - 
(1) Show a white light for at least
two miles at night under clear atmospheric conditions; and
(2) Show a maximum practicable unbroken light with the rotorcraft on the
water.
(b) Externally hung lights may be
used.
Section 29.1401 Anticollision light system.
(a) General. If certification for night
operation is requested, the rotorcraft
must have an anticollision light system that - 
(1) Consists of one or more approved
anticollision lights located so that
their emitted light will not impair the
crew-s vision or detract from the conspicuity of the position lights; and
(2) Meets the requirements of paragraphs (b) through (f) of this section.
(b) Field of coverage. The system must
consist of enough lights to illuminate
the vital areas around the rotorcraft,
considering the physical configuration
and flight characteristics of the rotorcraft. The field of coverage must extend in each direction within at least
30 degrees above and 30 degrees below
the horizontal plane of the rotorcraft,
except that there may be solid angles
of obstructed visibility totaling not
more than 0.5 steradians.
(c) Flashing characteristics. The arrangement of the system, that is, the
number of light sources, beam width,
speed of rotation, and other characteristics, must give an effective flash frequency of not less than 40, nor more
than 100, cycles per minute. The effective flash frequency is the frequency at
which the rotorcraft-s complete anticollision light system is observed from
a distance, and applies to each sector
of light including any overlaps that
exist when the system consists of more
than one light source. In overlaps,
flash frequencies may exceed 100, but
not 180, cycles per minute.
(d) Color. Each anticollision light
must be aviation red and must meet
the applicable requirements of Section 29.1397.
(e) Light intensity. The minimum
light intensities in any vertical plane,
measured with the red filter (if used)

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