310
14 CFR Ch. I (1–1–14 Edition)
§ 23.1381
(d) Labeled as to operation and the
circuit controlled.
L
IGHTS
§ 23.1381
Instrument lights.
The instrument lights must—
(a) Make each instrument and con-
trol easily readable and discernible;
(b) Be installed so that their direct
rays, and rays reflected from the wind-
shield or other surface, are shielded
from the pilot’s eyes; and
(c) Have enough distance or insu-
lating material between current car-
rying parts and the housing so that vi-
bration in flight will not cause short-
ing.
A cabin dome light is not an instru-
ment light.
§ 23.1383
Taxi and landing lights.
Each taxi and landing light must be
designed and installed so that:
(a) No dangerous glare is visible to
the pilots.
(b) The pilot is not seriously affected
by halation.
(c) It provides enough light for night
operations.
(d) It does not cause a fire hazard in
any configuration.
[Doc. No. 27806, 61 FR 5169, Feb. 9, 1996]
§ 23.1385
Position light system installa-
tion.
(a)
General. Each part of each posi-
tion light system must meet the appli-
cable requirements of this section and
each system as a whole must meet the
requirements of §§ 23.1387 through
23.1397.
(b)
Left and right position lights. Left
and right position lights must consist
of a red and a green light spaced lat-
erally as far apart as practicable and
installed on the airplane such that,
with the airplane in the normal flying
position, the red light is on the left
side and the green light is on the right
side.
(c)
Rear position light. The rear posi-
tion light must be a white light mount-
ed as far aft as practicable on the tail
or on each wing tip.
(d)
Light covers and color filters. Each
light cover or color filter must be at
least flame resistant and may not
change color or shape or lose any ap-
preciable light transmission during
normal use.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as
amended by Amdt. 23–17, 41 FR 55465, Dec. 20,
1976; Amdt. 23–43, 58 FR 18977, Apr. 9, 1993]
§ 23.1387
Position light system dihe-
dral angles.
(a) Except as provided in paragraph
(e) of this section, each position light
must, as installed, show unbroken light
within the dihedral angles described in
this section.
(b) Dihedral angle
L (left) is formed
by two intersecting vertical planes, the
first parallel to the longitudinal axis of
the airplane, and the other at 110 de-
grees to the left of the first, as viewed
when looking forward along the longi-
tudinal axis.
(c) Dihedral angle
R (right) is formed
by two intersecting vertical planes, the
first parallel to the longitudinal axis of
the airplane, and the other at 110 de-
grees to the right of the first, as viewed
when looking forward along the longi-
tudinal axis.
(d) Dihedral angle
A (aft) is formed
by two intersecting vertical planes
making angles of 70 degrees to the
right and to the left, respectively, to a
vertical plane passing through the lon-
gitudinal axis, as viewed when looking
aft along the longitudinal axis.
(e) If the rear position light, when
mounted as far aft as practicable in ac-
cordance with § 23.1385(c), cannot show
unbroken light within dihedral angle A
(as defined in paragraph (d) of this sec-
tion), a solid angle or angles of ob-
structed visibility totaling not more
than 0.04 steradians is allowable within
that dihedral angle, if such solid angle
is within a cone whose apex is at the
rear position light and whose elements
make an angle of 30
°
with a vertical
line passing through the rear position
light.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30
FR 258, Jan. 9, 1965, as amended by Amdt. 23–
12, 36 FR 21278, Nov. 5, 1971; Amdt. 23–43, 58
FR 18977, Apr. 9, 1993]
§ 23.1389
Position light distribution
and intensities.
(a)
General. The intensities prescribed
in this section must be provided by new
equipment with each light cover and
color filter in place. Intensities must
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