813
Federal Aviation Administration, DOT
§ 29.1397
(the plane containing the longitudinal
axis of the rotorcraft and perpendicular
to the plane of symmetry of the rotor-
craft), must equal or exceed the values
in § 29.1391.
(2)
Intensities in any vertical plane.
Each intensity in any vertical plane
(the plane perpendicular to the hori-
zontal plane) must equal or exceed the
appropriate value in § 29.1393 where
I is
the minimum intensity prescribed in
§ 29.1391 for the corresponding angles in
the horizontal plane.
(3)
Intensities in overlaps between adja-
cent signals. No intensity in any over-
lap between adjacent signals may ex-
ceed the values in § 29.1395, except that
higher intensities in overlaps may be
used with the use of main beam inten-
sities substantially greater than the
minima specified in §§ 29.1391 and
29.1393 if the overlap intensities in rela-
tion to the main beam intensities do
not adversely affect signal clarity.
§ 29.1391
Minimum intensities in the
horizontal plane of forward and
rear position lights.
Each position light intensity must
equal or exceed the applicable values in
the following table:
Dihedral angle (light in-
cluded)
Angle from right or left
of longitudinal axis,
measured from dead
ahead
Intensity
(candles)
L and R (forward red
and green).
0
°
to 10
°
.....................
10
°
to 20
°
...................
20
°
to 110
°
.................
40
30
5
A (rear white) ..............
110
°
to 180
°
...............
20
§ 29.1393
Minimum intensities in any
vertical plane of forward and rear
position lights.
Each position light intensity must
equal or exceed the applicable values in
the following table:
Angle above or below the horizontal plane
Intensity, I
0
°
.........................................................................
1.00
0
°
to 5
°
................................................................
.90
5
°
to 10
°
..............................................................
.80
10
°
to 15
°
............................................................
.70
15
°
to 20
°
............................................................
.50
20
°
to 30
°
............................................................
.30
30
°
to 40
°
............................................................
.10
40
°
to 90
°
............................................................
.05
§ 29.1395
Maximum intensities in over-
lapping beams of forward and rear
position lights.
No position light intensity may ex-
ceed the applicable values in the fol-
lowing table, except as provided in
§ 29.1389(b)(3).
Overlaps
Maximum intensity
Area A
(candles)
Area B
(candles)
Green in dihedral angle L .........
10 1
Red in dihedral angle R ............
10 1
Green in dihedral angle A .........
5 1
Red in dihedral angle A ............
5 1
Rear white in dihedral angle L ..
5 1
Rear white in dihedral angle R
5 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 de-
grees; 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.
§ 29.1397
Color specifications.
Each position light color must have
the applicable International Commis-
sion on Illumination chromaticity co-
ordinates 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¥0.320y;
x is not greater than y¥0.170; and
y is not less than 0.390¥0.170x.
(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
c
¥0.010,
whichever is the smaller; and
y
is not greater than
x+0.020 nor
0.636¥0.400
x;
Where
Y
e
is the
y coordinate of the Planck-
ian 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]
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