665 

Federal Aviation Administration, DOT 

§ 29.1401 

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

¥

0.320

y; 

x is not greater than y

¥

0.170; and 

y is not less than 0.390

¥

0.170

x. 

(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] 

§ 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 atmos-
pheric conditions; and 

(2) Show a maximum practicable un-

broken light with the rotorcraft on the 
water. 

(b) Externally hung lights may be 

used. 

§ 29.1401

Anticollision light system. 

(a) 

General.  If certification for night 

operation is requested, the rotorcraft 
must have an anticollision light sys-
tem 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 con-
spicuity of the position lights; and 

(2) Meets the requirements of para-

graphs (b) through (f) of this section. 

(b) 

Field of coverage. The system must 

consist of enough lights to illuminate 

VerDate Sep<11>2014 

09:06 Jun 28, 2024

Jkt 262046

PO 00000

Frm 00675

Fmt 8010

Sfmt 8010

Y:\SGML\262046.XXX

262046

jspears on DSK121TN23PROD with CFR