555
Federal Aviation Administration, DOT
§ 27.1411
(b) Externally hung lights may be
used.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–2, 33 FR 964, Jan. 26,
1968]
§ 27.1401
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
the vital areas around the rotorcraft,
considering the physical configuration
and flight characteristics of the rotor-
craft. The field of coverage must ex-
tend in each direction within at least
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 ar-
rangement of the system, that is, the
number of light sources, beam width,
speed of rotation, and other character-
istics, must give an effective flash fre-
quency of not less than 40, nor more
than 100, cycles per minute. The effec-
tive flash frequency is the frequency at
which the rotorcraft’s complete anti-
collision 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 § 27.1397.
(e)
Light intensity.
The minimum
light intensities in any vertical plane,
measured with the red filter (if used)
and expressed in terms of ‘‘effective’’
intensities, must meet the require-
ments of paragraph (f) of this section.
The following relation must be as-
sumed:
I
I t dt
t
t
e
t
t
=
+
−
(
)
∫
( )
.
1
2
0 2
2
1
where:
I
e
= effective intensity (candles).
I(t)
= instantaneous intensity as a function
of time.
t
2
¥
t
1
= flash time interval (seconds).
Normally, the maximum value of effective
intensity is obtained when
t
2
and
t
1
are cho-
sen so that the effective intensity is equal to
the instantaneous intensity at
t
2
and
t
1
.
(f)
Minimum effective intensities for
anticollision light.
Each anticollision
light effective intensity must equal or
exceed the applicable values in the fol-
lowing table:
Angle above or below the horizontal plane
Effective
intensity
(candles)
0
°
to 5
°
................................................................
150
5
°
to 10
°
..............................................................
90
10
°
to 20
°
............................................................
30
20
°
to 30
°
............................................................
15
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–6, 36 FR 12972, July 10,
1971; Amdt. 27–10, 41 FR 5290, Feb. 5, 1976]
S
AFETY
E
QUIPMENT
§ 27.1411
General.
(a) Required safety equipment to be
used by the crew in an emergency, such
as flares and automatic liferaft re-
leases, must be readily accessible.
(b) Stowage provisions for required
safety equipment must be furnished
and must—
(1) Be arranged so that the equip-
ment is directly accessible and its loca-
tion is obvious; and
(2) Protect the safety equipment
from damage caused by being subjected
to the inertia loads specified in § 27.561.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–11, 41 FR 55470, Dec. 20,
1976]
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