668
14 CFR Ch. I (1–1–14 Edition)
§ 27.735
in service, have a clearance to sur-
rounding structure and systems that is
adequate to prevent contact between
the tire and any part of the structure
or systems.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–11, 41 FR 55469, Dec. 20,
1976]
§ 27.735
Brakes.
For rotorcraft with wheel-type land-
ing gear, a braking device must be in-
stalled that is—
(a) Controllable by the pilot;
(b) Usable during power-off landings;
and
(c) Adequate to—
(1) Counteract any normal unbal-
anced torque when starting or stopping
the rotor; and
(2) Hold the rotorcraft parked on a
10-degree slope on a dry, smooth pave-
ment.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–21, 49 FR 44434, Nov. 6,
1984]
§ 27.737
Skis.
The maximum limit load rating of
each ski must equal or exceed the max-
imum limit load determined under the
applicable ground load requirements of
this part.
F
LOATS AND
H
ULLS
§ 27.751
Main float buoyancy.
(a) For main floats, the buoyancy
necessary to support the maximum
weight of the rotorcraft in fresh water
must be exceeded by—
(1) 50 percent, for single floats; and
(2) 60 percent, for multiple floats.
(b) Each main float must have
enough water-tight compartments so
that, with any single main float com-
partment flooded, the main floats will
provide a margin of positive stability
great enough to minimize the prob-
ability of capsizing.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–2, 33 FR 963, Jan. 26,
1968]
§ 27.753
Main float design.
(a)
Bag floats. Each bag float must be
designed to withstand—
(1) The maximum pressure differen-
tial that might be developed at the
maximum altitude for which certifi-
cation with that float is requested; and
(2) The vertical loads prescribed in
§ 27.521(a), distributed along the length
of the bag over three-quarters of its
projected area.
(b)
Rigid floats. Each rigid float must
be able to withstand the vertical, hori-
zontal, and side loads prescribed in
§ 27.521. These loads may be distributed
along the length of the float.
§ 27.755
Hulls.
For each rotorcraft, with a hull and
auxiliary floats, that is to be approved
for both taking off from and landing on
water, the hull and auxiliary floats
must have enough watertight compart-
ments so that, with any single com-
partment flooded, the buoyancy of the
hull and auxiliary floats (and wheel
tires if used) provides a margin of posi-
tive stability great enough to minimize
the probability of capsizing.
P
ERSONNEL AND
C
ARGO
A
CCOMMODATIONS
§ 27.771
Pilot compartment.
For each pilot compartment—
(a) The compartment and its equip-
ment must allow each pilot to perform
his duties without unreasonable con-
centration or fatigue;
(b) If there is provision for a second
pilot, the rotorcraft must be control-
lable with equal safety from either
pilot seat; and
(c) The vibration and noise charac-
teristics of cockpit appurtenances may
not interfere with safe operation.
§ 27.773
Pilot compartment view.
(a) Each pilot compartment must be
free from glare and reflections that
could interfere with the pilot’s view,
and designed so that—
(1) Each pilot’s view is sufficiently
extensive, clear, and undistorted for
safe operation; and
(2) Each pilot is protected from the
elements so that moderate rain condi-
tions do not unduly impair his view of
the flight path in normal flight and
while landing.
(b) If certification for night oper-
ation is requested, compliance with
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