title-14-part-27-sec27-777

520

14 CFR Ch. I (1–1–24 Edition)

§ 27.755

(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.

ERSONNEL AND

ARGO

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

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
paragraph (a) of this section must be
shown by ground or night flight tests.

parent display surface located in the

pilot’s outside field of view, such as a
head up-display, head mounted display,
or other equivalent display, must meet
the following requirements:

(1) While the vision system display is

in operation, it must compensate for
interference with the pilot’s outside
field of view such that the combination
of what is visible in the display and
what remains visible through and
around it, allows the pilot compart-
ment to satisfy the requirements of
paragraphs (a)(1) and (b) of this sec-
tion.

(2) The pilot’s view of the external

scene may not be distorted by the
transparent display surface or by the
vision system imagery. When the vi-
sion system displays imagery or any
symbology that is referenced to the im-
agery and outside scene topography,
including attitude symbology, flight
path vector, and flight path angle ref-
erence cue, that imagery and sym-
bology must be aligned with, and
scaled to, the external scene.

(3) The vision system must provide a

means to allow the pilot using the dis-
play to immediately deactivate and re-
activate the vision system imagery, on
demand, without removing the pilot’s
hands from the primary flight and
power controls, or their equivalent.

(4) When the vision system is not in

operation it must permit the pilot
compartment to satisfy the require-
ments of paragraphs (a)(1) and (b) of
this section.

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Docket FAA–2013–0485, Amdt. 27–
48, 81 FR 90170, Dec. 13, 2016; Docket FAA–
2016–9275, Amdt. 27–50, 83 FR 9423, Mar. 6,
2018]

§ 27.775

Windshields and windows.

Windshields and windows must be

made of material that will not break
into dangerous fragments.

[Amdt. 27–27, 55 FR 38966, Sept. 21, 1990]

§ 27.777

Cockpit controls.

Cockpit controls must be—
(a) Located to provide convenient op-

eration and to prevent confusion and
inadvertent operation; and

(b) Located and arranged with re-

spect to the pilots’ seats so that there
is full and unrestricted movement of
each control without interference from

VerDate Sep<11>2014

09:06 Jun 28, 2024

Jkt 262046

PO 00000

Frm 00530

Fmt 8010

Sfmt 8010

Y:\SGML\262046.XXX

262046

jspears on DSK121TN23PROD with CFR

521

Federal Aviation Administration, DOT

§ 27.785

the cockpit structure or the pilot’s
clothing when pilots from 5

′

″

to 6

′

″

height are seated.

§ 27.779

Motion and effect of cockpit

controls.

Cockpit controls must be designed so

that they operate in accordance with
the following movements and actu-
ation:

(a) Flight controls, including the col-

lective pitch control, must operate
with a sense of motion which cor-
responds to the effect on the rotor-
craft.

(b) Twist-grip engine power controls

must be designed so that, for lefthand
operation, the motion of the pilot’s
hand is clockwise to increase power
when the hand is viewed from the edge
containing the index finger. Other en-
gine power controls, excluding the col-
lective control, must operate with a
forward motion to increase power.

must operate downward to extend the
landing gear.

[Amdt. 27–21, 49 FR 44434, Nov. 6, 1984]

§ 27.783

Doors.

(a) Each closed cabin must have at

least one adequate and easily acces-
sible external door.

(b) Each external door must be lo-

cated where persons using it will not be
endangered by the rotors, propellers,
engine intakes, and exhausts when ap-
propriate operating procedures are
used. If opening procedures are re-
quired, they must be marked inside, on
or adjacent to the door opening device.

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–26, 55 FR 8001, Mar. 6,
1990]

§ 27.785

Seats, berths, litters, safety

belts, and harnesses.

(a) Each seat, safety belt, harness,

and adjacent part of the rotorcraft at
each station designated for occupancy
during takeoff and landing must be free
of potentially injurious objects, sharp
edges, protuberances, and hard surfaces
and must be designed so that a person
making proper use of these facilities
will not suffer serious injury in an
emergency landing as a result of the
static inertial load factors specified in

§ 27.561(b) and dynamic conditions spec-
ified in § 27.562.

(b) Each occupant must be protected

from serious head injury by a safety
belt plus a shoulder harness that will
prevent the head from contacting any
injurious object except as provided for
in § 27.562(c)(5). A shoulder harness
(upper torso restraint), in combination
with the safety belt, constitutes a
torso restraint system as described in
TSO-C114.

combined safety belt and shoulder har-
ness with a single-point release. Each
pilot’s combined safety belt and shoul-
der harness must allow each pilot when
seated with safety belt and shoulder
harness fastened to perform all func-
tions necessary for flight operations.
There must be a means to secure belts
and harnesses, when not in use, to pre-
vent interference with the operation of
the rotorcraft and with rapid egress in
an emergency.

(d) If seat backs do not have a firm

handhold, there must be hand grips or
rails along each aisle to enable the oc-
cupants to steady themselves while
using the aisle in moderately rough
air.

(e) Each projecting object that could

injure persons seated or moving about
in the rotorcraft in normal flight must
be padded.

(f) Each seat and its supporting

structure must be designed for an occu-
pant weight of at least 170 pounds con-
sidering the maximum load factors, in-
ertial forces, and reactions between oc-
cupant, seat, and safety belt or harness
corresponding with the applicable
flight and ground load conditions, in-
cluding the emergency landing condi-
tions of § 27.561(b). In addition—

(1) Each pilot seat must be designed

for the reactions resulting from the ap-
plication of the pilot forces prescribed
in § 27.397; and

(2) The inertial forces prescribed in

§ 27.561(b) must be multiplied by a fac-
tor of 1.33 in determining the strength
of the attachment of—

(i) Each seat to the structure; and
(ii) Each safety belt or harness to the

seat or structure.

(g) When the safety belt and shoulder

harness are combined, the rated
strength of the safety belt and shoulder