title-14-part-29-sec29-1165

649

Federal Aviation Administration, DOT

§ 29.1165

§ 29.1147

Mixture controls.

(a) If there are mixture controls,

each engine must have a separate con-
trol, and the controls must be arranged
to allow—

(1) Separate control of each engine;

and

(2) Simultaneous control of all en-

gines.

(b) Each intermediate position of the

mixture controls that corresponds to a
normal operating setting must be iden-
tifiable by feel and sight.

§ 29.1151

Rotor brake controls.

(a) It must be impossible to apply the

rotor brake inadvertently in flight.

(b) There must be means to warn the

crew if the rotor brake has not been
completely released before takeoff.

§ 29.1157

Carburetor air temperature

controls.

There must be a separate carburetor

air temperature control for each en-
gine.

§ 29.1159

Supercharger controls.

Each supercharger control must be

accessible to—

(a) The pilots; or
(b) (If there is a separate flight engi-

neer station with a control panel) the
flight engineer.

§ 29.1163

Powerplant accessories.

(a) Each engine mounted accessory

must—

(1) Be approved for mounting on the

engine involved;

(2) Use the provisions on the engine

for mounting; and

(3) Be sealed in such a way as to pre-

vent contamination of the engine oil
system and the accessory system.

(b) Electrical equipment subject to

arcing or sparking must be installed,
to minimize the probability of igniting
flammable fluids or vapors.

driven cabin supercharger or any re-
mote accessory driven by the engine
will be a hazard if they malfunction,
there must be means to prevent their
hazardous rotation without interfering
with the continued operation of the en-
gine.

(d) Unless other means are provided,

torque limiting means must be pro-

vided for accessory drives located on
any component of the transmission and
rotor drive system to prevent damage
to these components from excessive ac-
cessory load.

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–22, 49 FR 6850, Feb. 23,
1984; Amdt. 29–26, 53 FR 34219, Sept. 2, 1988]

§ 29.1165

Engine ignition systems.

(a) Each battery ignition system

must be supplemented with a generator
that is automatically available as an
alternate source of electrical energy to
allow continued engine operation if
any battery becomes depleted.

(b) The capacity of batteries and gen-

erators must be large enough to meet
the simultaneous demands of the en-
gine ignition system and the greatest
demands of any electrical system com-
ponents that draw from the same
source.

system must account for—

(1) The condition of an inoperative

generator;

(2) The condition of a completely de-

pleted battery with the generator run-
ning at its normal operating speed; and

(3) The condition of a completely de-

pleted battery with the generator oper-
ating at idling speed, if there is only
one battery.

(d) Magneto ground wiring (for sepa-

rate ignition circuits) that lies on the
engine side of any firewall must be in-
stalled, located, or protected, to mini-
mize the probability of the simulta-
neous failure of two or more wires as a
result of mechanical damage, electrical
fault, or other cause.

(e) No ground wire for any engine

may be routed through a fire zone of
another engine unless each part of that
wire within that zone is fireproof.

(f) Each ignition system must be

independent of any electrical circuit
that is not used for assisting, control-
ling, or analyzing the operation of that
system.

(g) There must be means to warn ap-

propriate crewmembers if the malfunc-
tioning of any part of the electrical

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14 CFR Ch. I (1–1–24 Edition)

§ 29.1181

system is causing the continuous dis-
charge of any battery necessary for en-
gine ignition.

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–12, 41 FR 55473, Dec. 20,
1976]

OWERPLANT

IRE

ROTECTION

§ 29.1181

Designated fire zones: re-

gions included.

(a) Designated fire zones are—
(1) The engine power section of recip-

rocating engines;

(2) The engine accessory section of

reciprocating engines;

(3) Any complete powerplant com-

partment in which there is no isolation
between the engine power section and
the engine accessory section, for recip-
rocating engines;

(4) Any auxiliary power unit com-

partment;

(5) Any fuel-burning heater and other

combustion equipment installation de-
scribed in § 29.859;

(6) The compressor and accessory sec-

tions of turbine engines; and

(7) The combustor, turbine, and tail-

pipe sections of turbine engine instal-
lations except sections that do not con-
tain lines and components carrying
flammable fluids or gases and are iso-
lated from the designated fire zone pre-
scribed in paragraph (a)(6) of this sec-
tion by a firewall that meets § 29.1191.

(b) Each designated fire zone must

meet the requirements of §§ 29.1183
through 29.1203.

[Amdt. 29–3, 33 FR 970, Jan. 26, 1968, as
amended by Amdt. 29–26, 53 FR 34219, Sept. 2,
1988]

§ 29.1183

Lines, fittings, and compo-

nents.

(a) Except as provided in paragraph

(b) of this section, each line, fitting,
and other component carrying flam-
mable fluid in any area subject to en-
gine fire conditions and each compo-
nent which conveys or contains flam-
mable fluid in a designated fire zone
must be fire resistant, except that
flammable fluid tanks and supports in
a designated fire zone must be fireproof
or be enclosed by a fireproof shield un-
less damage by fire to any non-fire-
proof part will not cause leakage or
spillage of flammable fluid. Compo-

nents must be shielded or located so as
to safeguard against the ignition of
leaking flammable fluid. An integral
oil sump of less than 25-quart capacity
on a reciprocating engine need not be
fireproof nor be enclosed by a fireproof
shield.

(b) Paragraph (a) of this section does

not apply to—

(1) Lines, fittings, and components

which are already approved as part of a
type certificated engine; and

(2) Vent and drain lines, and their fit-

tings, whose failure will not result in
or add to, a fire hazard.

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–2, 32 FR 6914, May 5,
1967; Amdt. 29–10, 39 FR 35463, Oct. 1, 1974;
Amdt. 29–22, 49 FR 6850, Feb. 23, 1984]

§ 29.1185

Flammable fluids.

(a) No tank or reservoir that is part

of a system containing flammable
fluids or gases may be in a designated
fire zone unless the fluid contained, the
design of the system, the materials
used in the tank and its supports, the
shutoff means, and the connections,
lines, and controls provide a degree of
safety equal to that which would exist
if the tank or reservoir were outside
such a zone.

(b) Each fuel tank must be isolated

from the engines by a firewall or
shroud.

inch of clear airspace between each
tank or reservoir and each firewall or
shroud isolating a designated fire zone,
unless equivalent means are used to
prevent heat transfer from the fire
zone to the flammable fluid.

(d) Absorbent material close to flam-

mable fluid system components that
might leak must be covered or treated
to prevent the absorption of hazardous
quantities of fluids.

§ 29.1187

Drainage and ventilation of

fire zones.

(a) There must be complete drainage

of each part of each designated fire
zone to minimize the hazards resulting
from failure or malfunction of any
component containing flammable
fluids. The drainage means must be—

(1) Effective under conditions ex-

pected to prevail when drainage is
needed; and