797
Federal Aviation Administration, DOT
§ 29.1183
(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.
(c) The design of the engine ignition
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
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]
P
OWERPLANT
F
IRE
P
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
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