799
Federal Aviation Administration, DOT
§ 29.1194
(e) Each shutoff valve and its control
must be designed, located, and pro-
tected to function properly under any
condition likely to result from fire in a
designated fire zone.
(f) Except for ground-use-only auxil-
iary power unit installations, there
must be means to prevent inadvertent
operation of each shutoff and to make
it possible to reopen it in flight after it
has been closed.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–12, 41 FR 55473, Dec. 20,
1976; Amdt. 29–22, 49 FR 6850, Feb. 23, 1984;
Amdt. 29–26, 53 FR 34219, Sept. 2, 1988]
§ 29.1191
Firewalls.
(a) Each engine, including the com-
bustor, turbine, and tailpipe sections of
turbine engine installations, must be
isolated by a firewall, shroud, or equiv-
alent means, from personnel compart-
ments, structures, controls, rotor
mechanisms, and other parts that are—
(1) Essential to controlled flight and
landing; and
(2) Not protected under § 29.861.
(b) Each auxiliary power unit, com-
bustion heater, and other combustion
equipment to be used in flight, must be
isolated from the rest of the rotorcraft
by firewalls, shrouds, or equivalent
means.
(c) Each firewall or shroud must be
constructed so that no hazardous quan-
tity of air, fluid, or flame can pass
from any engine compartment to other
parts of the rotorcraft.
(d) Each opening in the firewall or
shroud must be sealed with close-fit-
ting fireproof grommets, bushings, or
firewall fittings.
(e) Each firewall and shroud must be
fireproof and protected against corro-
sion.
(f) In meeting this section, account
must be taken of the probable path of
a fire as affected by the airflow in nor-
mal flight and in autorotation.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–3, 33 FR 970, Jan. 26,
1968]
§ 29.1193
Cowling and engine compart-
ment covering.
(a) Each cowling and engine compart-
ment covering must be constructed and
supported so that it can resist the vi-
bration, inertia, and air loads to which
it may be subjected in operation.
(b) Cowling must meet the drainage
and ventilation requirements of
§ 29.1187.
(c) On rotorcraft with a diaphragm
isolating the engine power section from
the engine accessory section, each part
of the accessory section cowling sub-
ject to flame in case of fire in the en-
gine power section of the powerplant
must—
(1) Be fireproof; and
(2) Meet the requirements of § 29.1191.
(d) Each part of the cowling or engine
compartment covering subject to high
temperatures due to its nearness to ex-
haust system parts or exhaust gas im-
pingement must be fireproof.
(e) Each rotorcraft must—
(1) Be designated and constructed so
that no fire originating in any fire zone
can enter, either through openings or
by burning through external skin, any
other zone or region where it would
create additional hazards;
(2) Meet the requirements of para-
graph (e)(1) of this section with the
landing gear retracted (if applicable);
and
(3) Have fireproof skin in areas sub-
ject to flame if a fire starts in or burns
out of any designated fire zone.
(f) A means of retention for each
openable or readily removable panel,
cowling, or engine or rotor drive sys-
tem covering must be provided to pre-
clude hazardous damage to rotors or
critical control components in the
event of—
(1) Structural or mechanical failure
of the normal retention means, unless
such failure is extremely improbable;
or
(2) Fire in a fire zone, if such fire
could adversely affect the normal
means of retention.
(Secs. 313(a), 601, and 603, 72 Stat. 759, 775, 49
U.S.C. 1354(a), 1421, and 1423; sec. 6(c), 49
U.S.C. 1655(c))
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–3, 33 FR 970, Jan. 26,
1968; Amdt. 29–13, 42 FR 15046, Mar. 17, 1977;
Amdt. 29–26, 53 FR 34219, Sept. 2, 1988]
§ 29.1194
Other surfaces.
All surfaces aft of, and near, engine
compartments and designated fire
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