Section 29.1189

14 CFR Ch. I (1-1-19 Edition)

(d) Ventilation means must be arranged so that no discharged vapors
will cause an additional fire hazard.
(e) For category A rotorcraft, there
must be means to allow the crew to
shut off the sources of forced ventilation in any fire zone (other than the
engine power section of the powerplant
compartment) unless the amount of extinguishing agent and the rate of discharge are based on the maximum airflow through that zone.

spaschal on DSK3GDR082PROD with CFR

Section 29.1189

Shutoff means.

(a) There must be means to shut off
or otherwise prevent hazardous quantities of fuel, oil, de-icing fluid, and
other flammable fluids from flowing
into, within, or through any designated
fire zone, except that this means need
not be provided - 
(1) For lines, fittings, and components forming an integral part of an
engine;
(2) For oil systems for turbine engine
installations in which all components
of the system, including oil tanks, are
fireproof or located in areas not subject
to engine fire conditions; or
(3) For engine oil systems in category
B rotorcraft using reciprocating engines of less than 500 cubic inches displacement.
(b) The closing of any fuel shutoff
valve for any engine may not make
fuel unavailable to the remaining engines.
(c) For category A rotorcraft, no hazardous quantity of flammable fluid
may drain into any designated fire
zone after shutoff has been accomplished, nor may the closing of any fuel
shutoff valve for an engine make fuel
unavailable to the remaining engines.
(d) The operation of any shutoff may
not interfere with the later emergency
operation of any other equipment, such
as the means for declutching the engine from the rotor drive.
(e) Each shutoff valve and its control
must be designed, located, and protected to function properly under any
condition likely to result from fire in a
designated fire zone.
(f) Except for ground-use-only auxiliary 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]

Section 29.1191

Firewalls.

(a) Each engine, including the combustor, turbine, and tailpipe sections of
turbine engine installations, must be
isolated by a firewall, shroud, or equivalent means, from personnel compartments, structures, controls, rotor
mechanisms, and other parts that are - 
(1) Essential to controlled flight and
landing; and
(2) Not protected under Section 29.861.
(b) Each auxiliary power unit, combustion 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 quantity 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-fitting fireproof grommets, bushings, or
firewall fittings.
(e) Each firewall and shroud must be
fireproof and protected against corrosion.
(f) In meeting this section, account
must be taken of the probable path of
a fire as affected by the airflow in normal 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]

Section 29.1193 Cowling and engine compartment covering.
(a) Each cowling and engine compartment covering must be constructed and
supported so that it can resist the vibration, inertia, and air loads to which
it may be subjected in operation.
(b) Cowling must meet the drainage
and
ventilation
requirements
of
Section 29.1187.
(c) On rotorcraft with a diaphragm
isolating the engine power section from
the engine accessory section, each part

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