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14 CFR Ch. I (1–1–14 Edition)
§ 29.1185
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.
(c) There must be at least one-half
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
(2) Arranged so that no discharged
fluid will cause an additional fire haz-
ard.
(b) Each designated fire zone must be
ventilated to prevent the accumulation
of flammable vapors.
(c) No ventilation opening may be
where it would allow the entry of flam-
mable fluids, vapors, or flame from
other zones.
(d) Ventilation means must be ar-
ranged 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 ventila-
tion in any fire zone (other than the
engine power section of the powerplant
compartment) unless the amount of ex-
tinguishing agent and the rate of dis-
charge are based on the maximum air-
flow through that zone.
§ 29.1189
Shutoff means.
(a) There must be means to shut off
or otherwise prevent hazardous quan-
tities 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 compo-
nents 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 en-
gines of less than 500 cubic inches dis-
placement.
(b) The closing of any fuel shutoff
valve for any engine may not make
fuel unavailable to the remaining en-
gines.
(c) For category A rotorcraft, no haz-
ardous quantity of flammable fluid
may drain into any designated fire
zone after shutoff has been accom-
plished, 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 en-
gine from the rotor drive.
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