Federal Aviation Administration, DOT

Section 25.1187

(7) Combustor, turbine, and tailpipe
sections of turbine engine installations
that contain lines or components carrying flammable fluids or gases.
(b) Each designated fire zone must
meet the requirements of SectionSection 25.863,
25.865, 25.867, 25.869, and 25.1185 through
25.1203.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-11, 32 FR 6913, May 5,
1967; Amdt. 25-23, 35 FR 5677, Apr. 8, 1970;
Amdt. 25-72, 55 FR 29785, July 20, 1990; Amdt.
25-115, 69 FR 40527, July 2, 2004]

Section 25.1182 Nacelle areas behind firewalls, and engine pod attaching
structures containing flammable
fluid lines.
(a) Each nacelle area immediately
behind the firewall, and each portion of
any engine pod attaching structure
containing flammable fluid lines, must
meet each requirement of SectionSection 25.1103(b),
25.1165 (d) and (e), 25.1183, 25.1185(c),
25.1187, 25.1189, and 25.1195 through
25.1203, including those concerning designated fire zones. However, engine pod
attaching structures need not contain
fire detection or extinguishing means.
(b) For each area covered by paragraph (a) of this section that contains
a retractable landing gear, compliance
with that paragraph need only be
shown with the landing gear retracted.

spaschal on DSK3GDR082PROD with CFR

[Amdt. 25-11, 32 FR 6913, May 5, 1967]

Section 25.1183 Flammable
fluid-carrying
components.
(a) Except as provided in paragraph
(b) of this section, each line, fitting,
and other component carrying flammable fluid in any area subject to engine fire conditions, and each component which conveys or contains flammable 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 unless damage by fire to any non-fireproof part will not cause leakage or
spillage of flammable fluid. Components must be shielded or located 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 fittings, whose failure will not result in,
or add to, a fire hazard.
(c) All components, including ducts,
within a designated fire zone must be
fireproof if, when exposed to or damaged by fire, they could - 
(1) Result in fire spreading to other
regions of the airplane; or
(2) Cause unintentional operation of,
or inability to operate, essential services or equipment.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-11, 32 FR 6913, May 5,
1967; Amdt. 25-36, 39 FR 35461, Oct. 1, 1974;
Amdt. 25-57, 49 FR 6849, Feb. 23, 1984; Amdt.
25-101, 65 FR 79710, Dec. 19, 2000]

Section 25.1185

Flammable fluids.

(a) Except for the integral oil sumps
specified in Section 25.1183(a), no tank or reservoir that is a 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,
the shut-off means, and all connections, lines, and control provide a degree of safety equal to that which
would exist if the tank or reservoir
were outside such a zone.
(b) 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.
(c) Absorbent materials close to
flammable fluid system components
that might leak must be covered or
treated to prevent the absorption of
hazardous quantities of fluids.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-19, 33 FR 15410, Oct. 17,
1968; Amdt. 25-94, 63 FR 8848, Feb. 23, 1998]

Section 25.1187 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 malfunctioning of any
component
containing
flammable
fluids. The drainage means must be - 

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