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14 CFR Ch. I (1–1–24 Edition) 

§ 25.1182 

(7) Combustor, turbine, and tailpipe 

sections of turbine engine installations 
that contain lines or components car-
rying flammable fluids or gases. 

(b) Each designated fire zone must 

meet the requirements of §§ 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] 

§ 25.1182

Nacelle areas behind fire-

walls, 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 §§ 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 des-
ignated fire zones. However, engine pod 
attaching structures need not contain 
fire detection or extinguishing means. 

(b) For each area covered by para-

graph (a) of this section that contains 
a retractable landing gear, compliance 
with that paragraph need only be 
shown with the landing gear retracted. 

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

§ 25.1183

Flammable fluid-carrying 

components. 

(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 to 
safeguard against the ignition of leak-
ing flammable fluid. An integral oil 
sump of less than 25-quart capacity on 
a reciprocating engine need not be fire-
proof 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. 

(c) All components, including ducts, 

within a designated fire zone must be 
fireproof if, when exposed to or dam-
aged 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 serv-
ices 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] 

§ 25.1185

Flammable fluids. 

(a) Except for the integral oil sumps 

specified in § 25.1183(a), no tank or res-
ervoir that is a part of a system con-
taining flammable fluids or gases may 
be in a designated fire zone unless the 
fluid contained, the design of the sys-
tem, the materials used in the tank, 
the shut-off means, and all connec-
tions, lines, and control provide a de-
gree 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] 

§ 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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