649 

Federal Aviation Administration, DOT 

§ 29.1187 

between the engine power section and 
the engine accessory section, for recip-
rocating engines; 

(4) Any auxiliary power unit com-

partment; 

(5) Any fuel-burning heater and other 

combustion equipment installation de-
scribed in § 29.859; 

(6) The compressor and accessory sec-

tions of turbine engines; and 

(7) The combustor, turbine, and tail-

pipe sections of turbine engine instal-
lations except sections that do not con-
tain lines and components carrying 
flammable fluids or gases and are iso-
lated from the designated fire zone pre-
scribed in paragraph (a)(6) of this sec-
tion by a firewall that meets § 29.1191. 

(b) Each designated fire zone must 

meet the requirements of §§ 29.1183 
through 29.1203. 

[Amdt. 29–3, 33 FR 970, Jan. 26, 1968, as 
amended by Amdt. 29–26, 53 FR 34219, Sept. 2, 
1988] 

§ 29.1183

Lines, fittings, and compo-

nents. 

(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 so as 
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. 

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