651 

Federal Aviation Administration, DOT 

§ 29.1193 

(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. 

(e) Each shutoff valve and its control 

must be designed, located, and pro-
tected to function properly under any 
condition likely to result from fire in a 
designated fire zone. 

(f) Except for ground-use-only auxil-

iary 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] 

§ 29.1191

Firewalls. 

(a) Each engine, including the com-

bustor, turbine, and tailpipe sections of 
turbine engine installations, must be 
isolated by a firewall, shroud, or equiv-
alent means, from personnel compart-
ments, structures, controls, rotor 
mechanisms, and other parts that are— 

(1) Essential to controlled flight and 

landing; and 

(2) Not protected under § 29.861. 
(b) Each auxiliary power unit, com-

bustion 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 quan-
tity 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-fit-
ting fireproof grommets, bushings, or 
firewall fittings. 

(e) Each firewall and shroud must be 

fireproof and protected against corro-
sion. 

(f) In meeting this section, account 

must be taken of the probable path of 
a fire as affected by the airflow in nor-
mal 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] 

§ 29.1193

Cowling and engine compart-

ment covering. 

(a) Each cowling and engine compart-

ment covering must be constructed and 

VerDate Sep<11>2014 

09:06 Jun 28, 2024

Jkt 262046

PO 00000

Frm 00661

Fmt 8010

Sfmt 8010

Y:\SGML\262046.XXX

262046

jspears on DSK121TN23PROD with CFR