769 

Federal Aviation Administration, DOT 

§ 29.859 

with materials in accordance with the 
following: 

(1) For accessible and inaccessible 

compartments not occupied by pas-
sengers or crew, the material must be 
at least fire resistant. 

(2) Materials must meet the require-

ments in § 29.853(a)(1), (a)(2), and (a)(3) 
for cargo or baggage compartments in 
which— 

(i) The presence of a compartment 

fire would be easily discovered by a 
crewmember while at the crew-
member’s station; 

(ii) Each part of the compartment is 

easily accessible in flight; 

(iii) The compartment has a volume 

of 200 cubic feet or less; and 

(iv) Notwithstanding § 29.1439(a), pro-

tective breathing equipment is not re-
quired. 

(b) No compartment may contain any 

controls, wiring, lines, equipment, or 
accessories whose damage or failure 
would affect safe operation, unless 
those items are protected so that— 

(1) They cannot be damaged by the 

movement of cargo in the compart-
ment; and 

(2) Their breakage or failure will not 

create a fire hazard. 

(c) The design and sealing of inacces-

sible compartments must be adequate 
to contain compartment fires until a 
landing and safe evacuation can be 
made. 

(d) Each cargo and baggage compart-

ment that is not sealed so as to contain 
cargo compartment fires completely 
without endangering the safety of a 
rotorcraft or its occupants must be de-
signed, or must have a device, to en-
sure detection of fires or smoke by a 
crewmember while at his station and 
to prevent the accumulation of harm-
ful quantities of smoke, flame, extin-
guishing agents, and other noxious 
gases in any crew or passenger com-
partment. This must be shown in 
flight. 

(e) For rotorcraft used for the car-

riage of cargo only, the cabin area may 
be considered a cargo compartment 
and, in addition to paragraphs (a) 
through (d) of this section, the fol-
lowing apply: 

(1) There must be means to shut off 

the ventilating airflow to or within the 
compartment. Controls for this purpose 

must be accessible to the flight crew in 
the crew compartment. 

(2) Required crew emergency exits 

must be accessible under all cargo 
loading conditions. 

(3) Sources of heat within each com-

partment must be shielded and insu-
lated to prevent igniting the cargo. 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–3, 33 FR 969, Jan. 26, 
1968; Amdt. 29–24, 49 FR 44438, Nov. 6, 1984; 
Amdt. 27–26, 55 FR 8004, Mar. 6, 1990] 

§ 29.859

Combustion heater fire pro-

tection. 

(a) 

Combustion heater fire zones. The 

following combustion heater fire zones 
must be protected against fire under 
the applicable provisions of §§ 29.1181 
through 29.1191, and 29.1195 through 
29.1203: 

(1) The region surrounding any heat-

er, if that region contains any flam-
mable fluid system components (in-
cluding the heater fuel system), that 
could— 

(i) Be damaged by heater malfunc-

tioning; or 

(ii) Allow flammable fluids or vapors 

to reach the heater in case of leakage. 

(2) Each part of any ventilating air 

passage that— 

(i) Surrounds the combustion cham-

ber; and 

(ii) Would not contain (without dam-

age to other rotorcraft components) 
any fire that may occur within the pas-
sage. 

(b) 

Ventilating air ducts. Each ven-

tilating air duct passing through any 
fire zone must be fireproof. In addi-
tion— 

(1) Unless isolation is provided by 

fireproof valves or by equally effective 
means, the ventilating air duct down-
stream of each heater must be fireproof 
for a distance great enough to ensure 
that any fire originating in the heater 
can be contained in the duct; and 

(2) Each part of any ventilating duct 

passing through any region having a 
flammable fluid system must be so 
constructed or isolated from that sys-
tem that the malfunctioning of any 
component of that system cannot in-
troduce flammable fluids or vapors 
into the ventilating airstream. 

(c) 

Combustion air ducts. Each com-

bustion air duct must be fireproof for a 

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