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14 CFR Ch. I (1–1–14 Edition) 

§ 23.855 

compartments unless adequately 
shielded, isolated, or otherwise pro-
tected so that any breakage or failure 
of such an item would not create a haz-
ard. 

(f) Airplane materials located on the 

cabin side of the firewall must be self- 
extinguishing or be located at such a 
distance from the firewall, or otherwise 
protected, so that ignition will not 
occur if the firewall is subjected to a 
flame temperature of not less than 
2,000 degrees F for 15 minutes. For self- 
extinguishing materials (except elec-
trical wire and cable insulation and 
small parts that the Administrator 
finds would not contribute signifi-
cantly to the propagation of a fire), a 
vertifical self-extinguishing test must 
be conducted in accordance with appen-
dix F of this part or an equivalent 
method approved by the Adminis-
trator. The average burn length of the 
material may not exceed 6 inches and 
the average flame time after removal 
of the flame source may not exceed 15 
seconds. Drippings from the material 
test specimen may not continue to 
flame for more than an average of 3 
seconds after falling. 

[Amdt. 23–14, 23 FR 31822, Nov. 19, 1973, as 
amended by Amdt. 23–23, 43 FR 50593, Oct. 30, 
1978; Amdt. 23–25, 45 FR 7755, Feb. 4, 1980; 
Amdt. 23–34, 52 FR 1831, Jan. 15, 1987; Amdt. 
23–62, 76 FR 75759, Dec. 2, 2011] 

§ 23.855

Cargo and baggage compart-

ment fire protection. 

(a) Sources of heat within each cargo 

and baggage compartment that are ca-
pable of igniting the compartment con-
tents must be shielded and insulated to 
prevent such ignition. 

(b) Each cargo and baggage compart-

ment must be constructed of materials 
that meet the appropriate provisions of 
§ 23.853(d)(3). 

(c) In addition, for commuter cat-

egory airplanes, each cargo and bag-
gage compartment must: 

(1) Be located where the presence of a 

fire would be easily discovered by the 
pilots when seated at their duty sta-
tion, or it must be equipped with a 
smoke or fire detector system to give a 
warning at the pilots’ station, and pro-
vide sufficient access to enable a pilot 
to effectively reach any part of the 

compartment with the contents of a 
hand held fire extinguisher, or 

(2) Be equipped with a smoke or fire 

detector system to give a warning at 
the pilots’ station and have ceiling and 
sidewall liners and floor panels con-
structed of materials that have been 
subjected to and meet the 45 degree 
angle test of appendix F of this part. 
The flame may not penetrate (pass 
through) the material during applica-
tion of the flame or subsequent to its 
removal. The average flame time after 
removal of the flame source may not 
exceed 15 seconds, and the average glow 
time may not exceed 10 seconds. The 
compartment must be constructed to 
provide fire protection that is not less 
than that required of its individual 
panels; or 

(3) Be constructed and sealed to con-

tain any fire within the compartment. 

[Doc. No. 27806, 61 FR 5167, Feb. 9, 1996] 

§ 23.856

Thermal/acoustic insulation 

materials. 

Thermal/acoustic insulation material 

installed in the fuselage must meet the 
flame propagation test requirements of 
part II of Appendix F to this part, or 
other approved equivalent test require-
ments. This requirement does not 
apply to ‘‘small parts,’’ as defined in 
§ 23.853(d)(3)(v). 

[Amdt. 23–62, 76 FR 75759, Dec. 2, 2011] 

§ 23.859

Combustion heater fire pro-

tection. 

(a) 

Combustion heater fire regions. The 

following combustion heater fire re-
gions must be protected from fire in ac-
cordance with the applicable provisions 
of §§ 23.1182 through 23.1191 and 23.1203: 

(1) The region surrounding the heat-

er, if this region contains any flam-
mable fluid system components (ex-
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) The region surrounding the heat-

er, if the heater fuel system has fit-
tings that, if they leaked, would allow 
fuel vapor to enter this region. 

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