305 

Federal Aviation Administration, DOT 

§ 25.857 

the functioning of the fire protective 
features of the compartment. 

(g) Sources of heat within the com-

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

(h) Flight tests must be conducted to 

show compliance with the provisions of 
§ 25.857 concerning— 

(1) Compartment accessibility, 
(2) The entries of hazardous quan-

tities of smoke or extinguishing agent 
into compartments occupied by the 
crew or passengers, and 

(3) The dissipation of the extin-

guishing agent in all Class C compart-
ments and, if applicable, in any Class F 
compartments. 

(i) During the above tests, it must be 

shown that no inadvertent operation of 
smoke or fire detectors in any com-
partment would occur as a result of 
fire contained in any other compart-
ment, either during or after extin-
guishment, unless the extinguishing 
system floods each such compartment 
simultaneously. 

(j) Cargo or baggage compartment 

electrical wiring interconnection sys-
tem components must meet the re-
quirements of § 25.1721. 

[Amdt. 25–72, 55 FR 29784, July 20, 1990, as 
amended by Amdt. 25–93, 63 FR 8048, Feb. 17, 
1998; Amdt. 25–116, 69 FR 62788, Oct. 27, 2004; 
Amdt. 25–123, 72 FR 63405, Nov. 8, 2007; Doc. 
No. Docket FAA–2014–0001, Amdt. 25–142, 81 
FR 7704, Feb. 16, 2016] 

§ 25.856

Thermal/Acoustic insulation 

materials. 

(a) Thermal/acoustic insulation ma-

terial installed in the fuselage must 
meet the flame propagation test re-
quirements of part VI of Appendix F to 
this part, or other approved equivalent 
test requirements. This requirement 
does not apply to ‘‘small parts,’’ as de-
fined in part I of Appendix F of this 
part. 

(b) For airplanes with a passenger ca-

pacity of 20 or greater, thermal/acous-
tic insulation materials (including the 
means of fastening the materials to the 
fuselage) installed in the lower half of 
the airplane fuselage must meet the 
flame penetration resistance test re-
quirements of part VII of Appendix F 
to this part, or other approved equiva-
lent test requirements. This require-

ment does not apply to thermal/acous-
tic insulation installations that the 
FAA finds would not contribute to fire 
penetration resistance. 

[Amdt. 25–111, 68 FR 45059, July 31, 2003] 

§ 25.857

Cargo compartment classifica-

tion. 

(a) 

Class A; 

A Class A cargo or bag-

gage compartment is one in which— 

(1) The presence of a fire would be 

easily discovered by a crewmember 
while at his station; and 

(2) Each part of the compartment is 

easily accessible in flight. 

(b) 

Class B. 

A Class B cargo or bag-

gage compartment is one in which— 

(1) There is sufficient access in flight 

to enable a crewmember, standing at 
any one access point and without step-
ping into the compartment, to extin-
guish a fire occurring in any part of 
the compartment using a hand fire ex-
tinguisher; 

(2) When the access provisions are 

being used, no hazardous quantity of 
smoke, flames, or extinguishing agent, 
will enter any compartment occupied 
by the crew or passengers; 

(3) There is a separate approved 

smoke detector or fire detector system 
to give warning at the pilot or flight 
engineer station. 

(c) 

Class C. 

A Class C cargo or bag-

gage compartment is one not meeting 
the requirements for either a Class A 
or B compartment but in which— 

(1) There is a separate approved 

smoke detector or fire detector system 
to give warning at the pilot or flight 
engineer station; 

(2) There is an approved built-in fire 

extinguishing or suppression system 
controllable from the cockpit. 

(3) There are means to exclude haz-

ardous quantities of smoke, flames, or 
extinguishing agent, from any com-
partment occupied by the crew or pas-
sengers; 

(4) There are means to control ven-

tilation and drafts within the compart-
ment so that the extinguishing agent 
used can control any fire that may 
start within the compartment. 

(d) [Reserved] 
(e) 

Class E. 

A Class E cargo compart-

ment is one on airplanes used only for 
the carriage of cargo and in which— 

(1) [Reserved] 

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