Federal Aviation Administration, DOT

Section 25.857

the functioning of the fire protective
features of the compartment.
(g) Sources of heat within the compartment must be shielded and insulated to prevent igniting the cargo or
baggage.
(h) Flight tests must be conducted to
show compliance with the provisions of
Section 25.857 concerning - 
(1) Compartment accessibility,
(2) The entries of hazardous quantities of smoke or extinguishing agent
into compartments occupied by the
crew or passengers, and
(3) The dissipation of the extinguishing agent in all Class C compartments 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 compartment would occur as a result of
fire contained in any other compartment, either during or after extinguishment, unless the extinguishing
system floods each such compartment
simultaneously.
(j) Cargo or baggage compartment
electrical wiring interconnection system components must meet the requirements of Section 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]

spaschal on DSK3GDR082PROD with CFR

Section 25.856 Thermal/Acoustic
materials.

insulation

(a) Thermal/acoustic insulation material installed in the fuselage must
meet the flame propagation test requirements of part VI of Appendix F to
this part, or other approved equivalent
test requirements. This requirement
does not apply to  - small parts, -  as defined in part I of Appendix F of this
part.
(b) For airplanes with a passenger capacity of 20 or greater, thermal/acoustic 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 requirements of part VII of Appendix F
to this part, or other approved equivalent test requirements. This require-

ment does not apply to thermal/acoustic insulation installations that the
FAA finds would not contribute to fire
penetration resistance.
[Amdt. 25-111, 68 FR 45059, July 31, 2003]

Section 25.857 Cargo compartment classification.
(a) Class A; A Class A cargo or baggage 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 baggage compartment is one in which - 
(1) There is sufficient access in flight
to enable a crewmember, standing at
any one access point and without stepping into the compartment, to extinguish a fire occurring in any part of
the compartment using a hand fire extinguisher;
(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 baggage 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 hazardous quantities of smoke, flames, or
extinguishing agent, from any compartment occupied by the crew or passengers;
(4) There are means to control ventilation and drafts within the compartment 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 compartment is one on airplanes used only for
the carriage of cargo and in which - 
(1) [Reserved]

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