Federal Aviation Administration, DOT

Section 125.119

(c) Thermal/acoustic insulation materials. For transport category airplanes type certificated after January
1, 1958:
(1) For airplanes manufactured before
September 2, 2005, when thermal/acoustic insulation is installed in the fuselage as replacements after September
2, 2005, the insulation must meet the
flame propagation requirements of
Section 25.856 of this chapter, effective September 2, 2003, if it is:
(i) of a blanket construction or
(ii) Installed around air ducting.
(2) For airplanes manufactured after
September 2, 2005, thermal/acoustic insulation materials installed in the fuselage must meet the flame propagation requirements of Section 25.856 of this
chapter, effective September 2, 2003.
[Doc. No. 19799, 45 FR 67235, Oct. 9, 1980, as
amended by Amdt. 125-43, 68 FR 45084, July
31, 2003; Amdt. 125-50, 70 FR 77752, Dec. 30,
2005]

Section 125.115 Internal doors.
In any case where internal doors are
equipped with louvres or other ventilating means, there must be a means
convenient to the crew for closing the
flow of air through the door when necessary.
Section 125.117 Ventilation.
Each passenger or crew compartment
must be suitably ventilated. Carbon
monoxide concentration may not be
more than one part in 20,000 parts of
air, and fuel fumes may not be present.
In any case where partitions between
compartments have louvres or other
means allowing air to flow between
compartments, there must be a means
convenient to the crew for closing the
flow of air through the partitions when
necessary.
Section 125.119 Fire precautions.
(a) Each compartment must be designed so that, when used for storing
cargo or baggage, it meets the following requirements:
(1) No compartment may include controls, wiring, lines, equipment, or accessories that would upon damage or
failure, affect the safe operation of the
airplane unless the item is adequately
shielded, isolated, or otherwise protected so that it cannot be damaged by

movement of cargo in the compartment and so that damage to or failure
of the item would not create a fire hazard in the compartment.
(2) Cargo or baggage may not interfere with the functioning of the fireprotective features of the compartment.
(3) Materials used in the construction
of the compartments, including tiedown equipment, must be at least
flame resistant.
(4) Each compartment must include
provisions for safeguarding against
fires according to the classifications
set forth in paragraphs (b) through (f)
of this section.
(b) Class A. Cargo and baggage compartments are classified in the  - A - 
category if a fire therein would be
readily discernible to a member of the
crew while at that crewmember-s station, and all parts of the compartment
are easily accessible in flight. There
must be a hand fire extinguisher available for each Class A compartment.
(c) Class B. Cargo and baggage compartments are classified in the  - B - 
category if enough access is provided
while in flight to enable a member of
the crew to effectively reach all of the
compartment and its contents with a
hand fire extinguisher and the compartment is so designed that, when the
access provisions are being used, no
hazardous amount of smoke, flames, or
extinguishing agent enters any compartment occupied by the crew or passengers. Each Class B compartment
must comply with the following:
(1) It must have a separate approved
smoke or fire detector system to give
warning at the pilot or flight engineer
station.
(2) There must be a hand-held fire extinguisher available for the compartment.
(3) It must be lined with fire-resistant material, except that additional
service lining of flame-resistant material may be used.
(d) Class C. Cargo and baggage compartments are classified in the  - C -  category if they do not conform with the
requirements for the  - A - ,  - B - ,  - D - , or
 - E -  categories. Each Class C compartment must comply with the following:
(1) It must have a separate approved
smoke or fire detector system to give

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