321 

Federal Aviation Administration, DOT 

§ 125.119 

(c) Thermal/acoustic insulation ma-

terials. For transport category air-
planes type certificated after January 
1, 1958: 

(1) For airplanes manufactured before 

September 2, 2005, when thermal/acous-
tic insulation is installed in the fuse-
lage as replacements after September 
2, 2005, the insulation must meet the 
flame propagation requirements of 
§ 25.856 of this chapter, effective Sep-
tember 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 in-
sulation materials installed in the fu-
selage must meet the flame propaga-
tion requirements of § 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] 

§ 125.115

Internal doors. 

In any case where internal doors are 

equipped with louvres or other ven-
tilating means, there must be a means 
convenient to the crew for closing the 
flow of air through the door when nec-
essary. 

§ 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. 

§ 125.119

Fire precautions. 

(a) Each compartment must be de-

signed so that, when used for storing 
cargo or baggage, it meets the fol-
lowing requirements: 

(1) No compartment may include con-

trols, wiring, lines, equipment, or ac-
cessories that would upon damage or 
failure, affect the safe operation of the 
airplane unless the item is adequately 
shielded, isolated, or otherwise pro-
tected so that it cannot be damaged by 

movement of cargo in the compart-
ment and so that damage to or failure 
of the item would not create a fire haz-
ard in the compartment. 

(2) Cargo or baggage may not inter-

fere with the functioning of the fire- 
protective features of the compart-
ment. 

(3) Materials used in the construction 

of the compartments, including tie- 
down 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 com-

partments 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 sta-
tion, and all parts of the compartment 
are easily accessible in flight. There 
must be a hand fire extinguisher avail-
able for each Class A compartment. 

(c) 

Class B. 

Cargo and baggage com-

partments 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 com-
partment is so designed that, when the 
access provisions are being used, no 
hazardous amount of smoke, flames, or 
extinguishing agent enters any com-
partment occupied by the crew or pas-
sengers. 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 ex-

tinguisher available for the compart-
ment. 

(3) It must be lined with fire-resist-

ant material, except that additional 
service lining of flame-resistant mate-
rial may be used. 

(d) 

Class C. 

Cargo and baggage com-

partments are classified in the ‘‘C’’ cat-
egory if they do not conform with the 
requirements for the ‘‘A’’, ‘‘B’’, ‘‘D’’, or 
‘‘E’’ categories. Each Class C compart-
ment must comply with the following: 

(1) It must have a separate approved 

smoke or fire detector system to give 

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