333 

Federal Aviation Administration, DOT 

§ 125.119 

compartment used by the crew or pas-
sengers that do not meet the following 
requirements must be replaced with 
materials that meet these require-
ments: 

(1) For an airplane for which the ap-

plication for the type certificate was 
filed prior to May 1, 1972, § 25.853 in ef-
fect on April 30, 1972. 

(2) For an airplane for which the ap-

plication for the type certificate was 
filed on or after May 1, 1972, the mate-
rials requirement under which the air-
plane was type certificated. 

(b) Except as provided in paragraph 

(a) of this section, each compartment 
used by the crew or passengers must 
meet the following requirements: 

(1) Materials must be at least flash 

resistant. 

(2) The wall and ceiling linings and 

the covering of upholstering, floors, 
and furnishings must be flame resist-
ant. 

(3) Each compartment where smok-

ing is to be allowed must be equipped 
with self-contained ash trays that are 
completely removable and other com-
partments must be placarded against 
smoking. 

(4) Each receptacle for used towels, 

papers, and wastes must be of fire-re-
sistant material and must have a cover 
or other means of containing possible 
fires started in the receptacles. 

(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