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Federal Aviation Administration, DOT 

§ 121.221 

(c) Each certificate holder must com-

ply with the requirements of §§ 121.285 
through 121.291. 

(d) If the Administrator determines 

that, for a particular model of airplane 
used in cargo service, literal compli-
ance with any requirement under para-
graph (b) of this section would be ex-
tremely difficult and that compliance 
would not contribute materially to the 
objective sought, he may require com-
pliance only with those requirements 
that are necessary to accomplish the 
basic objectives of this part. 

(e) No person may operate under this 

part a nontransport category airplane 
type certificated after December 31, 
1964, unless the airplane meets the spe-
cial airworthiness requirements in 
§ 121.293. 

[Doc. No. 28154, 60 FR 65928, Dec. 20, 1995] 

§ 121.213 [Reserved] 

§ 121.215 Cabin interiors. 

(a) Except as provided in § 121.312, 

each compartment used by the crew or 
passengers must meet the require-
ments of this section. 

(b) Materials must be at least flash 

resistant. 

(c) The wall and ceiling linings and 

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

(d) 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. 

(e) 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. 

[Doc. No. 6258, 29 FR 19202, Dec. 31, 1964, as 
amended by Amdt. 121–84, 37 FR 3974, Feb. 24, 
1972] 

§ 121.217 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. 

§ 121.219 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. 

§ 121.221 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— 

(1) A fire therein would be readily 

discernible to a member of the crew 
while at his station; and 

(2) All parts of the compartment are 

easily accessible in flight. 

There must be a hand fire extinguisher 
available for each Class A compart-
ment. 

(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