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14 CFR Ch. I (1–1–19 Edition) 

§ 23.2325 

(c) The airplane must provide each 

occupant with air at a breathable pres-
sure, free of hazardous concentrations 
of gases, vapors, and smoke during nor-
mal operations and likely failures. 

(d) If a pressurization system is in-

stalled in the airplane, it must be de-
signed to protect against— 

(1) Decompression to an unsafe level; 


(2) Excessive differential pressure. 
(e) If an oxygen system is installed in 

the airplane, it must— 

(1) Effectively provide oxygen to each 

user to prevent the effects of hypoxia; 

(2) Be free from hazards in itself, in 

its method of operation, and its effect 
upon other components. 










§ 23.2325

Fire protection. 

(a) The following materials must be 


(1) Insulation on electrical wire and 

electrical cable; 

(2) For levels 1, 2, and 3 airplanes, 

materials in the baggage and cargo 
compartments inaccessible in flight; 

(3) For level 4 airplanes, materials in 

the cockpit, cabin, baggage, and cargo 

(b) The following materials must be 

flame resistant— 

(1) For levels 1, 2 and 3 airplanes, ma-

terials in each compartment accessible 
in flight; and 

(2) Any equipment associated with 

any electrical cable installation and 
that would overheat in the event of cir-
cuit overload or fault. 

(c) Thermal/acoustic materials in the 

fuselage, if installed, must not be a 
flame propagation hazard. 

(d) Sources of heat within each bag-

gage and cargo compartment that are 
capable of igniting adjacent objects 
must be shielded and insulated to pre-
vent such ignition. 

(e) For level 4 airplanes, each bag-

gage and cargo compartment must— 

(1) Be located where a fire would be 

visible to the pilots, or equipped with a 
fire detection system and warning sys-
tem; and 

(2) Be accessible for the manual ex-

tinguishing of a fire, have a built-in 

fire extinguishing system, or be con-
structed and sealed to contain any fire 
within the compartment. 

(f) There must be a means to extin-

guish any fire in the cabin such that— 

(1) The pilot, while seated, can easily 

access the fire extinguishing means; 

(2) For levels 3 and 4 airplanes, pas-

sengers have a fire extinguishing 
means available within the passenger 

(g) Each area where flammable fluids 

or vapors might escape by leakage of a 
fluid system must— 

(1) Be defined; and 
(2) Have a means to minimize the 

probability of fluid and vapor ignition, 
and the resultant hazard, if ignition oc-

(h) Combustion heater installations 

must be protected from uncontained 

§ 23.2330

Fire protection in designated 

fire zones and adjacent areas. 

(a) Flight controls, engine mounts, 

and other flight structures within or 
adjacent to designated fire zones must 
be capable of withstanding the effects 
of a fire. 

(b) Engines in a designated fire zone 

must remain attached to the airplane 
in the event of a fire. 

(c) In designated fire zones, termi-

nals, equipment, and electrical cables 
used during emergency procedures 
must be fire-resistant. 

§ 23.2335

Lightning protection. 

The airplane must be protected 

against catastrophic effects from light-

Subpart E—Powerplant 

§ 23.2400

Powerplant installation. 

(a) For the purpose of this subpart, 

the airplane powerplant installation 
must include each component nec-
essary for propulsion, which affects 
propulsion safety, or provides auxiliary 
power to the airplane. 

(b) Each airplane engine and pro-

peller must be type certificated, except 
for engines and propellers installed on 
level 1 low-speed airplanes, which may 
be approved under the airplane type 

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