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Federal Aviation Administration, DOT 

§ 25.1441 

elements and other systems or struc-
tural elements must remain adequate 
and there must be no detrimental ef-

[Doc. No. 28617, 66 FR 27402, May 16, 2001] 

§ 25.1438

Pressurization and pneu-

matic systems. 

(a) Pressurization system elements 

must be burst pressure tested to 2.0 
times, and proof pressure tested to 1.5 
times, the maximum normal operating 

(b) Pneumatic system elements must 

be burst pressure tested to 3.0 times, 
and proof pressure tested to 1.5 times, 
the maximum normal operating pres-

(c) An analysis, or a combination of 

analysis and test, may be substituted 
for any test required by paragraph (a) 
or (b) of this section if the Adminis-
trator finds it equivalent to the re-
quired test. 

[Amdt. 25–41, 42 FR 36971, July 18, 1977] 

§ 25.1439

Protective breathing equip-


(a) Fixed (stationary, or built in) pro-

tective breathing equipment must be 
installed for the use of the flightcrew, 
and at least one portable protective 
breathing equipment shall be located 
at or near the flight deck for use by a 
flight crewmember. In addition, port-
able protective breathing equipment 
must be installed for the use of appro-
priate crewmembers for fighting fires 
in compartments accessible in flight 
other than the flight deck. This in-
cludes isolated compartments and 
upper and lower lobe galleys, in which 
crewmember occupancy is permitted 
during flight. Equipment must be in-
stalled for the maximum number of 
crewmembers expected to be in the 
area during any operation. 

(b) For protective breathing equip-

ment required by paragraph (a) of this 
section or by the applicable Operating 

(1) The equipment must be designed 

to protect the appropriate crewmember 
from smoke, carbon dioxide, and other 
harmful gases while on flight deck 
duty or while combating fires. 

(2) The equipment must include— 

(i) Masks covering the eyes, nose and 

mouth, or 

(ii) Masks covering the nose and 

mouth, plus accessory equipment to 
cover the eyes. 

(3) Equipment, including portable 

equipment, must allow communication 
with other crewmembers while in use. 
Equipment available at flightcrew as-
signed duty stations must also enable 
the flightcrew to use radio equipment. 

(4) The part of the equipment pro-

tecting the eyes shall not cause any ap-
preciable adverse effect on vision and 
must allow corrective glasses to be 

(5) The equipment must supply pro-

tective oxygen of 15 minutes duration 
per crewmember at a pressure altitude 
of 8,000 feet with a respiratory minute 
volume of 30 liters per minute BTPD. 
The equipment and system must be de-
signed to prevent any inward leakage 
to the inside of the device and prevent 
any outward leakage causing signifi-
cant increase in the oxygen content of 
the local ambient atmosphere. If a de-
mand oxygen system is used, a supply 
of 300 liters of free oxygen at 70 °F. and 
760 mm. Hg. pressure is considered to 
be of 15-minute duration at the pre-
scribed altitude and minute volume. If 
a continuous flow open circuit protec-
tive breathing system is used, a flow 
rate of 60 liters per minute at 8,000 feet 
(45 liters per minute at sea level) and a 
supply of 600 liters of free oxygen at 70 
°F. and 760 mm. Hg. pressure is consid-
ered to be of 15-minute duration at the 
prescribed altitude and minute volume. 
Continuous flow systems must not in-
crease the ambient oxygen content of 
the local atmosphere above that of de-
mand systems. BTPD refers to body 
temperature conditions (that is, 37 °C., 
at ambient pressure, dry). 

(6) The equipment must meet the re-

quirements of § 25.1441. 

[Doc. No. FAA–2002–13859, 69 FR 40528, July 2, 

§ 25.1441

Oxygen equipment and sup-


(a) If certification with supplemental 

oxygen equipment is requested, the 
equipment must meet the requirements 
of this section and §§ 25.1443 through 

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