361 

Federal Aviation Administration, DOT 

§ 25.1447 

(e) If portable oxygen equipment is 

installed for use by crewmembers, the 
minimum mass flow of supplemental 
oxygen is the same as specified in para-
graph (a) or (b) of this section, which-
ever is applicable. 

§ 25.1445

Equipment standards for the 

oxygen distributing system. 

(a) When oxygen is supplied to both 

crew and passengers, the distribution 
system must be designed for either— 

(1) A source of supply for the flight 

crew on duty and a separate source for 
the passengers and other crewmembers; 
or 

(2) A common source of supply with 

means to separately reserve the min-
imum supply required by the flight 
crew on duty. 

(b) Portable walk-around oxygen 

units of the continuous flow, diluter- 
demand, and straight demand kinds 
may be used to meet the crew or pas-
senger breathing requirements. 

§ 25.1447

Equipment standards for ox-

ygen dispensing units. 

If oxygen dispensing units are in-

stalled, the following apply: 

(a) There must be an individual dis-

pensing unit for each occupant for 
whom supplemental oxygen is to be 
supplied. Units must be designed to 
cover the nose and mouth and must be 
equipped with a suitable means to re-
tain the unit in position on the face. 
Flight crew masks for supplemental 
oxygen must have provisions for the 
use of communication equipment. 

(b) If certification for operation up to 

and including 25,000 feet is requested, 
an oxygen supply terminal and unit of 
oxygen dispensing equipment for the 
immediate use of oxygen by each crew-
member must be within easy reach of 
that crewmember. For any other occu-
pants, the supply terminals and dis-
pensing equipment must be located to 
allow the use of oxygen as required by 
the operating rules in this chapter. 

(c) If certification for operation 

above 25,000 feet is requested, there 
must be oxygen dispensing equipment 
meeting the following requirements: 

(1) There must be an oxygen dis-

pensing unit connected to oxygen sup-
ply terminals immediately available to 
each occupant wherever seated, and at 

least two oxygen dispensing units con-
nected to oxygen terminals in each lav-
atory. The total number of dispensing 
units and outlets in the cabin must ex-
ceed the number of seats by at least 10 
percent. The extra units must be as 
uniformly distributed throughout the 
cabin as practicable. Except as pro-
vided in paragraph (c)(5) of this sec-
tion, if certification for operation 
above 30,000 feet is requested, the dis-
pensing units providing the required 
oxygen flow must be automatically 
presented to the occupants before the 
cabin pressure altitude exceeds 15,000 
feet. The crewmembers must be pro-
vided with a manual means of making 
the dispensing units immediately 
available in the event of failure of the 
automatic system. 

(2) Each flight crewmember on flight 

deck duty must be provided with a 
quick-donning type oxygen dispensing 
unit connected to an oxygen supply 
terminal. This dispensing unit must be 
immediately available to the flight 
crewmember when seated at his sta-
tion, and installed so that it: 

(i) Can be placed on the face from its 

ready position, properly secured, 
sealed, and supplying oxygen upon de-
mand, with one hand, within five sec-
onds and without disturbing eyeglasses 
or causing delay in proceeding with 
emergency duties; and 

(ii) Allows, while in place, the per-

formance of normal communication 
functions. 

(3) The oxygen dispensing equipment 

for the flight crewmembers must be: 

(i) The diluter demand or pressure de-

mand (pressure demand mask with a 
diluter demand pressure breathing reg-
ulator) type, or other approved oxygen 
equipment shown to provide the same 
degree of protection, for airplanes to be 
operated above 25,000 feet. 

(ii) The pressure demand (pressure 

demand mask with a diluter demand 
pressure breathing regulator) type with 
mask-mounted regulator, or other ap-
proved oxygen equipment shown to 
provide the same degree of protection, 
for airplanes operated at altitudes 
where decompressions that are not ex-
tremely improbable may expose the 
flightcrew to cabin pressure altitudes 
in excess of 34,000 feet. 

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