124 

14 CFR Ch. I (1–1–19 Edition) 

§ 121.333 

placed on his face from its ready posi-
tion, properly secured, sealed, and sup-
plying oxygen upon demand; and so de-
signed that after being placed on the 
face it does not prevent immediate 
communication between the flight 
crewmember and other crewmembers 
over the airplane intercommunication 
system. When it is not being used at 
flight altitudes above flight level 250, 
the oxygen mask must be kept in con-
dition for ready use and located so as 
to be within the immediate reach of 
the flight crewmember while at his 
duty station. 

(2) When operating at flight altitudes 

above flight level 250, one pilot at the 
controls of the airplane shall at all 
times wear and use an oxygen mask se-
cured, sealed, and supplying oxygen, in 
accordance with the following: 

(i) The one pilot need not wear and 

use an oxygen mask at or below the 
following flight levels if each flight 
crewmember on flight deck duty has a 
quick-donning type of oxygen mask 
that the certificate holder has shown 
can be placed on the face from its 
ready position, properly secured, 
sealed, and supplying oxygen upon de-
mand, with one hand and within five 
seconds: 

(A) For airplanes having a passenger 

seat configuration of more than 30 
seats, excluding any required crew-
member seat, or a payload capacity of 
more than 7,500 pounds, at or below 
flight level 410. 

(B) For airplanes having a passenger 

seat configuration of less than 31 seats, 
excluding any required crewmember 
seat, and a payload capacity of 7,500 
pounds or less, at or below flight level 
350. 

(ii) Whenever a quick-donning type of 

oxygen mask is to be used under this 
section, the certificate holder shall 
also show that the mask can be put on 
without disturbing eye glasses and 
without delaying the flight crew-
member from proceeding with his as-
signed emergency duties. The oxygen 
mask after being put on must not pre-
vent immediate communication be-
tween the flight crewmember and other 
crewmembers over the airplane inter-
communication system. 

(3) Notwithstanding paragraph (c)(2) 

of this section, if for any reason at any 

time it is necessary for one pilot to 
leave his station at the controls of the 
airplane when operating at flight alti-
tudes above flight level 250, the re-
maining pilot at the controls shall put 
on and use his oxygen mask until the 
other pilot has returned to his duty 
station. 

(4) Before the takeoff of a flight, each 

flight crewmember shall personally 
preflight his oxygen equipment to in-
sure that the oxygen mask is func-
tioning, fitted properly, and connected 
to appropriate supply terminals, and 
that the oxygen supply and pressure 
are adequate for use. 

(d) 

Use of portable oxygen equipment by 

cabin attendants. 

After November 28, 

2005 each mask used for portable oxy-
gen equipment must be connected to 
its oxygen supply. Above flight level 
250, one of the following is required: 

(1) Each attendant shall carry port-

able oxygen equipment with a 15 
minute supply of oxygen; or 

(2) There must be sufficient portable 

oxygen equipment (including masks 
and spare outlets) distributed through-
out the cabin so that such equipment is 
immediately available to each attend-
ant, regardless of their location in the 
cabin; or 

(3) There are sufficient spare outlets 

and masks distributed throughout the 
cabin to ensure immediate availability 
of oxygen to each cabin attendant, re-
gardless of their location in the cabin. 

(e) 

Passenger cabin occupants. 

When 

the airplane is operating at flight alti-
tudes above 10,000 feet, the following 
supply of oxygen must be provided for 
the use of passenger cabin occupants: 

(1) When an airplane certificated to 

operate at flight altitudes up to and in-
cluding flight level 250, can at any 
point along the route to be flown, de-
scend safely to a flight altitude of 
14,000 feet or less within four minutes, 
oxygen must be available at the rate 
prescribed by this part for a 30-minute 
period for at least 10 percent of the pas-
senger cabin occupants. 

(2) When an airplane is operated at 

flight altitudes up to and including 
flight level 250 and cannot descend 
safely to a flight altitude of 14,000 feet 
within four minutes, or when an air-
plane is operated at flight altitudes 
above flight level 250, oxygen must be 

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