Section 121.333

14 CFR Ch. I (1-1-19 Edition)

placed on his face from its ready position, properly secured, sealed, and supplying oxygen upon demand; and so designed 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 condition 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 secured, 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 demand, with one hand and within five
seconds:
(A) For airplanes having a passenger
seat configuration of more than 30
seats, excluding any required crewmember 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 crewmember from proceeding with his assigned emergency duties. The oxygen
mask after being put on must not prevent immediate communication between the flight crewmember and other
crewmembers over the airplane intercommunication 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 altitudes above flight level 250, the remaining 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 insure that the oxygen mask is functioning, 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 oxygen equipment must be connected to
its oxygen supply. Above flight level
250, one of the following is required:
(1) Each attendant shall carry portable oxygen equipment with a 15
minute supply of oxygen; or
(2) There must be sufficient portable
oxygen equipment (including masks
and spare outlets) distributed throughout the cabin so that such equipment is
immediately available to each attendant, 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, regardless of their location in the cabin.
(e) Passenger cabin occupants. When
the airplane is operating at flight altitudes 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 including flight level 250, can at any
point along the route to be flown, descend 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 passenger 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 airplane is operated at flight altitudes
above flight level 250, oxygen must be

124

VerDate Sep<11>2014

08:20 May 17, 2019

Jkt 247048

PO 00000

Frm 00134

Fmt 8010

Sfmt 8010

Y:\SGML\247048.XXX

247048