Federal Aviation Administration, DOT

Section 121.337

available at the rate prescribed by this
part for not less than 10 percent of the
passenger cabin occupants for the entire flight after cabin depressurization,
at cabin pressure altitudes above 10,000
feet up to and including 14,000 feet and,
as applicable, to allow compliance with
Section 121.329(c) (2) and (3), except that there
must be not less than a 10-minute supply for the passenger cabin occupants.
(3) For first-aid treatment of occupants who for physiological reasons
might require undiluted oxygen following descent from cabin pressure altitudes above flight level 250, a supply
of oxygen in accordance with the requirements of Section 25.1443(d) must be provided for two percent of the occupants
for the entire flight after cabin depressurization at cabin pressure altitudes
above 8,000 feet, but in no case to less
than one person. An appropriate number of acceptable dispensing units, but
in no case less than two, must be provided, with a means for the cabin attendants to use this supply.
(f) Passenger briefing. Before flight is
conducted above flight level 250, a
crewmember shall instruct the passengers on the necessity of using oxygen in the event of cabin depressurization and shall point out to them the location and demonstrate the use of the
oxygen-dispensing equipment.
[Doc. No. 6258, 29 FR 19205, Dec. 31, 1964, as
amended by Amdt. 121-11, 30 FR 12466, Sept.
30, 1965; Amdt. 121-132, 41 FR 55475, Dec. 20,
1976; Amdt. 121-262, 62 FR 13256, Mar. 19, 1997;
62 FR 15570, Apr. 1, 1997; Amdt. 121-306, 69 FR
62789, Oct. 27, 2004]

Section 121.335 Equipment standards.
(a) Reciprocating engine powered airplanes. The oxygen apparatus, the minimum rates of oxygen flow, and the
supply of oxygen necessary to comply
with Section 121.327 must meet the standards
established in section 4b.651 of the Civil
Air Regulations as in effect on July 20,
1950, except that if the certificate holder shows full compliance with those
standards to be impracticable, the Administrator may authorize any change
in those standards that he finds will
provide an equivalent level of safety.
(b) Turbine engine powered airplanes.
The oxygen apparatus, the minimum
rate of oxygen flow, and the supply of
oxygen necessary to comply with

SectionSection 121.329 and 121.333 must meet the
standards established in section 4b.651
of the Civil Air Regulations as in effect
on September 1, 1958, except that if the
certificate holder shows full compliance with those standards to be impracticable, the Administrator may authorize any changes in those standards
that he finds will provide an equivalent
level of safety.
Section 121.337 Protective breathing equipment.
(a) The certificate holder shall furnish approved protective breathing
equipment (PBE) meeting the equipment, breathing gas, and communication requirements contained in paragraph (b) of this section.
(b) Pressurized and nonpressurized
cabin airplanes. Except as provided in
paragraph (f) of this section, no person
may operate an airplane unless protective breathing equipment meeting the
requirements of this section is provided
as follows:
(1) General. The equipment must protect the flightcrew from the effects of
smoke, carbon dioxide or other harmful
gases or an oxygen deficient environment caused by other than an airplane
depressurization while on flight deck
duty and must protect crewmembers
from the above effects while combatting fires on board the airplane.
(2) The equipment must be inspected
regularly in accordance with inspection guidelines and the inspection periods established by the equipment manufacturer to ensure its condition for
continued serviceability and immediate readiness to perform its intended
emergency purposes. The inspection periods may be changed upon a showing
by the certificate holder that the
changes would provide an equivalent
level of safety.
(3) That part of the equipment protecting the eyes must not impair the
wearer-s vision to the extent that a
crewmember-s duties cannot be accomplished and must allow corrective
glasses to be worn without impairment
of vision or loss of the protection required by paragraph (b)(1) of this section.
(4) The equipment, while in use, must
allow the flightcrew to communicate
using the airplane radio equipment and

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