Section 121.337

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

to communicate by interphone with
each other while at their assigned duty
stations. The equipment, while in use,
must also allow crewmember interphone communications between each of
two flight crewmember stations in the
pilot compartment and at least one
normal flight attendant station in each
passenger compartment.
(5) The equipment, while in use, must
allow any crewmember to use the airplane interphone system at any of the
flight attendant stations referred to in
paragraph (b)(4) of this section.
(6) The equipment may also be used
to meet the supplemental oxygen requirements of this part provided it
meets the oxygen equipment standards
of Section 121.335 of this part.
(7) Protective breathing gas duration
and supply system equipment requirements are as follows:
(i) The equipment must supply
breathing gas for 15 minutes at a pressure altitude of 8,000 feet for the following:
(A) Flight crewmembers while performing flight deck duties; and
(B) Crewmembers while combatting
an in-flight fire.
(ii) The breathing gas system must
be free from hazards in itself, in its
method of operation, and in its effect
upon other components.
(iii) For breathing gas systems other
than chemical oxygen generators,
there must be a means to allow the
crew to readily determine, during the
equipment preflight described in paragraph (c) of this section, that the gas
supply is fully charged.
(iv) For each chemical oxygen generator, the supply system equipment
must meet the requirements of Section 25.1450
(b) and (c) of this chapter.
(8) Smoke and fume protection. Protective breathing equipment with a fixed
or portable breathing gas supply meeting the requirements of this section
must be conveniently located on the
flight deck and be easily accessible for
immediate use by each required flight
crewmember at his or her assigned
duty station.
(9) Fire combatting. Except for nontransport category airplanes type certificated after December 31, 1964, protective breathing equipment with a
portable breathing gas supply meeting

the requirements of this section must
be easily accessible and conveniently
located for immediate use by crewmembers in combatting fires as follows:
(i) One PBE is required for each hand
fire extinguisher located for use in a
galley other than a galley located in a
passenger, cargo, or crew compartment.
(ii) One on the flight deck, except
that the Administrator may authorize
another location for this PBE if special
circumstances exist that make compliance impractical and the proposed deviation would provide an equivalent
level of safety.
(iii) In each passenger compartment,
one for each hand fire extinguisher required by Section 121.309 of this part, to be located within 3 feet of each required
hand fire extinguisher, except that the
Administrator may authorize a deviation allowing locations of PBE more
than 3 feet from required hand fire extinguisher locations if special circumstances exist that make compliance impractical and if the proposed
deviation provides an equivalent level
of safety.
(c) Equipment preflight. (1) Before
each flight, each item of PBE at flight
crewmember duty stations must be
checked by the flight crewmember who
will use the equipment to ensure that
the equipment - 
(i) For other than chemical oxygen
generator systems, is functioning, is
serviceable, fits properly (unless a universal-fit type), and is connected to
supply terminals and that the breathing gas supply and pressure are adequate for use; and
(ii) For chemical oxygen generator
systems, is serviceable and fits properly (unless a universal-fit type).
(2) Each item of PBE located at other
than a flight crewmember duty station
must be checked by a designated crewmember to ensure that each is properly
stowed and serviceable, and, for other
than chemical oxygen generator systems, the breathing gas supply is fully
charged. Each certificate holder, in its
operations manual, must designate at
least one crewmember to perform those
checks before he or she takes off in

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