126 

14 CFR Ch. I (1–1–19 Edition) 

§ 121.337 

to communicate by interphone with 
each other while at their assigned duty 
stations. The equipment, while in use, 
must also allow crewmember inter-
phone 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 air-
plane 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 re-
quirements of this part provided it 
meets the oxygen equipment standards 
of § 121.335 of this part. 

(7) Protective breathing gas duration 

and supply system equipment require-
ments are as follows: 

(i) The equipment must supply 

breathing gas for 15 minutes at a pres-
sure altitude of 8,000 feet for the fol-
lowing: 

(A) Flight crewmembers while per-

forming 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 para-
graph (c) of this section, that the gas 
supply is fully charged. 

(iv) For each chemical oxygen gener-

ator, the supply system equipment 
must meet the requirements of § 25.1450 
(b) and (c) of this chapter. 

(8) 

Smoke and fume protection. 

Protec-

tive breathing equipment with a fixed 
or portable breathing gas supply meet-
ing 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 non-

transport category airplanes type cer-
tificated after December 31, 1964, pro-
tective 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 crew-
members in combatting fires as fol-
lows: 

(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 compart-
ment. 

(ii) One on the flight deck, except 

that the Administrator may authorize 
another location for this PBE if special 
circumstances exist that make compli-
ance impractical and the proposed de-
viation would provide an equivalent 
level of safety. 

(iii) In each passenger compartment, 

one for each hand fire extinguisher re-
quired by § 121.309 of this part, to be lo-
cated within 3 feet of each required 
hand fire extinguisher, except that the 
Administrator may authorize a devi-
ation allowing locations of PBE more 
than 3 feet from required hand fire ex-
tinguisher locations if special cir-
cumstances exist that make compli-
ance 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 uni-
versal-fit type), and is connected to 
supply terminals and that the breath-
ing gas supply and pressure are ade-
quate for use; and 

(ii) For chemical oxygen generator 

systems, is serviceable and fits prop-
erly (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 crew-
member to ensure that each is properly 
stowed and serviceable, and, for other 
than chemical oxygen generator sys-
tems, 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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