361 

Federal Aviation Administration, DOT 

§ 25.1457 

equipment must have the oxygen dis-
pensing unit connected to the portable 
oxygen supply. 

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as 
amended by Amdt. 25–41, 42 FR 36971, July 18, 
1977; Amdt. 25–87, 61 FR 28696, June 5, 1996; 
Amdt. 25–116, 69 FR 62789, Oct. 27, 2004] 

§ 25.1449

Means for determining use of 

oxygen. 

There must be a means to allow the 

crew to determine whether oxygen is 
being delivered to the dispensing equip-
ment. 

§ 25.1450

Chemical oxygen generators. 

(a) For the purpose of this section, a 

chemical oxygen generator is defined 
as a device which produces oxygen by 
chemical reaction. 

(b) Each chemical oxygen generator 

must be designed and installed in ac-
cordance with the following require-
ments: 

(1) Surface temperature developed by 

the generator during operation may 
not create a hazard to the airplane or 
to its occupants. 

(2) Means must be provided to relieve 

any internal pressure that may be haz-
ardous. 

(3) Except as provided in SFAR 109, 

each chemical oxygen generator instal-
lation must meet the requirements of 
§ 25.795(d). 

(c) In addition to meeting the re-

quirements in paragraph (b) of this sec-
tion, each portable chemical oxygen 
generator that is capable of sustained 
operation by successive replacement of 
a generator element must be placarded 
to show— 

(1) The rate of oxygen flow, in liters 

per minute; 

(2) The duration of oxygen flow, in 

minutes, for the replaceable generator 
element; and 

(3) A warning that the replaceable 

generator element may be hot, unless 
the element construction is such that 
the surface temperature cannot exceed 
100 degrees F. 

[Amdt. 25–41, 42 FR 36971, July 18, 1977, as 
amended at 79 FR 13519, Mar. 11, 2014] 

§ 25.1453

Protection of oxygen equip-

ment from rupture. 

Oxygen pressure tanks, and lines be-

tween tanks and the shutoff means, 
must be— 

(a) Protected from unsafe tempera-

tures; and 

(b) Located where the probability and 

hazards of rupture in a crash landing 
are minimized. 

§ 25.1455

Draining of fluids subject to 

freezing. 

If fluids subject to freezing may be 

drained overboard in flight or during 
ground operation, the drains must be 
designed and located to prevent the 
formation of hazardous quantities of 
ice on the airplane as a result of the 
drainage. 

[Amdt. 25–23, 35 FR 5680, Apr. 8, 1970] 

§ 25.1457

Cockpit voice recorders. 

(a) Each cockpit voice recorder re-

quired by the operating rules of this 
chapter must be approved and must be 
installed so that it will record the fol-
lowing: 

(1) Voice communications trans-

mitted from or received in the airplane 
by radio. 

(2) Voice communications of flight 

crewmembers on the flight deck. 

(3) Voice communications of flight 

crewmembers on the flight deck, using 
the airplane’s interphone system. 

(4) Voice or audio signals identifying 

navigation or approach aids introduced 
into a headset or speaker. 

(5) Voice communications of flight 

crewmembers using the passenger loud-
speaker system, if there is such a sys-
tem and if the fourth channel is avail-
able in accordance with the require-
ments of paragraph (c)(4)(ii) of this sec-
tion. 

(6) If datalink communication equip-

ment is installed, all datalink commu-
nications, using an approved data mes-
sage set. Datalink messages must be 
recorded as the output signal from the 
communications unit that translates 
the signal into usable data. 

(b) The recording requirements of 

paragraph (a)(2) of this section must be 
met by installing a cockpit-mounted 
area microphone, located in the best 

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