Code of Federal Regulations - Title 14

517

Federal Aviation Administration, DOT

§ 25.1457

pressure breathing regulator) type with
mask-mounted regulator, or other ap-
proved oxygen equipment shown to
provide the same degree of protection,
for airplanes operated at altitudes
where decompressions that are not ex-
tremely improbable may expose the
flightcrew to cabin pressure altitudes
in excess of 34,000 feet.

(4) Portable oxygen equipment must

be immediately available for each
cabin attendant. The portable oxygen
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.

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]

§ 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.

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