Federal Aviation Administration, DOT

Section 25.1457

equipment must have the oxygen dispensing 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]

Section 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 equipment.
Section 25.1450

Chemical oxygen generators.

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(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 accordance with the following requirements:
(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 hazardous.
(3) Except as provided in SFAR 109,
each chemical oxygen generator installation must meet the requirements of
Section 25.795(d).
(c) In addition to meeting the requirements in paragraph (b) of this section, 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]

Section 25.1453 Protection of oxygen equipment from rupture.
Oxygen pressure tanks, and lines between tanks and the shutoff means,
must be - 
(a) Protected from unsafe temperatures; and
(b) Located where the probability and
hazards of rupture in a crash landing
are minimized.
Section 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]

Section 25.1457

Cockpit voice recorders.

(a) Each cockpit voice recorder required by the operating rules of this
chapter must be approved and must be
installed so that it will record the following:
(1) Voice communications transmitted 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 loudspeaker system, if there is such a system and if the fourth channel is available in accordance with the requirements of paragraph (c)(4)(ii) of this section.
(6) If datalink communication equipment is installed, all datalink communications, using an approved data message 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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