title-14-part-25-sec25-1447

361

Federal Aviation Administration, DOT

§ 25.1447

(e) If portable oxygen equipment is

installed for use by crewmembers, the
minimum mass flow of supplemental
oxygen is the same as specified in para-
graph (a) or (b) of this section, which-
ever is applicable.

§ 25.1445

Equipment standards for the

oxygen distributing system.

(a) When oxygen is supplied to both

crew and passengers, the distribution
system must be designed for either—

(1) A source of supply for the flight

crew on duty and a separate source for
the passengers and other crewmembers;
or

(2) A common source of supply with

means to separately reserve the min-
imum supply required by the flight
crew on duty.

(b) Portable walk-around oxygen

units of the continuous flow, diluter-
demand, and straight demand kinds
may be used to meet the crew or pas-
senger breathing requirements.

§ 25.1447

Equipment standards for ox-

ygen dispensing units.

If oxygen dispensing units are in-

stalled, the following apply:

(a) There must be an individual dis-

pensing unit for each occupant for
whom supplemental oxygen is to be
supplied. Units must be designed to
cover the nose and mouth and must be
equipped with a suitable means to re-
tain the unit in position on the face.
Flight crew masks for supplemental
oxygen must have provisions for the
use of communication equipment.

(b) If certification for operation up to

and including 25,000 feet is requested,
an oxygen supply terminal and unit of
oxygen dispensing equipment for the
immediate use of oxygen by each crew-
member must be within easy reach of
that crewmember. For any other occu-
pants, the supply terminals and dis-
pensing equipment must be located to
allow the use of oxygen as required by
the operating rules in this chapter.

above 25,000 feet is requested, there
must be oxygen dispensing equipment
meeting the following requirements:

(1) There must be an oxygen dis-

pensing unit connected to oxygen sup-
ply terminals immediately available to
each occupant wherever seated, and at

least two oxygen dispensing units con-
nected to oxygen terminals in each lav-
atory. The total number of dispensing
units and outlets in the cabin must ex-
ceed the number of seats by at least 10
percent. The extra units must be as
uniformly distributed throughout the
cabin as practicable. Except as pro-
vided in paragraph (c)(5) of this sec-
tion, if certification for operation
above 30,000 feet is requested, the dis-
pensing units providing the required
oxygen flow must be automatically
presented to the occupants before the
cabin pressure altitude exceeds 15,000
feet. The crewmembers must be pro-
vided with a manual means of making
the dispensing units immediately
available in the event of failure of the
automatic system.

(2) Each flight crewmember on flight

deck duty must be provided with a
quick-donning type oxygen dispensing
unit connected to an oxygen supply
terminal. This dispensing unit must be
immediately available to the flight
crewmember when seated at his sta-
tion, and installed so that it:

(i) Can be placed on the face from its

ready position, properly secured,
sealed, and supplying oxygen upon de-
mand, with one hand, within five sec-
onds and without disturbing eyeglasses
or causing delay in proceeding with
emergency duties; and

(ii) Allows, while in place, the per-

formance of normal communication
functions.

(3) The oxygen dispensing equipment

for the flight crewmembers must be:

(i) The diluter demand or pressure de-

mand (pressure demand mask with a
diluter demand pressure breathing reg-
ulator) type, or other approved oxygen
equipment shown to provide the same
degree of protection, for airplanes to be
operated above 25,000 feet.

(ii) The pressure demand (pressure

demand mask with a diluter demand
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.

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362

14 CFR Ch. I (1–1–24 Edition)

§ 25.1449

(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.

(5) When operating into or out of air-

ports with elevations above 13,000 feet,
the dispensing units providing the re-
quired oxygen flow must be automati-
cally presented to the occupants at
cabin pressure altitudes no higher than
2,000 feet above the airplane’s max-
imum takeoff and landing altitude.

[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; Amdt.
No. 25–151, 88 FR 39161, June 15, 2023; 88 FR
44032, July 11, 2023]

§ 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).

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.