Federal Aviation Administration, DOT

Section 23.1457

Subpart F - Equipment
23.2500 Airplane level systems requirements.
23.2505 Function and installation.
23.2510 Equipment, systems, and installations.
23.2515 Electrical and electronic system
lightning protection.
23.2520 High-intensity
Radiated
Fields
(HIRF) protection.
23.2525 System power generation, storage,
and distribution.
23.2530 External and cockpit lighting.
23.2535 Safety equipment.
23.2540 Flight in icing conditions.
23.2545 Pressurized system elements.
23.2550 Equipment containing high-energy
rotors.

Subpart G - Flightcrew Interface and Other
Information
23.2600 Flightcrew interface.
23.2605 Installation and operation.
23.2610 Instrument markings, control markings, and placards.
23.2615 Flight, navigation, and powerplant
instruments.
23.2620 Airplane flight manual.
APPENDIX A TO PART 23 - INSTRUCTIONS FOR
CONTINUED AIRWORTHINESS
AUTHORITY: 49 U.S.C. 106(f), 106(g), 40113,
44701-44702, 44704, Pub. L. 113-53, 127 Stat. 584
(49 U.S.C. 44704) note.

spaschal on DSK3GDR082PROD with CFR

SOURCE: Doc. No. FAA-2015-1621, Amdt. 23-
64, 81 FR 96689, Dec. 30, 2016, unless otherwise
noted.

Section 23.1457 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
flightcrew members on the flight deck.
(3)
Voice
communications
of
flightcrew members 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
flightcrew members 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
position for recording voice communications originating at the first and
second pilot stations and voice communications of other crewmembers on the
flight deck when directed to those stations. The microphone must be so located and, if necessary, the preamplifiers and filters of the recorder
must be so adjusted or supplemented,
so that the intelligibility of the recorded communications is as high as
practicable when recorded under flight
cockpit noise conditions and played
back. Repeated aural or visual playback of the record may be used in evaluating intelligibility.
(c) Each cockpit voice recorder must
be installed so that the part of the
communication or audio signals specified in paragraph (a) of this section obtained from each of the following
sources is recorded on a separate channel:
(1) For the first channel, from each
boom, mask, or handheld microphone,
headset, or speaker used at the first
pilot station.
(2) For the second channel from each
boom, mask, or handheld microphone,
headset, or speaker used at the second
pilot station.
(3) For the third channel - from the
cockpit-mounted area microphone.
(4) For the fourth channel from:
(i) Each boom, mask, or handheld
microphone, headset, or speaker used
at the station for the third and fourth
crewmembers.
(ii) If the stations specified in paragraph (c)(4)(i) of this section are not required or if the signal at such a station
is picked up by another channel, each
microphone on the flight deck that is
used with the passenger loudspeaker
system, if its signals are not picked up
by another channel.
(5) And that as far as is practicable
all sounds received by the microphone

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