177 

Federal Aviation Administration, DOT 

§ 23.1457 

Subpart F—Equipment 

23.2500

Airplane level systems require-

ments. 

23.2505

Function and installation. 

23.2510

Equipment, systems, and installa-

tions. 

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 mark-

ings, and placards. 

23.2615

Flight, navigation, and powerplant 

instruments. 

23.2620

Airplane flight manual. 

A

PPENDIX

A 

TO

P

ART

23—I

NSTRUCTIONS FOR

 

C

ONTINUED

A

IRWORTHINESS

 

A

UTHORITY

: 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. 

S

OURCE

: Doc. No. FAA–2015–1621, Amdt. 23– 

64, 81 FR 96689, Dec. 30, 2016, unless otherwise 
noted. 

§ 23.1457

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 

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 pas-
senger loudspeaker system, if there is 
such a system and if the fourth channel 
is available in accordance with the re-
quirements of paragraph (c)(4)(ii) of 
this section. 

(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 
position for recording voice commu-
nications originating at the first and 
second pilot stations and voice commu-
nications of other crewmembers on the 
flight deck when directed to those sta-
tions. The microphone must be so lo-
cated and, if necessary, the pre-
amplifiers and filters of the recorder 
must be so adjusted or supplemented, 
so that the intelligibility of the re-
corded communications is as high as 
practicable when recorded under flight 
cockpit noise conditions and played 
back. Repeated aural or visual play-
back of the record may be used in eval-
uating intelligibility. 

(c) Each cockpit voice recorder must 

be installed so that the part of the 
communication or audio signals speci-
fied in paragraph (a) of this section ob-
tained from each of the following 
sources is recorded on a separate chan-
nel: 

(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 para-

graph (c)(4)(i) of this section are not re-
quired 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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