spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 27.1457

installed so that it will record the following:
(1) Voice communications transmitted from or received in the rotorcraft by radio.
(2) Voice communications of flight
crewmembers on the flight deck.
(3) Voice communications of flight
crewmembers on the flight deck, using
the rotorcraft-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 may be
met:
(1) 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; or
(2) By installing a continually energized or voice-actuated lip microphone
at the first and second pilot stations.
The microphone specified in this
paragraph must be so located and, if
necessary, the preamplifiers and filters
of the recorder must be adjusted or
supplemented so that the recorded
communications are intelligible when
recorded under flight cockpit noise
conditions and played back. The level
of intelligibility must be approved by
the Administrator. 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
microphone, headset, or speaker used
at the first pilot station.
(2) For the second channel, from each
microphone, headset, or speaker used
at the second pilot station.
(3) For the third channel, from the
cockpit-mounted area microphone, or
the continually energized or voice-actuated lip microphone at the first and
second pilot stations.
(4) For the fourth channel, from:
(i) Each microphone, headset, or
speaker used at the stations for the
third and fourth crewmembers; or
(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.
(iii) Each microphone on the flight
deck that is used with the rotorcraft-s
loudspeaker system if its signals are
not picked up by another channel.
(d) Each cockpit voice recorder must
be installed so that:
(1)(i) It receives its electrical power
from the bus that provides the maximum reliability for operation of the
cockpit voice recorder without jeopardizing service to essential or emergency
loads.
(ii) It remains powered for as long as
possible without jeopardizing emergency operation of the rotorcraft.
(2) There is an automatic means to
simultaneously stop the recorder and
prevent each erasure feature from functioning, within 10 minutes after crash
impact;
(3) There is an aural or visual means
for preflight checking of the recorder
for proper operation;
(4) Whether the cockpit voice recorder and digital flight data recorder
are installed in separate boxes or in a
combination unit, no single electrical
failure external to the recorder may
disable both the cockpit voice recorder
and the digital flight data recorder;
and
(5) It has an independent power
source - 

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