CESSNA
MODEL 172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
20
-
FAA APPROVED
SUPPLEMENT
BENDIX/KING KMA
28
AUDIO SELECTOR
PANEL
SECTION
1
GENERAL
The Bendix/King
KMA
28
Audio
Selector
Panel is
a
combination
audio selector panel, cabin intercom, audio
amplifier
and
marker
beacon receiver.
The
audio amplifier powers the cockpit overhead
speaker
when
selected.
Receiver audio is
selected using ten back-lit pushbutton
switches.
Selected
receivers
can
be
identified
by
the
illuminated
green
LED
on
the
appropriate switch pushbutton.
The
rotary
microphone
selector
switch
automatically supplies the audio for the
transceiver selected; The Com
1
and Com
2
switches permit the
user
to
monitor
or
"guard" the audio from the other transceiver.
All
operating controls are shown and described
in
Figure
1.
An unamplified and unswitched
stereo
audio input is provided
for
an
entertainment audio
source
{Walkman
or
similar Portable
Electronic Device (PED)). The Entertainment audio input is located
on
the lower
half of
the cockpit
center
pedestal; the
3.5
mm
stereo
jack
is
labeled "AUX
AUDIO
IN".
The KMA
28
includes the Soft
Mute
feature
that lowers the audio level of the entertainment signal
whenever radio or intercom audio is
present.
Refer
to 14
CFR Part
91.21 and Advisory
Circular
No. 91.21-1()
“Use
of
Portable
Electronic
Devices Aboard Aircraft0 for further information and
requirements
regarding the
use
of
portable
electronic devices in
aircraft.
The cabin intercom uses the Intellivox™ automatic squelch
circuit
to
minimize non-voice
signals.
The intercom audio
level is set
using
the
front-mounted
intercom volume control;
audio
levels for
the
receivers and entertainment are controlled
at
the
source.
Dec
30/00
S20-3
Summary of Contents for 172R
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