Textron Cessna 172R - Page 483

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
All manuals and user guides at all-guides.com