CESSNA
MODEL 172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
20
-
FAA APPROVED
11.
VOLUME
CONTROL/POWER
SWITCH/EMERGENCY
OPERATION
KNOB
-
The KMA
28
unit
is turned
on and off by pushing
the volume
knob.
In
the OFF
or
EMG
(Emergency)
position,
the pilot
is
connected
directly to
Com
1. This allows
communication capability
regardless
of
unit
condition.
Any
time
power
is removed
or turned off, the
audio
selector
will
be
placed in
the emergency
mode.
The power
switch also
controls the audio
selector panel functions, intercom,
and marker
beacon receiver. Unless the
mic
selector
is
in Com
3 mode, at
least
one of the selected audio
LED's will
be
on
(Com 1
or
Com
2).
Turn
the
outer
area
of
the knob
to
adjust
the loudness of the intercom for
the
pilot
and
copilot
only.
It has
no effect on selected radio
levels,
music
input
levels
or
passenger's
volume
level. Adjust the radios and
intercom volume for
a
comfortable
listening
level
for the pilot.
Passenger
volume
can be adjusted at the
headset.
All
passenger
headsets
are
connected
in
parallel.
Therefore,
if
a
monaural
headset
is plugged
into
a
stereo
KMA
28
installation,
one channel will be
shorted.
Although
no damage
to
the unit
will
occur, all
passengers will
lose
one channel.
NOTE
During
KMA
28
operation
in the
OFF
or
EMG
position, the
audio
is
disabled
preventing installed
system
alerts
(autopilot disconnect tone) from being heard. The marker
beacon
receiver audio and annunciator lights will be
inoperative.
Figure 1
.
Bendix/King
KMA
28
Audio
Selector
Panel (Sheet
5
of
5)
Dec
30/00
S20-9
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