Textron Cessna 172R - Page 489

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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