Cessna 172P Pilot's Operating Handbook And Flight Manual page 252

is installed, audio
is
selected by tho
COM AUTO AUDIO
SELECTOR S\I¡ITCH
The audio control panel used
with either
one
or two
transmÍtters
incorporates
a
three-position t
provided
to
automatically mat
communications recelver
to
th
switch.
COM BOTH AUDIO
SELECTOR,
S\ryITCH
The audio oontrol panel
ueod
with
either
one
or two
transmitters
incorporates
a
threo-position toggle switch,
tabeled
coM BorH,
which is
provided to allow both
coM
receivers to
be
monitored at the
same time.
AUTO AUDIO
SELECTOR S\ryITCH
9
AUDIO
CONTROL PANELS
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
The audio control panel
used
with
three transmitters incorporates
a
three-position toggle switch,
Iabeled AUTO, which
is
provided
to
automat-
ically
match the audio
of the
appropriate NAV/COM receiver to
the
selected
transmitter.
ANNUNCTATOII LIGHTS
BR,IGHTNESS
AND TEST
S\ryITCH
The audio control panel
used
with
either
one
or two
transmitters
incorporates
a
three-position toggle switch
with
NITE (up) and DAY
(middle) positions
to control
the brightness level of the marker
beacon
indicator tights,
and
the
BC
andRN Nav indicator lights
(when
installed).
In
the TEST (down)
position, all annunciator tights (Mkr
Bon,
BC and
RN)
will
illuminate
full
bright
to
verify Iighting
test.
NOTE
A
potentiometer
is
installed inside
the audio
control panel
to provide further minimum
light
dimming capabilities.
Refer to the appropriate AvÍonics Service/Parts manual
for adjustment procodures.
2
30
May
1980