Cessna T182 1982 Pilot Operating Handbook page 220

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AUDIO CONTROL PANELS PILOT'S OPERATING HANDBOOK
, SUPPLEMENT
3. COM BOTH Selector Switch -- SELECT the same SPEAKER or
PHONE position which was set on the COM AUTO selector switch
to allow both COM receivers to be monitored at the same time.
NOTE
The combination of placing the COM AUTO switch in the
SPEAKER position and the COM BOTH switch in the
PHONE position (or vice versa) is not normally recom­
mended as it will cause audio from both communications
receivers (and any other navigation receiver with its audio
selector switch in the PHONE position) to be heard on both
the airplane speaker and the headset simultaneously.
4. Audio SPEAKER/PHONE Selector Switches -- SELECT desired
SPEAKER or PHONE audio position only if COM AUTO switch is
not used.
5. INT Control Knob -- ROTATE as desired to increase or decrease
intercom audio volume.
6. ANN LTS Switch:
a. TEST Position -- SELECT to verify operation of marker
beacon, BC and RN annunciator lights (when installed).
b. DAY Position -- SELECT for typical daytime lighting.
c. NITE Position -- SELECT for typical night lighting.
NOTE
In the NITE position, further lighting adjustment for the
Mkr Ben, BC and RN (when installed)annunciator lights
can be obtained using the RADIO LT dimming rheostat
knob.
SECTION 5
PERFORMANCE
There is no change to the airplane performance when either of these
audio control panels is installed.
21 August 1981
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