Cessna 172N Operating Handbook page 142

SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
CESSNA
MODEL 172N
and its associated NAV/COM receiver audio simultaneously with the trans-
mitter selector switch, If automatic audio selection is not desired, the
Auro
selector switch should be placed in the oFF (center) position.
AU DIO SE T ECI OR S W II CH E S
The audio selector switches, labeled NAv/coM
1, a and 3 and ADF
1 and 2, allow the pilot to initiaily pre-tune all NAv/iou
and ADF re-
_ceivers, and then individually select and listen to any receiver or com-
bination of receivers.
To listen to a specific receiver, first check that
the AUTO selector switch is in the OFF (center) positibn, then place the
audio selector switch corresponding to that receiver in either the SpEAKEp
(up) or PHONE (dourn) position.
To turn off the audio of the selected re-
ceiver, place that switch in the oFF (center) position.
If desired, the
audio selector switches can be positioned to-pbrmit the pilot to listen to
one receiver on a headset while the passengers listen to another receiver
on the airplane speaker.
The ADF 1 and 2 switches may be used anytime ADF audio is desired.
If the pilot wants only ADF audio, for station identiJication or other rea-
sotls' the AUTO selector switch (if in use) and all other audio selector
switches should be in the OFF position.
If simuttaneous ADF and NAV/
coM audio is acceptable to the pilot, no change in the existing switch
positions is required.
Place the ADF 1 or 2 switch in either Ine SpneKER
or PHoNE position and adjust radio volume as desired.
NOTE
rf the NAv/coM
audio selector switch corresponding to
the selected transmitter is in the pHoNE position with
the Allro
selector switch in the SPEAI(ER position, all
audio selector switches placed in the pHoNE position
will automatically be connected to both the airplane
speaker and any headsets in use.
MI C R O P HO N E -H E AD S E T
-
_The microphone-headset combination consists of the microphone and
headset combined in a single unit and a microphone keying switch located
on the left side of the pilotts control wheel. the micr-ophone-headset per-
mits the pilot to conduct radio communications withotrt internrpting otfier
control operations to handle a hand-held microphone. Also,
frssenge"s
need not listen to all communieations.
The mi-crophone and triaaset-jacks
are located near the lower left corner of the instrriment panel.
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