SECTION 7
AIRPLANE AND
SYSTEMS DESCRIPTION
CESSNA
MODEL 172S NAV
III
AVIONICS SUPPORT EQUIPMENT (Continued)
MICROPHONE AND HEADSET INSTALLATIONS (Continued)
Each control
wheel contains a push-to-talk switch. This switch
allows the pilot or front passenger to transmit
on
the COM radios
using remote mics.
Each
seat position
of
the airplane has provisions for aviation-style
t"leadsets. Microphone and head phone jacks are located
on
each
tespective
sidewall panel for communications between passengers
and
pilot. The system
is
designed so all microphones are voice-
activated.
Only the pilot or front passenger can transmit through the
COM radios.
NOTE
To
ensure audibility and clarity when transmitting
with the handheld microphone, always
hold it as
closely as possible to the lips, then press the
transmit switch and speak directly into
it.
Avoid
covering the opening
on
back side of microphone for
optimum noise
canceling.
AUXILIARY AUDIO INPUT JACK
An
auxiliary audio input jack (AUX AUDIO IN) is located
on
the
center pedestal (refer to Figure 7-2).
It
allows entertainment audio
devices such
as
cassette players and compact disc players
to
play
music over the aircraft's headsets.
The signal from AUX
AUDIO
IN
is automatically muted during radio
communications or pilot selection of crew intercom isolation modes
located
on
the Garmin GMA 1347 audio panel. The AUX key
on
the
GMA 1347 audio
panel does not control the AUX AUDIO
IN
signal.
For a more complete description
and
operating instructions of the
audio
panel, refer to the Garmin G1000 Cockpit Reference Guide.
(Continued Next Page)
7-68
U.S.
172SPHAUS-03
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