CESSNA
MODEL 172N
SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
AUDIO CONTROL PANEL
Two types of audio control panels (see figure 7-10) are available for
this airplane, depending upon how many transmitters are included. The
operational features of both audio control panels are similar and are
discussed in the following paragraphs.
TRANSMITTER SELECTOR SWITCH
When the avionics package includes a maximum of two transmitters, a
two-position toggle-type switch, labeled XMTR, is provided to switch the
microphone to the transmitter the pilot desires to use. If the airplane
avionics package includes a third transmitter, the transmitter selector
switch is a three-position rotary-type switch, labeled XMTR SEL. The
numbers 1, 2, or 1, 2 and 3 adjacent to the selector switches correspond to
the first, second and third (from top to bottom) transmitters in the avionics
stack. To select a transmitter, place the transmitter selector switch in the
position number corresponding to the desired transmitter.
The action of selecting a particular transmitter using the transmitter
selector switch simultaneously selects the audio amplifier associated with
that transmitter to provide speaker audio. For example, if the number one
transmitter is selected, the audio amplifier in the number one NA V / COM
is also selected and is used for ALL speaker audio. In the event the audio
amplifier in use fails, as evidenced by loss of all speaker audio, selecting
an alternate transmitter will reestablish speaker audio using the alternate
transmitter audio amplifier. Headset audio is not affected by audio
amplifier operation.
AUDIO SELECTOR SWITCHES
Both audio control panels (see figure 7-10) incorporate three-position
toggle-type audio selector switches for individual control of the audio
from systems installed in the airplane. These switches allow receiver
audio to be directed to the airplane speaker or to a headset, and heard
singly or in combination with other receivers. To hear a particular
receiver on the airplane speaker, place that receiver's audio selector
switch in the up (SPEAKER) position. To listen to a receiver over a
headset, place that receiver's audio selector switch in the down (PHONE)
position. The center (OFF) position turns off all audio from the associated
receiver.
NOTE
Volume level is adjusted using the individual receiver
volume controls on each radio.
A special feature of the audio control panel used when one or two
1 July 1979
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