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CESSNA
MODEL
172N
SECTION
7
AIRPLANE & SYSTEMS DESCRIPTIONS
AUDIO CONTROL
PANEL
Two types
of
audio control panels
(see
figure
7-10)
are.available for
thisairplane,dependinguponh-owmanytransmittersareincluded.The
operati6nal features
oiuoit
audio control panels are
similar
and
are
discussed
in
the
following
paragraphs'
TRANSMITTER SELECTOR SWITCH
Whentheavionicspackageincludesamaximumoftwotransmitters,a
two-position toggle-tyie
swiTch,
labeled
XMTR' is provided to switch
the
micr^ophone
to
the tiansmitter the
pilot
desires
to
use'
If
the airplane
avionics package includes a
third tiansmitter,
the transmitter selector
switch
is
a three-position rotary-type switch' Iabeled XMTR SEL'
The
numbers
l,
2,
or
1,
Z
;d
3
adjacent
io the selector switches
correspond
to
the
first,
second and
third
(from
top
to
bottom)
transmitters
in
the
avionics
stack. To select
a
transmiiter,
place the
transmitter
selector
switch in
the
position number corresponding to the
desired
transmitter'
Theaetionofselectingaparticulartransmitterusingtlretransmitter
selector
switch
simultan"6r"iy
selects the
audio
amplif ier
associated
with
that transmitter
to
provide
spLaker audio' For
example' if
the
number
one
transmitter is
setected,
ttr" ,.raio amplifier in
the
number
one
NAV/COM
is
also
selected and
is
used
for ALL ipeaker
audio.
In
the event
the audio
u*priti""inusefails'asevidenceduytossofallspeakeraudio,selecting
an
alternate transmitier
will
reestablish
speaker audio using
the
alternate
transmitteraudioamplifier.Headsetaudioisnotaffectedbyaudio
amplifier
oPeration.
AUDTO SELECTOR SWITCHES
Bothaudiocontrolpanels(seefigure7.10)incorporatethree-position
toggle_type auaio
seteitor switcheJfor individual control of the
audio
rr;ri,
sysi"ms installed
in
the airplane.
These
switches allow receiver
audio
to
be directed
to the airplane
speaker
or to
a
headset'
and heard
"i"gry
or
in
combination
witi
othei
receivers'
To hear a particular
.""Eir",
on the airpiane
speaker, place
that receiver's audio
selector
.*it"t
in
the up
lseuexER)
position. To listen
to
a recetver over
a
headset, place
that receiver,s auhio selector switch in
the down
(PH9NE)
position.Thecenter(oFF)positionturnsoffallaudiofromtheassociated
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
JuIy
1979
7-35
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