Textron Cessna 172R - Page 348

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
1
-
FAA
APPROVED
CESSNA
MODEL
172R
The
Comm
portion incorporates
an
automatic
squelch.
To
override the automatic
squelch,
the
Comm
volume control
knob
is
pulled
out.
Push
the
knob
back
in
to
reactivate the
automatic
squelch.
A
"T"
will
be
displayed
during
transmit
and
"R"
during
valid
signal
reception.
The Nav
portion
uses
the
pull
out
feature
of
the
Nav volume
control
to
receive
the Nav
signal
Ident.
Pull
the volume control
knob
out to
hear the
Ident
signal
plus
voice.
Push the
knob
in
to
attenuate
the
ident
signal
and still
hear
Nav
voice.
All
controls
for
the
Nav/Comm,
except
those
for
navigation
course
selection,
are
mounted
on
the
front
panel
of
the
receiver-
transmitter.
Control
lighting
is
provided
by
NAV/COMM
interior
lighting
and the
instrument
panel
flood
lighting
system.
Operation
and
description
of
the
audio selector
panel
used
in
conjunction
with
this
radio
is
shown
and described
in
Supplement
3
in
this
section.
NOTE
The
unit
has
a
stuck
microphone
alert
feature.
If
the
microphone
is
keyed
continuously
for
greater
than
33
seconds,
the
transmitter
stops
transmitting
and
the active
Comm
frequency
flashes
to
alert
the
pilot
of
the stuck
mic
condition.
.
S1-4
Dec
2/96
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