Textron Cessna 172R - Page 354

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
1
-
FAA
APPROVED
CESSNA
MODEL
172R
9.
COMM
FREQUENCY
SELECTOR
KNOB
(INNER)
-
This
smaller
knob
is
designed
to
change
the
indicated
frequency
in
steps
of
50-kHz
when
it is
pushed
in,
and
in
25-kHz
steps
when
it is
pulled
out.
For
8.33
kHz
versions,
channels
are
incremented
in
25
kHz
steps
with
the
knob
pushed
in
and
8.33
kHz
with
the
knob
pulled
out.
10.
COMM
FREQUENCY
SELECTOR
KNOB
(OUTER)
-
The
outer,
larger
selector knob
is used
to
change
the
MHz
portion
-
of
the
frequency
display.
At either
band-edge
of
the
118-136
MHz
frequency
spectrum,
an
offscale
rotation
will
wrap
the
display
around
to
the other
frequency
band-edge
(i.e.,
136
MHz
advances
to
118
MHz).
11.
CHANNEL
BUTTON
-
Pressing
the
CHAN
button
for
2
or
more
seconds
will
cause
the
unit
to
enter
the
channel
program
(PG)
mode.
Upon
entering
the
channel
program
mode,
the
channel number
will
flash
indicating
that it
can
be
programmed.
The desired channel
can
be
selected
by
turning
the
comm
kHz
knob. The channel
frequency
can
be
entered
by
pushing
the
comm
transfer
button which
will
cause
the
standby
frequency
to
flash.
The
comm
frequency
knobs
are
then used
to
enter
the
desired
frequency.
If
dashes
(located
between
136
MHz
and
118
MHz)
are
entered instead
of
a
frequency,
the
corresponding
channel
is
skipped
in
channel
selection mode.
Additional channels
may
be
programmed
by
pressing
the
COMM
transfer
button
and
using
the
same
procedure.
The
channel
information
is
saved
by
pushing
the
CHAN
button which
will
also
cause
the
unit
to
return
to
the
previous
frequency
entry
mode.
The
channel selection mode
(CH)
can
then
be
entered
by
momentarily pushing
the
CHAN
button. The
comm
frequency
knobs
can
be
used
to
select
the desired channel. The
unit
will
automatically
default
to
the
previous
mode
if
no
channel is
selected within
2
seconds
after
entering
the channel selection
mode. The unit
is
placed
in
the transmit
mode
by depressing
a
mic button.
Figure
1.
Bendix/King
KX
155A
VHF
NAV/COMM
with
Kl
208
or
Kl
209A
Indicator
Head
(Sheet
6
of
7)
S1-10
Dec
2/96
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