Textron Cessna 172R - Page 352

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
1
-
FAA
APPROVED
CESSNA
MODEL
172R
)
~
NAWFREQUENCY
TRANSFER
BUTTON
Interchanges
the
NAV
Active and
STANDBY
frequencies.
Depressing
the
NAV
frequency
transfer
button
for
2
seconds
or
more
will
cause
the
display
to
go
into
the
ACTIVE
ENTRY
mode.
Only
the
ACTIVE
frequency
will be displayed
and
it
can
be
directly
changed
by
using
the
NAV
inc/dec knobs. The
display
will
return to
the
ACTIVE/STANDBY
mode
when
the
NAV
frequency
transfer
button is
pushed.
7.
MODE
SELECTOR
BUTTON
-
Depressing
the
mode button
will
cause
the
NAV
display
to
go
from
the
ACTIVE/STANDBY
format
to
the
ACTIVE/CDI
(Course
Deviation
Indicator)
format.
In
the
CDI
mode,
the
frequency
inc/dec
knob
(pushed in)
channels
the
ACTIVE
frequency.
When
the
ACTIVE
window
is
tuned
to
a
VOR
frequency,
the
standby
frequency
area
is
replaced
by
a
three
digit
OBS
(Omni
Bearing
Selector)
display.
The
desired
OBS
course
can
be
selected
by
pulling
out
the inner
NAV
frequency
knob
and
turning
it.
This
OBS
display
is
independent
of
any
OBS
course
selected
on
an
external
CDI.
An
"OBS"
in
the
middle
of
the
NAV
display
will
flash
while
the
inner
NAV
frequency
knob
is
pulled
out.
The
CDI
is displayed
on
the line
below
the
frequency/OBS.
When
the
ACTIVE
window
is
tuned
to
a
localizer
frequency,
the
standby
frequency
area
is
replaced
by
"LOC".
When
the
received
signal
is
too
weak
to
ensure
accuracy
the display
will
"FLAG".
Depressing
the mode
button
again
will
cause
the
NAV
display
to
go
from
the
ACTIVE/CDI
format
to
the
ACTIVE/BEARING
format.
In
the
BEARING
mode,
the
frequency
inc/dec
knob
channels
the
ACTIVE
frequency
window.
Depressing
the
frequency
transfer
button will
cause
the
ACTIVE
frequency
to
be
placed
in
blind
storage
and
the
STANDBY
frequency
(in
blind
storage)
to
be
displayed
in
the
ACTIVE
window
display.
In
bearing
mode,
the
right
hand
window
of
the
NAV
display
shows
the
bearing
TO
the
station.
When
a
too
weak
or
invalid
VOR
signal
is received the
display
flags
(dashes).
Figure
1.
Bendix/King
KX
155A
VHF
NAV/COMM
with
Kl
208
or
Kl
209A
Indicator Head
(Sheet
4
of
7)
S1-8
Feb 28/00
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