Cessna 172R, Operating Handbook

Page: 352 / 500

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