Textron Cessna 172R - Page 401

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
7
-
FAA
APPROVED
4.
NAVIGATION
(NAV)
MODE
SELECTOR
BUTTON
-
When
pushed,
will
select the
Navigation
mode.
This mode
provides
automatic beam
capture
and
tracking
of
VOR, LOC,
or
GPS
signals
as
selected
for
presentation
on
the
NAV#1 CDI
or
HSI
(if
installed).
5.
APPROACH
(APR)
MODE
SELECTOR
BUTTON
-
When
pushed,
will
select the
Approach
mode.
This
mode
provides
automatic beam
capture
and
tracking
of
VOR, LOC,
or
GPS
signals
as
selected
for
presentation
on
the
NAV
#1 CDI
or
HSI
(if installed).
The
greater
tracking
sensitivity
of
the
APR
mode
is
recommended
for
instrument
approaches.
6.
BACK
COURSE
APPROACH
(REV)
MODE
SELECTOR
BUTTON
--
This
button is
active
only
when
the
coupled
navigation
receiver
is
tuned
to
a
LOC/ILS
frequency.
When
pushed,
it
will
select the
Back
Course
(BC)
approach
mode.
This
mode
functions
indentically
to
the
approach
mode
except
that the
autopilot
response
to
LOC
signals
is
reversed.
7.
HEADING
SELECT
KNOB
(HDG)
-
Positions the
heading
pointer
("bug")
on
the
compass
card. Note that the
position
of
|
the
heading
bug
also
provides
course
datum
to
the
autopilot
when
tracking
in
NAV, APR,
or
REV
(BC)
modes. This is
in
addition
to
its
more
intuitive
use
in
the
HDG
mode.
8.
OMNI BEARING
SELECT
KNOB
(OBS)
-
Selects
the desired
course
radial
to
be tracked
by
the
autopilot.
(Note
that the
HDG
bug
must
also
be
positioned
to
the
proper
course
to
capture
and
track the
selected
radial).
9.
AUTOPILOT
DISCONNECT
(A/P
DISC)
SWITCH
-
When
depressed
will
disengage
the
autopilot.
The
autopilot
disconnect
will
be annunciated
by
a
continuous
two-second
tone
accompanied
by
a
flashing
"AP"
displayed
on
the
autopilot
computer.
10.
AUTOPILOT CIRCUIT
BREAKER
-
A
5-amp
circuit
breaker
supplying
28
VDC
to
the
KAP
140
system.
Figure
1.
Bendix/King
KAP
140
Autopilot,
Operating
Controls
and
Indicators
(Sheet
3
of
3)
Revision
4
S7-9
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