Cessna 172R, Operating Handbook

Page: 400 / 500

SECTION 9
-
SUPPLEMENTS
SUPPLEMENT 7
-
FAA
APPROVED
CESSNA
MODEL 172R
1. ROLL (R) AXIS ANNUNCIATOR
-
When illuminated, indicates
a failure in the roll axis and
prevents
engagement
or
disengages the autopilot.
2.
AUTOPILOT ENGAGE/DISENGAGE
(AP) BUTTON
-
When
I
pushed* or pressed and held
(approx 0.25 seconds)**,
engages autopilot
if
all
preflight self test conditions are
met.
The autopilot will engage
in the basic
ROL
mode which
functions as a wings leveler. The AP button can also be
used
to
disengage the autopilot.
3. HEADING (HDG) MODE SELECTOR
BUTTON
-
When
pushed, will select the Heading mode, which commands the
airplane
to turn to
and maintain the heading selected
by the
heading
bug
on
the Directional Gyro or HSI (if
installed). A
new heading may be selected
at
any time and will result in
the
airplane turning
to
the new heading. The button can also be
used
to toggle between HDG and ROL modes. This button
can also be used
to
engage the autopilot in HDG mode. For
airplane serials
17280001
thru
17281118
not
incorporating
Honeywell Service Bulletin KC140-M1, this
button
will also
engage the autopilot in HDG mode.
*
Airplane serials
17280001 thru 17281118
not
incorporating
Honeywell Service Bulletin KC140-M1.
** Airplane serials 17280001 thru
17281118
incorporating
Honeywell Service Bulletin
KC140-M1, and airplane serials
17281119
and on.
Figure 1. Bendix/King KAP 140 Autopilot, Operating
Controls and
Indicators
(Sheet 2 of 3)
S7-8 Revision
4