Cessna 172R, Operating Handbook

Page: 437 / 500

CESSNA
MODEL 172R SECTION 9
-
SUPPLEMENTS
SUPPLEMENT 15
-
FAA APPROVED
14. OMNI BEARING SELECT
(OBS) KNOB
-
Selects
the
desired course
to
be tracked by the autopilot. (Note: The
HDG
bug
must
also be positioned to
the proper course
to
capture
and track the selected radial or desired track).
15. 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.
16. PITCH TRIM (PT) Annunciator
--
Indicates the direction of
required pitch trim. The annunciation will flash
if auto
trim
has
not
satisfied the
request
for trim for a period of
10
seconds. A solid
j
without an arrowhead is an indication
of
a pitch trim fault.
Refer
to
the EMERGENCY
PROCEDURES for proper response
to
a pitch trim fault.
17. PITCH
TRIM Annunciation
(located on
instrument panel or
glareshield)
--
Illuminates whenever the automated
preflight
self
test
detects a pitch trim
fault
or the continuous
monitoring
system
detects a pitch trim fault in flight. Refer
to
the EMERGENCY PROCEDURES for proper response
to
a
pitch trim fault.
**18.
AUTOPILOT ENGAGE
[AP]
Annunciation
--
Illuminates
whenever the autopilot is engaged. Flashes during pilot
initiated
or automatic
disengagement.
“Airplane
serials
17280831
thru
17281118
incorporating!
Honeywell Service Bulletin KC140-M1, and airplane serials
17281119 and on.
Figure 2. Bendix/King 2-Axis KAP 140 Autopilot, Operating
Controls and Indicators (Sheet
4)
Revision 2
S15-11