Cessna 172S Pilot Operating Handbook page 143

C ESSNA
MODEL 1 72S
1 4. O M N I B EARING SELECT (OBS) KNOB -- Selects the
des i red course to be tracked by the autopilot. (Note: The
H OG bug must also be positioned to the proper cou rse to
captu re and track the selected radial or desired track) .
1 5. H EAD ING S ELECT KNOB ( H OG) -- Positions the heading
pointer ("bug") on the compass card . Note that the position
of the heading bug also provides cou rse datum to the
autopilot when tracking in NAV, APR, or R EV (BC) modes.
This is in add ition to its more i ntuitive use i n the H OG mode.
1 6. P ITCH TRIM ( PT) Annunciator -- Indicates the direction of
requ i red pitch trim. The annunciation wil l flash if auto trim
has not satisfied the request for trim for a period of 1 0
seconds. A solid
of a pitch
P ROC E D U R ES for proper response to a pitch trim fault.
1 7. P ITC H TRIM Annunciation (located on i nstrument panel or
g lareshield) -- Illuminates whenever the automated preflight
self test detects a pitch trim fau lt or the contin uous
monitoring system detects a pitch trim fault in flight. Refer
to the EM E RG E N CY PROC E D U R ES for proper response to
a pitch trim fault.
** 1 8. AUTO P I LOT E NGAG E
whenever the autopilot is engaged.
i nitiated or automatic disengagement.
**Airplane serials 1 72S8001 thru 1 72S9 1 29 i ncorporating Honeywell
Service Bulletin KC 1 40-M 1 , and airplane serials 1 72S9 1 30 and on.
Figu re 2 . Bendix/King 2-Axis KAP 1 40 Autopilot, Operating
Revision 3
S U P P LE M E NT 1 5 - FAA APPROVED
�
without an arrowhead is an indication
trim fault.
Controls and Indicators (Sheet 4)
SECTION 9 - S U PPLEMENTS
Refer to the
Annunciation -- Illuminates
A P
Flashes during pilot
l
E M E RG E N CY
l
I
S 1 5-1 1