Cessna 172SPHUSR05 Pilot Operating Handbook page 399

C ESSNA
MOD E L 1 72S
4. H EAD ING ( H OG) MODE SELECTOR B UTTON -- When
pushed, wil l 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 H S I (if i nstalled). A
new heading may be selected at any time and wil l result i n
t h e airplane turning to the new heading. T h e button can also
be used to toggle between H OG and ROL modes.
airplane serials 1 72S800 1 thru 1 72S9 1 29 not incorporating
Honeywell Service Bulletin KC1 40-M 1 , this button can also be
used to engage the autopilot in H OG mode.
5 . NAVIGATION ( NAV) MOD E SELECTOR BUTTON -- When
pushed, wil l select the Navigation mode. This mode provides
automatic beam capture and tracking of VOR, LOC, or GPS
signals as selected for presentation on the #1 C O L
mode is recommended for enroute navigation tracking.
6. APP ROACH (APR) MOD E SELECTOR B UTTON -- When
p ushed, wil l select the Approach mode. This mode provides
automatic beam capture and tracking of VOR, G PS, LOC and
Glideslope (GS) on an I LS, as selected for presentation on #1
COL APR mode tracking sensitivity is recommended for
instrument approaches.
7. BACK COURSE APPROACH (R EV) MOD E BUTTON -- This
button is active only when the coupled navigation receiver is
tu ned to a LOC/ILS frequency. When pushed wil l select the
Back Course approach mode. This mode functions identically
to the approach mode except that the autopi lot response to
LOC signals is reversed . Glideslope is locked out with R EV
mode.
8. ALTITU D E HOLD (AL T) MODE S ELECT BUTTON -- When
pushed, will select the altitude hold mode.
provides capture and tracking of the selected altitude.
selected altitude is the airplane altitude at the moment the
AL T button is pressed . If the AL T button is pressed with an
established VS rate present, there wil l be about a 1 00/0 (of VS
rate) overshoot.
selected altitude.
1 72S9 1 29
KC1 40-M 1 , this button can also be used to engage the
autopilot in AL T mode.
Figu re 2. Bendix/King 2-Axis KAP 1 40 Autopilot, Operating
Revision 3
S U PPLEM E NT 1 5 - FAA APPROVED
The airplane will retu rn positively to the
For airplane serials
not i ncorporating
Controls and Indicators (Sheet 2)
S ECTION 9 - S U P PLEM ENTS
1 72S8001
Honeywel l Service
I
i
For
NAV
This mode
The
thrU
I
Bulletin
I
S 1 5-9