Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 339

SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3
CESSNA
MODEL 172S NAV III
GENERAL
(Continued)
4. HEADING (HDG) MODE SELECTOR BUTTON - When
pushed, will select the Heading mode, which commands the
airplane to tum to and maintain the heading selected by the
heading bug on the HSI. 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 change between
HDG and ROL modes.
5. 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 set on the HSI. NAV mode is
recommended for enroute navigation tracking.
6. APPROACH (APR) MODE SELECTOR BUTTON - When
pushed, will select the Approach mode. This mode provides
automatic beam capture and tracking of VOR, GPS, LOC
and Glideslope (GS) on an ILS, as set on the HSI. APR
mode tracking sensitivity is recommended for instrument
approaches.
7. BACK COURSE APPROACH (REV) MODE BUTTON - This
button is active only when the coupled navigation receiver is
tuned to a LOCII LS frequency. When pushed will select the
Back Course approach mode. This mode functions
identically to the approach mode except that the autopilot
response to LOC signals is reversed. Glideslope is locked
out with REV mode.
8. ALTITUDE HOLD (ALT) MODE SELECT BUTTON - When
pushed, will select the altitude hold mode. This mode
provides capture and tracking of the selected altitude. The
selected altitude is the airplane altitude at the moment the
ALT button is pressed. If the ALT button is pressed with an
established VS rate present, there will be about a 10
%
(of
VS rate) overshoot. The airplane will return positively to the
selected altitude.
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S3-10 U.S.
FAA APPROVED
172SPHAUS-S3-00