Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 342

CESSNA
MODEL 172S NAV III
GENERAL
(Continued)
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3
19. ROTARY KNOBS - Used to set the altitude alerter reference
altitude; or may be used immediately after pressing the
BARD button, to adjust the autopilot baro setting to match
that of the airplane's altimeter when manual adjustment is
required.
20. BARO SET (BARO) BUTTON - When pushed and released,
will change the display from the altitude alerter selected
altitude to the baro setting display (either in. HG or HPA) for
3 seconds. If pushed and held for 2 seconds, will change
the baro setting display from in HG to HPA or vice versa.
Once the baro setting display is visible the rotary knobs may
be used to adjust the baro setting.
21. ALTITUDE ARM (ARM) BUTTON - When pushed, will
change the altitude arming function between on or off.
When ALT ARM is annunciated, the autopilot will capture
the altitude alerter displayed altitude (provided the airplane
is climbing or descending in VS to the displayed altitude).
ALT hold arming when the autopilot is engaged is automatic
upon altitude alerter altitude selection via the rotary knobs.
Note that the alerter functions are independent of the arming
process thus providing full time alerting, even when the
autopilot is disengaged.
22. ALTITUDE ALERTERNERTICAL SPEED/BARO SETTING
DISPLAY - Normally displays the altitude alerter selected
altitude. If the UP or DN button is pushed while in VS hold,
the display changes to the command reference for the VS
mode in FPM for 3 seconds. If the BARO button is pushed,
the display changes to the autopilot baro setting in either in
HG or HPA for 3 seconds.
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FAA APPROVED
172SPHAUS-S3-00
U.S. S3-13