Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 361

SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3
CESSNA
MODEL 172S NAV III
NORMAL PROCEDURES
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It the autopilot is engaged in VS mode (Vertical Speed):
1. UP or ON Button - PUSH momentarily tor 100 fUmin vertical
speed increments or PUSH and HOLD tor 300 fUmin/sec
vertical rate change and RELEASE at the rate desired. The
autopilot will climb or descend at rate selection.
NOTE
• The autopilot can hold a Vertical Speed selection
only it engine power and airplane weight are
correct tor the conditions. It the vertical speed
set tor the autopilot is more than the airplane
can supply and airspeed decreases sufficiently,
the airplane can be made to stall. Make sure
that the vertical speed set tor the autopilot
results in airplane performance that stays in the
operating limitations of both the autopilot and the
airplane.
• When operating at or near the best rate-ot-climb
airspeed, with the engine set to climb power or
when in Vertical Speed mode, it can be easy to
slow to airspeeds where any additional reduction
in airspeed will result reduced rate-ot-climb.
Hold sufficient airspeed during Vertical Speed
mode operation to avoid a stall.
HEADING (HOG) MODE OPERATION
1. HOG knob - SET the heading pointer ("bug") on the G1000
HSI to the correct magnetic heading using the HDG knob on
the PFD.
2. HOG Button - PUSH to engage HOG mode. Make sure that
the HOG annunciator is shown on the tace ot the autopilot.
The autopilot will turn the airplane at approximately standard
rate (3°/sec) to lock on to the heading selection.
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S3-32 U.S.
FMAPPROVED
172SPHAUS-S3-00