Cessna 172R Pilot Operating Handbook page 319

CESSNA
SECTION 9 - SUPPLEMENTS
MODEL 172R
SUPPLEMENT 7 - FM APPROVED
HEADING HOLD
Heading Selector Knob -- SET bug to desired heading.
HDG Mode Selector Button
PRESS.
Note HDG mode
annunciator ON. Autopilot will automatically turn the aircraft
to
the selected heading.
COMMAND TURNS (HEADING HOLD MODE ENGAGED)
1. Heading Selector Knob -- MOVE bug to the desired heading.
Autopilot will automatically turn the aircraft to the new selected
heading.
NAV COUPLING
#1 OBS Knob -- SELECT desired course.
NAV Mode Selector
Button
--
PRESS.
Note NAVARM
annunciated.
Heading Selector Knob -- ROTATE bug to agree with OBS
course.
NOTE
When NAV is selected, the autopilot will flash HDG for
5
seconds to remind the pilot to reset the HDG bug to the
OBS course. A 45°
intercept angle will then be
0
automatically established based on the position of the
bug.
NOTE
An all-angle intercept after receiving radar vectors
may
be accomplished by deactivating HDG mode (defaulting
to ROL) just prior to pressing the NAV button.
The
heading bug must still be positioned to agree with the
OBS course to provide course datum to the autopilot but
the airplane will track approximately the last heading
until intercept.
If the Course Deviation Indicator (CD!) needle is greater than 2
to 3 dots from the center: the autopilot
will annunciate
NAVARm; when the computed capture point is reached
the
ARM annunciator will go out and the selected course will be
automatically captured arid tracked.
Dec 2/96
S7-11
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