Cessna 172R Pilot Operating Handbook page 320

SECTION 9 - SUPPLEMENTS
CESSNA
SUPPLEMENT 7 - FAA APPROVED
MODEL 172R
5. If the Course Deviation Indicator (CDI) needle is less than 2 to
3 dots from the center: the HDG mode will disengage upon
se-
lecting NAV mode; the NAV annunciator will illuminate and the
capture/track sequence will automatically begin (after 5 sec-
onds alotted to position the heading bug to agree with the de-
sired course).
APPROACH (APR) COUPLING
#1 OBS Knob -- SELECT desired approach course.
(For
localiser, set it to serve as a memory aid.)
APR Mode Selector
Button
PRESS. Note APRARM
annunciated.
HDG Selector Knob -- ROTATE bug to agree with desired
approach course within 5 seconds.
NOTE
When APR is selected, the autopilot will flash HDG for 5
seconds to remind the pilot to reset the HDG bug to the desired
approach course.
A 45°
intercept angle
will then be
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 APR button. The HDG bug must still
be positioned to agree with the OBS course to provide course
datum to the autopilot, but the airplane will continue to track
approximately the last heading until intercept.
If the Course Deviation Indicator (CDI) needle is greater than 2
to 3 dots from the center: the autopilot
will annunciate
APRARM; when the computed capture point is reached the
ARM annunciator will go out and the selected course will be
automatically captured and tracked.
If the Course Deviation Indicator (CDI) needle is less than 2 to
3 dots from the center: the HDG mode will disengage
upon
selecting APR mode; the APR annunciator will illuminate and
the capture/track sequence will automatically begin (after 5
seconds alotted to position the HDG bug to agree with the
desired approach course).
S7-12
Dec 2/96
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