Cessna 172S Pilot Operating Handbook page 102

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SECTION 9
SUPPLEMENTS
SUPPLEMENT 7 - FAA APPROVED
2) If the D -Bar is less than 2 to 3 dots: the HOG mode will
disengage upon selecting NAV mode; the
will illuminate
automatically begin.
APPROACH (APR) COUPLING: (To enable glideslope coupling on
an ILS and more precise tracking on instrument approaches).
1. When equipped with OG:
a.
NAV #1 OBS
a localizer, set it to serve as a memory aid.)
b. Mode Selector Button
APR
annunciated.
c. Heading Selector Knob
approach.
When APR is selected, the autopilot will flash HOG for 5
seconds to remind the pilot to reset the HOG· bug to the
approach course. If HOG mode was in use at the time of
APR button selection a 450 intercept angle will then be
automatically established based on the positon of the bug.
All angle intercepts compatible with radar vectors may be
accomplished by selecting ROL mode PRIOR to pressing
the APR button. The HOG bug must still be positioned to
agree with the desired approach course to provide course
datum to the autopilot when using a DG.
1) If the O-Bar is greater than 2 to 3 dots: the autopilot will an­
nunciate
reached the
course will be automatically captured and tracked.
57-16
and the
Knob --
SELECT
ROTATE BUG
--
NOTE
NOTE
when the computed capture point is
APR A RM;
annunciator will go out and the selected
ARM
NAV
capture/track sequence
desired approach course. ( For
Note
PRESS.
--
to agree with desired
CESSNA
MODEL 172S
annunciator
will
APR A R M
3 /