Textron 172R180HP, Pilot Operating Handbook

Page: 357 / 396

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CESSNA
MODEL 172R
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 7 - FAA APPROVED
BACK COURSE APPROACH COUPLING
1. #1 OBS Knob -- SELECT the localizer front course inbound
heading (as a memory aid).
2. REV Mode Selector Button -- PRESS.
3. Heading Selector Knob - ROTATE BUG to the localizer front
course inbound heading.
NOTE
When REV is selected, the autopilot will flash HOG for 5
seconds to remind the pilot to reset the HDG bug to the
localizer front course inbound heading. 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 AOL) just prior to pressing the REV button. The HOG
bug must still be positioned to the localizer front course
inbound heading to provide course datum to the
autopilot, but the airplane will track approximately the
last heading until intercept.
4. If the Course Deviation Indicator (CDI) needle is greater than 2
to 3 dots from the center: the autopilot will annunciate
REVARM; when the computed capture point is reached the
ARM annunciator will go out and the selected back course will
be automatically captured and tracked.
5. If the Course Deviation Indicator (CDI) needle is less than 2 to
3 dots from the center: the HDG mode will disengage upon
selecting REV mode; the REV annunciator will illuminate and
the capture/track sequence will automatically begin (after 5
seconds allotted to position the heading bug to the front
course inbound heading).
Dec 2/96
S7-13