Cessna 172R Operating Handbook page 458

SECTION 9 - SUPPLEMENTS
SUPPLEMENT 15
When REV is selected, the autopilot will flash HDG for 5
seconds
localizer FRONT COURSE INBOUND heading.
heading mode was
selection,
automatically established based on the position of the
bug.
All angle intercepts compatible with radar
be accomplished by selecting ROL mode PRIOR
pressing the REV button. The HDG bug
positioned
heading to provide course
using a DG.
I
a)
I
b) If the CDI needle is less
b. When equipped with HSI:
1) BARO Setting (if installed)
2) Course Bearing pointer
inbound heading.
Heading Selector Knob
3)
intercept angle and engage HDG mode.
4) REV Mode Selector Button
S15-30
-
FAA APPROVED
remind the pilot
to
in use
a
intercept
45°
the localizer FRONT COURSE INBOUND
to
If the CDI needle is
the autopilot will annunciate REVARM; when
center,
the computed
annunciator will go
will be automatically captured and tracked.
the HDG mode will disengage upon selecting REV
mode; the REV annunciator will
capture/track sequence will automatically begin.
NOTE
the HDG bug
to reset
the time of REV button
at
angle
NOTE
datum the autopilot when
to
than 2 to 3 dots from
greater
point is reached the ARM
capture
and the selected back course
out
than 2 to 3 dots from center,
-
CHECK.
--
SET to the ILS front
--
SET BUG to provide desired
--
PRESS.
CESSNA
MODEL 172R
the
to
If
will then be
may
vectors
to
still be
must
illuminate and the
course
Revision 1