Cessna 172R, Operating Handbook

Page: 411 / 500

CESSNA
MODEL 172R SECTION
9 -
SUPPLEMENTS
SUPPLEMENT 7 - FAA APPROVED
NOTE
•
When REV is
selected, the autopilot will flash HDG
I
for 5 seconds
to
remind the pilot
to reset
the HDG
bug
to
the localizer FRONT COURSE INBOUND
heading. If heading mode was in use
at
the time of
REV button
selection, a 45° intercept angle will
then be automatically established based on the
position
of
the bug.
•
All angle intercepts compatible with radar
vectors
I
may be
accomplished by selecting ROL mode
PRIOR
to
pressing the REV button. The
HDG bug
must
still be
positioned to the localizer FRONT
COURSE INBOUND heading to provide course
datum to
the autopilot when using a DG.
1)
If the
CDI
needle is
greater
than
2 to 3
dots
from
center,!
the autopilot will annunciate REV
ARM!
when the
computed
capture
point is reached the ARM annunciator will go
out
and the selected back course will be automatically captured
and tracked.
2) If the CDI needle
is less than 2
to
3 dots from
center,
the!
HDG mode will disengage upon selecting REV mode;
the
REV annunciator will illuminiate
and
the
capture/track
sequence will automatically begin.
2.
When equipped
with HSI:
a. Course Bearing
Pointer
-
SET
to
the ILS front course inbound
heading.
b. Heading Selector Knob
--
SET BUG
to
provide desired
intercept
angle and engage HDG mode.
c. REV Mode Selector Button
--
PRESS.
1) If the D-Bar is
greater
than
2 to 3 dots from
center,
thel
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.
Revision 4
S7-19