SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
15
-
FAA APPROVED
CESSNA
MODEL 172R
7.
APPROACH
(APR)
COUPLING:
(To
enable
glideslope
coupling
on an
ILS
and more precise
tracking
on
instrument
approaches).
a.
When
equipped
with
DG:
1)
BARO
setting
-
CHECK
(if installed).
2)
OBS
Knob
--
SELECT
desired approach course.
(For
a
localizer,
set
it
to
serve
as a
memory aid.)
3)
APR
Mode
Selector Button
--
PRESS.
Note
APRARM
annunciated.
4)
Heading Selector
Knob
--
ROTATE BUG
to
agree
with
desired approach.
NOTE
When
APR
is
selected,
the autopilot
will flash HDG for 5
seconds
to
remind the pilot
to reset
the
HDG bug
to
the
approach course.
If
HDG
mode
was in use
at
the time
of
APR
button selection, a
45°
intercept
angle will
then be
automatically
established based on the position
of
the
bug.
I
I
NOTE
All
angle intercepts
compatible
with radar
vectors
may be
accomplished by selecting
ROL mode
PRIOR
to
pressing
the
APR button. The HDG
bug
must
still be positioned
to
agree
with the desired
approach
course
to
provide
course
datum
to
the autopilot
when
using
a
DG.
a)
If the CDI needle
is
greater
than
2 to 3
dots from
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.
b) If
the
CDI
needle is less
than 2
to
3
dots
from
center,
the
HDG
mode
will
disengage
upon
selecting APR
mode;
the
APR
annunciator
will
illuminate and the
capture/track
sequence will
automatically begin.
S15-28
Revision
1
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