Textron Cessna 172R - Page 456

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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