Textron Cessna 172R - Page 408

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
7
-
FAA
APPROVED
CESSNA
MODEL
172R
NOTE
All
angle
intercepts
compatible
with
radar
vectors
may
be
accomplished
by
selecting
ROL
mode
PRIOR
to
pressing
the
NAV
button.
The
HDG
bug
must
still be
positioned
to
agree
with
the
OBS
course
to
provide
course
datum
to
the
autopilot
when
using
a
DG
(Directional
Gyro).
I
1)
If
the
CDI
needle is
greater
than
2
to
3
dots
from
center,
the
autopilot
will
annunciate
NAVARM-
When the
computed
capture
point
is
reached,
the
ARM
annunciator
will
go
out
and the
selected
course
will
be
automatically
captured
and
tracked.
I
2)
If
the
CDI
needle is less than
2
to
3
dots
from
center,
the
HDG
mode
will
disengage
upon
selecting
NAV
mode. The
NAV
annunciator
will
then illuminate and
the
capture/track
sequence
will
automatically begin.
2.
When
equipped
with
HSI:
a.
Course
Bearing
Pointer
-
SET
to
desired
course.
b.
Heading
Selector
Knob
--
SET
BUG
to
provide
desired
intercept
angle
and
engage
HDG
mode.
c.
NAV
Mode
Selector
Button
--
PRESS.
I
I
1)
If
the
Course
Deviation Bar
(D-Bar)
is
greater
than
2
to
3
dots
from
center,
the
autopilot
will
annunciate
NAVARM-
When
the
computed
capture
point
is reached
the
ARM
annunciator
will
go
out
and the selected
course
will
be
automatically
captured
and tracked.
2)
If
the
D-Bar is
less than
2
to
3
dots
from
center,
the
HDG
mode
will
disengage
upon
selecting
NAV
mode;
the
NAV
annunciator
will
illuminate
and the
capture/track
sequence
will
automatically
begin.
IS7-16
Revision
4
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