Cessna 172R - OMNI Bearing Select (OBS) Knob; Pitch Trim (PT) Annunciator; Autopilot Engage (AP) Annunciation

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
15
-
FAA
APPROVED
14.
OMNI
BEARING
SELECT
(OBS)
KNOB
-
Selects
the
desired
course
to
be tracked
by
the
autopilot.
(Note:
The
HDG
bug
must
also
be
positioned
to
the
proper
course
to
capture
and track the selected
radial
or
desired
track).
15.
HEADING
SELECT
KNOB
(HDG)
--
Positions
the
heading
pointer
("bug")
on
the
compass
card. Note that the
position
of
the
heading
bug
also
provides
course
datum
to
the
autopilot
when
tracking
in
NAV, APR,
or
REV
(BC)
modes.
This
is
in
addition
to
its
more
intuitive
use
in
the
HDG
mode.
16.
PITCH
TRIM
(PT)
Annunciator
--
Indicates the direction
of
required pitch
trim. The
annunciation
will
flash
if
auto
trim
has
not
satisfied
the
request
for
trim
for
a
period
of
10
seconds.
A
solid
j
without
an
arrowhead is
an
indication
of
a
pitch
trim
fault. Refer
to
the
EMERGENCY
PROCEDURES
for
proper
response
to
a
pitch
trim
fault.
17.
PITCH
TRIM
Annunciation
(located
on
instrument
panel
or
glareshield)
--
Illuminates
whenever the
automated
preflight
self
test
detects
a
pitch
trim
fault
or
the continuous
monitoring
system
detects
a
pitch
trim
fault
in
flight.
Refer
to
the
EMERGENCY
PROCEDURES
for
proper response
to
a
pitch
trim
fault.
**18.
AUTOPILOT ENGAGE
[AP]
Annunciation
--
Illuminates
whenever the
autopilot
is
engaged.
Flashes
during
pilot
initiated
or
automatic
disengagement.
“Airplane
serials
17280831
thru
17281118
incorporating!
Honeywell
Service
Bulletin
KC140-M1,
and
airplane
serials
17281119
and
on.
Figure
2.
Bendix/King
2-Axis
KAP
140
Autopilot,
Operating
Controls
and Indicators
(Sheet
4)
Revision
2
S15-11