Textron Cessna 172R - Page 444

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
15
-
FAA
APPROVED
CESSNA
MODEL
172R
2.
If
annunciation
continues,
Airplane
Control
Wheel
--
GRASP
FIRMLY,
disengage
the
autopilot
and
check
for
an
out
of
pitch
trim condition.
Manually
retrim
as
required.
3.
AUTOPILOT OPERATION
-
CONTINUE
if
satisfied
that the
out
of
trim
indication
was
temporary.
DISCONTINUE
if
evidence
indicates
a
failure of
the
auto
trim
function.
A
red
P
or
R
on
the
face of
the
autopilot
computer.
1
.
A
red
P
is
an
indication
that
the
pitch
axis
of
the
autopilot
has
been
disabled and
cannot
be
engaged.
DO
NOT
ENGAGE
INTO
A
ROLL
AXIS
ONLY
SYSTEM.
NOTE
If
the red
P
lamp
was
the
result
of
some
abnormal
accelerations
on
the
airplane,
the annunciation should
be
extinguished
within
approximately
one
minute and
normal
use
of
the
autopilot
will
be reestablished.
2.
A
red
R
is
an
indication that the roll
axis
of
the
autopilot
has
been disabled and
cannot
be
engaged.
The
autopilot
cannot
be
reengaged.
Flashing
mode annunciation
in
the
display
of
the
autopilot
computer.
1.
Flashing
HDG
--
Indicates
a
failed
heading.
PRESS
HDG
button
to
terminate
flashing.
ROL
will
be
displayed.
2.
Flashing
NAV,
APR
or
REV
--
Usually
an
indication
of
a
flagged
navigation
source.
PRESS
the
NAV,
APR
or
REV
button
to
terminate
flashing.
ROL
will
be
displayed.
(Select
a
valid
navigation
source.)
NOTE
A
flashing
NAV,
APR
or
REV
annunciation
can
also be
caused
by
a
failed
heading
valid
input.
S15-18
Original
Issue
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