Textron Cessna 172R - Page 448

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
15
-
FAA
APPROVED
CESSNA
MODEL
172R
NOTE
If
red
"P
R"
light
is
not
observed
after
holding
RH
switch
for
5
seconds,
the trim monitor
system
has
failed.
The
flight
may
be
continued
if
the
AUTOPILOT Circuit
Breaker
is
pulled
to
the
OFF
position
until
repairs
can
be made.
d.
RH
SWITCH
-
PULL
AFT
to
UP
position
and
hold
for
5
seconds.
OBSERVE
NO MOVEMENT of
Elevator
Trim
Wheel.
Verify
red
"P R"
light
above
AP
button. Release
switch
to center
OFF
position.
e.
LH
and
RH
Switch
-
PUSH
FORWARD
SIMULTANEOUSLY
and
HOLD.
OBSERVE
MOVEMENT
of
Elevator
Trim
Wheel
in
proper
direction
(nose down).
While
holding
LH
and
RH
Switches
forward,
PRESS
and
HOLD A/P
DISC/TRIM
INT
Switch.
OBSERVE
NO MOVEMENT of
Elevator
Trim
Wheel.
Continue
to
hold
LH
and
RH
Switches
forward
and
RELEASE
A/P
DISC/TRIM
INT
Switch. OBSERVE
MOVEMENT of
Elevator
Trim
Wheel
in
proper
direction.
Release
LH
and
RH
Switches
to center
OFF
position.
NOTE
During
Steps
e.
and
f.,
verify
movement
of
elevator
trim
tab
in
proper
direction
(the
elevator
trim
tab
will
move
up
for
nose
down
trim).
If
movement
of
Elevator
Trim
Wheel is
observed while the
A/P
DISC/TRIM
INT
Switch
is
pressed,
the manual
electric trim
system
has
failed.
The
flight
may
be
continued
if
the
AUTOPILOT Circuit
Breaker is
pulled
to
the
OFF
position
until
repairs
can
be made.
f.
LH
and
RH
Switch
-
PULL
AFT
SIMULTANEOUSLY
and
HOLD.
OBSERVE
MOVEMENT
of
Elevator
Trim
Wheel
in
proper
direction
(nose up).
While
holding
LH
and
RH
Switches
aft,
PRESS
and
HOLD
A/P
DISC/TRIM
INT
Switch.
OBSERVE
NO MOVEMENT of
Elevator
Trim
Wheel.
Continue
to
hold
LH
and
RH
Switches
aft
and
RELEASE
A/P
DISC/TRIM
INT
Switch. OBSERVE
MOVEMENT
of
Elevator
Trim
Wheel
in
proper
direction.
Release
LH
and
RH
Switches
to center
OFF
position.
S15-20B
Revision
1
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