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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