Cessna 172R, Operating Handbook

Page: 448 / 500

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