Textron Cessna 172S Skyhawk SP, Information Manual

Page: 387 / 491

SECTION 9 - SUPPLEMENTS
SUPPLEMENT
15 - FAA APPROVED
CESSNA
MODEL 172S
I
I
NOTE
If red ~ 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 ~ on the autopilot display. 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 AlP DISCITRIM INT Switch. OBSERVE NO
MOVEMENT of Elevator Trim Wheel. Continue to hold LH
and RH Switches forward and RELEASE AlP DISCITRIM
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 niovement of
Elevator Trim Wheel is observed while the AlP
DISCITRIM INT Switch is pressed, the manual
eiectric 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 AlP DISCITRIM INT
Switch. OBSERVE NO MOVEMENT of Elevator Trim
Wheel. Continue to hold LH and RH Switches aft and
RELEASE AlP DISCITRIM INT Switch. OBSERVE
MOVEMENT of Elevator Trim Wheel in proper direction.
Release LH and RH Switches to center OFF position.
IS15-22
Revision 5