Cessna 172S Pilot Operating Handbook page 149

C ESSNA
MODEL 1 72S
3 . Note that the emergency proced u re for any malfu nction is
essential ly the sam e :
and regain airplane control while pressi ng and holding the NP
DISCITR I M INT switch down , and retrim the airplane as
needed . After these steps have been accomplished secure
the autopilot electric trim system by pulling the autopilot
(AUTO P I LOT) circuit breaker.
emergency procedure, it is important that the 4 steps of the
emergency procedu re located on Page 1 5 be com mitted to
memory.
4. The AVION ICS MASTE R switch may be used to remove all
electric power from the Autopilot and Electric Trim systems
whi le the circuit breaker is located and pulled .
AVION ICS MASTER switch to the ON position as soon as
possible. With the AVION ICS MASTE R switch off, all avionics
and autopilot equ ipment will be i noperable.
5. It is i mportant that all portions of the autopilot and electric trim
system are preflight tested prior to each flight i n accordance
with the procedures published herein in order to assure their
integrity and contin ued safe operation during flight.
DO NOT RESET AUTOPILOT CIRCUIT BREAKER
FOL LOWING
MANUAL ELECTRIC TRIM MALFUNCTION UNTIL
THE CAUSE FOR THE MALFUNCTION HAS
BEEN CORRECTED.
�
A flashing auto trim annunciation on the face of the autopilot
indicates a failure of the auto trim function to relieve pitch servo
loading in a timely man ner. This condition should be tem porary.
1 . FLAS H ING
behavior. If pitch behavior is satisfactory, wait 5- 1 0 seconds
for the annunciation to stop.
Original Issue
S U P P L E M E NT 1 5 - FAA APPROVED
i m mediately g rasp the control wheel
A
WARNING
AN AUTOPILOT/AUTOTRIM
�
ANNUNCIATION -- OBSERVE aircraft pitch
S ECTION 9 - SU PPLEMENTS
As with any other airplane
Return the
OR
S 1 5- 1 7