Textron Cessna 172R, Pilot Operating Handbook

Page: 443 / 500

CESSNA
MODEL 172R
SECTION 9
-
SUPPLEMENTS
SUPPLEMENT
15
-
FAA
APPROVED
3. Note that the emergency procedure for any malfunction is
essentially the same: immediately grasp the control
wheel
and regain airplane control while pressing and holding the A/P
DISC/TRIM
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 PILOT) circuit breaker. As
with any
other airplane
emergency procedure, it is important that the
4
steps
of
the
emergency
procedure located on Page 15 be committed
to
memory.
4. The AVIONICS MASTER switch may be used to remove all
electric power from the Autopilot and Electric Trim
systems
while
the
circuit
breaker is
located
and pulled. Return the
AVIONICS MASTER
switch
to
the ON
position as soon as
possible. With the AVIONICS MASTER switch off, all avionics
and autopilot equipment will be inoperable.
5. It is important that all portions of the autopilot and electric trim
system
are
preflight tested prior to each flight in accordance
with the procedures published herein in order
to
assure
their
integrity and continued safe operation during flight.
A
WARNING
DO NOT RESET AUTOPILOT CIRCUIT BREAKER
FOLLOWING
AN
AUTOPILOT/AUTOTRIM OR
MANUAL ELECTRIC TRIM MALFUNCTION UNTIL
THE CAUSE FOR THE MALFUNCTION HAS
BEEN CORRECTED.
P
rA flashing
j
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
manner. This condition
should be
temporary.
1. FLASHING
?
ANNUNCIATION
-
OBSERVE aircraft pitch
behavior. If pitch behavior is satisfactory, wait
5-10
seconds
for the annunciation
to stop.
Original Issue
S15-17
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