Cessna 172R, 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