Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 348

CESSNA
MODEL 172S NAV III
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3
EMERGENCY PROCEDURES
(Continued)
WARNING
FOLLOWING AN AUTOPILOT, AUTOTRIM OR
MANUAL ELECTRIC TRIM SYSTEM MALFUNCTION,
DO NOT ENGAGE THE AUTOPILOT UNTIL THE
CAUSE OF THE MALFUNCTION HAS BEEN
CORRECTED.
A flashing auto trim annunciation on the face of the autopilot
indicates a failure in the pitch trim system. The pitch trim (autotrim)
system has not reduced the load on the pitch servo sufficiently
quickly. This condition should be temporary.
1. FLASHING ANNUNCIATION - OBSERVE airplane pitch
behavior. If pitch behavior is satisfactory, wait 5 to 10
seconds for the annunciation to go off.
2. If annunciation continues, CONTROL WHEEL - GRASP
FIRMLY, DISENGAGE the autopilot and CHECK for out of
trim condition in pitch. Manually trim to reduce control
forces.
3. AUTOPILOT OPERATION - CONTINUE, if satisfied that the
pitch trim malfunction indication was temporary.
DISCONTINUE if failure of autotrim.
If a red P or R is shown on the face of the autopilot:
1. A red P indicates that the pitch axis system of the autopilot
has been disabled and cannot be engaged.
WARNING
DO NOT ENGAGE THE AUTOPILOT IF ONLY THE
ROLL AXIS IS OPERATING.
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FAA APPROVED
172SPHAUS-S3-00
U.S. S3-19