CESSNA
SECTION 9 - SUPPLEMENTS
MODEL 172S NAV III
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.
(Continued Next Page)
P
T
P
T
FAA APPROVED
172SPHAUS-S3-00
U.S. S3-19