Textron Aviation Cessna 172S NAV III Skyhawk SP, Information Manual

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CESSNA SECTION 9 - SUPPLEMENTS
MODEL 172S NAV III SUPPLEMENT 3
KAP 140 AUTOPILOT
U.S.
FAA APPROVED
EMERGENCY PROCEDURES
(Continued)
AMPLIFIED 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 PT 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 PT ANNUNCIATION - OBSERVE airplane pitch
behavior. If pitch behavior is satisfactory, wait 5 to 10 seconds
for the annunciation to go off.
2. If PT 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.
NOTE
If the red P lamp comes on because of abnormal
acceleration of the airplane (due to turbulence), the red P
lamp should go off within approximately one minute and
normal operation of the autopilot will begin again.
2. A red R indicates that the autopilot roll axis system has been
disabled and cannot be engaged. The autopilot cannot be
engaged again.
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172SPHAUS-S3-01 S3-17
For
Training
Purposes
Only