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

Page: 354 / 490

SECTION 9 - SUPPLEMENTS CESSNA
SUPPLEMENT 3 MODEL 172S NAV III
KAP 140 AUTOPILOT
U.S.
FAA APPROVED
NORMAL PROCEDURES
PREFLIGHT (PERFORM BEFORE EACH FLIGHT):
1. MASTER Switch (BAT) - ON
2. AVIONICS Switch BUS 2 - ON
3. POWER APPLICATION and SELF-TEST - The autopilot tests
itself when power is first made available. The test is a sequence
of internal checks before starting normal system operation. The
test sequence is shown on the face of the autopilot as PFT X .
“X” is the test sequence step number. Successful completion of
the self-test is shown by all autopilot display elements coming
on (Display Test), the PITCH TRIM annunciator on the PFD
coming on and the operation of the autopilot disengagement
tone.
WARNING
IF THE RED P STAYS ON, THE AUTOPILOT HAS
FAILED THE PREFLIGHT TEST. OPEN (PULL) THE
AUTO PILOT CIRCUIT BREAKER TO MAKE SURE THAT
THE AUTOPILOT AND MANUAL ELECTRIC TRIM
SYSTEM WILL NOT OPERATE.
NOTE
When power is first supplied to the autopilot, the red P
(pitch axis) annunciator may come on the face of the
autopilot to show that the pitch system cannot be engaged.
This condition should last approximately 30 seconds. The
red P (pitch axis) annunciator will go off and the autopilot
pitch trim system will function correctly.
(Continued Next Page)
172SPHAUS-S3-01
S3-20
For
Training
Purposes
Only