Approach Mode Operation - Cessna 172S NAV III Pilot Operating Handbook

SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3
NORMAL PROCEDURES
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APPROACH (APR) MODE OPERATION
CESSNA
MODEL 172S NAV III
APR mode gives more precise tracking during instrument approach
procedures. It engages automatic lock on to the final approach
course on most approaches and automatic capture of the glideslope
on ILS approaches.
The G1000 System will automatically change from GPS to ILS at
final approach course lock on (only when the procedure has been
activated in the flight plan and the ILS COl Capture feature is
enabled). Automatic change to VHF navigation is only provided for
ILS approaches.
WARNING
WHEN THE KAP 140 AUTOPILOT IS ENGAGED IN
NAV, APR OR REV OPERATING MODE, IF THE
HSI NAVIGATION SOURCE IS CHANGED FROM
GPS TO NAV1, AUTOMATICALLY OR MANUALLY
(USING THE COl SOFTKEY), OR MANUALLY
FROM NAV2 TO GPS, THE CHANGE WILL
INTERRUPT THE SIGNAL TO THE AUTOPILOT
AND CAUSE THE AUTOPILOT TO GO BACK TO
ROL MODE OPERATION. NO WARNING CHIME
OR PFD ANNUNCIATION WILL BE SUPPLIED.
THE PREVIOUSLY-SELECTED MODE SYMBOL
SHOWN ON THE FACE OF THE AUTOPILOT WILL
FLASH TO SHOW THE CHANGE TO ROL MODE
OPERATION. IN ROL MODE, THE AUTOPILOT
WILL ONLY KEEP THE WINGS LEVEL AND WILL
NOT CORRECT THE AIRPLANE HEADING OR
COURSE. SET THE HOG BUG TO THE CORRECT
HEADING AND SELECT THE CORRECT
NAVIGATION SOURCE ON THE HSI USING THE
COl SOFTKEY BEFORE ENGAGING THE
AUTOPILOT IN ANY OTHER OPERATING MODE.
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S3-38 U.S.
FAA APPROVED
172SPHAUS-S3-00