Cessna 172S Nav III Information Manual page 336

SECTION 9 - SUPPLEMENTS CESSNA
SUPPLEMENT 3 MODEL 172S NAV III "
NORMAL PROCEDURES (Continued) -
APPROACH (APR) MODE OPERATION —
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 CDI 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 CDI 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 HDG BUG TO THE CORRECT
HEADING AND SELECT THE CORRECT —
NAVIGATION SOURCE ON THE HSI USING THE
CDI SOFTKEY BEFORE ENGAGING THE
AUTOPILOT IN ANY OTHER OPERATING MODE. _
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FAA APPROVED
S3-38 U.S. 172SPHAUS-S3-00
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