Garmin 4XXW Series Manual - page 17
AFMS, Garmin GNS 4XXW GPS/SBAS System
190-00356-03 Rev. D
FAA APPROVED
Page 17 of 19
4.5
Coupling the Autopilot during approaches
CAUTION
When the CDI source is changed on the GNS, autopilot
mode may change. Confirm autopilot mode selection after
CDI source change on the GNS. Refer to the FAA approved
Flight Manual or Flight Manual Supplement for the
autopilot.
This installation prompts the flight crew and requires the pilot to enable the
approach outputs just prior to engaging the autopilot in APR mode.
To couple an approach:
Once established on the final approach course with the final approach
fix as the active waypoint, the GNS will issue a flashing message
indication with the following message “APR Guidance Available, Use
PROC before A/P APR”.
PROC Button ...............................................................................
PRESS
“Enable A/P APR Outputs?” ....................................................
SELECT
ENT Button .................................................................................
PRESS
If coupled, Autopilot will revert to ROL mode at this time.
Autopilot .............................................
ENGAGE APPROACH MODE
This installation supports coupling to the autopilot in approach mode once
vertical guidance is available.
To couple an approach:
Once established on the final approach course with the final approach
fix as the active waypoint, the GNS will enable vertical guidance.
Vertical Guidance .........................................
CONFIRM AVAILABLE
Autopilot .............................................
ENGAGE APPROACH MODE
The autopilot does not support any vertical capture or tracking in this
installation.
Analog only autopilots should use APR mode for coupling to LNAV
approaches. Autopilots which support digital roll steering commands (GPSS)
may utilize NAV mode and take advantage of the digital tracking during LNAV
only approaches.