Garmin G3X Pilot's Manual page 372

AFCS
Selecting LOC Mode with GS Mode:
1) EXTERNAL NAVIGATOR: Tune and activate the desired LOC frequency.
2) G3X: Ensure that LOC1 is the selected navigation source (use the CDI
SRC Softkey on the PFD or PFD Page to cycle through external navigation
sources if necessary). The HSI should automatically slew the needle to the
correct course.
Selected
Navigation
Source
3) G3X: From the PFD or PFD Page, press the ALT/PTCH Softkey to access the
autopilot pitch modes and then press the AP APPR Softkey.
APR Key on the GMC 305
Or: Press the
This simultaneously selects LOC Mode and GS (Glideslope) Mode. If the
localizer deviation is less than half-scale when the AP APPR Softkey or
APR Key is pressed, the autopilot will activate LOC Mode and track the
localizer, otherwise LOC Mode is armed and the pilot is responsible for
intercepting the localizer.
If the following occurs, the autopilot reverts to Roll Hold Mode (wings rolled level):
• Approach Mode is active and the Navigation source is manually
switched
• The localizer signal is lost
If the Glideslope signal is lost , GS Mode will revert to Pitch Hold Mode and hold the
last pitch attitude.
350
CDI Source
Softkey
Garmin G3X Pilot's Guide 190-01115-00 Rev. K