Autopilot Operation With The Gdu 620 Emulating Gpss; Flight Director Display - Garmin G500 Pilot's Manual

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5.4.4.2

Autopilot Operation with the GDU 620 Emulating GPSS

In order to provide GPSS functionality for autopilots that do not have built-in
GPSS support, the GDU 620 can convert the GPSS commands into a heading
signal. When GPSS mode is turned on, the autopilot heading mode will follow
the GPSS commands instead of the heading bug. Refer to the Airplane Flight
Manual and autopilot system documentation for instructions on how to use the
autopilot heading mode.
Depending on the installation, GPSS mode may be toggled on/off with an
external switch or by pressing and holding the HDG key on the PFD. If the
installation uses the HDG key on the PFD, the PFD knob window will display
the GPSS/HDG mode options.
Figure 5-34 GPSS Mode Control with the HDG Key
When GPSS mode is on, the heading bug on the HSI changes to a hollow
outline and a crossed-out heading bug appears in the PFD Knob Mode Indicator,
indicating that the autopilot is not coupled to the heading bug. The bug is still
controllable and may still be used by the pilot for reference. GPSS is annunciated
in the lower left portion of the PFD. The GPSS mode annunciation depends on
the location of the NAV STATUS information, as shown in the following figure.
NAV Status Style 1
5.4.5

Flight Director Display

If autopilot flight director commands are interfaced to the G500/G600, they
will be presented as a single cue flight director on the PFD. Control of the flight
director is accomplished via the autopilot/flight director controller; there are no
pilot controls or adjustments for the flight director on the G500/G600.
5-34
GPSS OFF
Figure 5-35 GPSS Mode Annunciations
Garmin G500/G600 Pilot's Guide
GPSS ON
NAV Status Style 2
190-00601-02 Rev. J