15G500 Cockpit Reference Guide190-01102-03 Rev CPRIMARY FLIGHT DISPLAY (PFD) PRIMARY FLIGHT DISPLAYAutopilot (AP)The G500 is able to interface to certain autopilot systems to provide heading,course, and navigation information in much the same way as a typical HSIindicator. Please refer to your particular autopilot manual for specific informationand operation instructions.HeadingYou are able to control your selected autopilot heading with the GDU 620 byusing the heading bug.Press the1) HDG key on the PFD and turn the PFD knob to set the desiredheading. When the knob is turned, the Selected Heading box will appear andremain for three seconds after the knob stops moving.Engage your autopilot in heading hold mode.2)Continue to control your selected autopilot heading by adjusting the heading3)bug on the GDU 620.Selected Heading Box on HSIAutopilot TestThe GAD 43 Adapter provides attitude and heading information from theGarmin GRS 77 Attitude and Heading Reference System (AHRS) to the autopilot.The GAD 43 has the ability to disconnect the autopilot if an error in the GAD 43output or GRS 77 is detected. This disconnect mechanism must be tested priorto each flight in the following manner:Upon GDU 620 startup, the1) AP TEST soft key is available on the GDU 620 PFD.Engage the autopilot while on the ground.2)Press the3) AP TEST soft key and verify that the autopilot disconnects and anautopilot disconnect tone is annunciated by the autopilot.NOTE: Not available with all autopilots.Selected Heading Box