Garmin GFC 500 Maintenance Manual page 45

The flight director command bars and flight controls may move up or down as the GFC
500 Autopilot is capturing the selected altitude.
8. Adjust the air data test set for 4000 ft. altitude at a vertical speed of 500 fpm.
9. Verify that the flight director command bars indicate a pitch down and the flight controls
respond in the direction of the command bars.
10. Adjust the air data test set for 3000 ft. altitude at a vertical speed of 500 fpm.
11. Verify that the flight director command bars indicate a pitch up and the flight controls
respond in the direction of the command bars when the altitude goes below 3500 ft.
12. Return the air data test set to 3000 ft. altitude and 120 kts airspeed.
13. Allow the air data test set to stabilize at the target altitude and airspeed.
14. Adjust the selected altitude on the G5 to 0 FT.
15. Press the ALT button on the GMC 507 to deselect ALT mode.
16. Verify PIT is displayed in place of ALT on the G5 with ALTS in white to the right of PIT
on the G5.
17. Press the AP DISC/TRIM INT switch to disengage the autopilot.
18. Press the FD button to remove the flight director bars from the G5.
19. Return the air data test set to field elevation and 0 kts airspeed.
9.3.2.11 LVL Mode Check
1. Set the heading bug to the aircraft heading.
2. Press the FD button on the GMC 507 to engage the flight director.
3. Verify ROL and PIT are displayed on the G5.
4. Press the HDG button on the GMC 507 to select heading mode.
5. Verify HDG and PIT are illuminated in green and ROL is extinguished on the G5.
6. Adjust the heading bug to the left.
7. Verify that the flight director command bars indicate a left turn command.
8. Rotate the UP/DN thumbwheel on the GMC 507 UP four times.
9. Verify that the flight director command bars indicate a pitch up command.
10. Press the LVL button on the GMC 507.
11. Verify that LVL and LVL are displayed in green and HDG and PIT are extinguished on
the G5.
12. Verify that the flight director command bars show level attitude and that the autopilot
engages.
13. Press the AP DISC/TRIM INT switch to disengage the autopilot.
14. Press the FD button to remove the flight director bars from the G5.
GFC 500 Autopilot with ESP Part 23 AML STC Maintenance Manual
190-02291-01
Page 38
Revision 1