Garmin GFC 500 Maintenance Manual page 43

17. Verify that the flight director command bars indicate a pitch up command and the flight
controls respond in a nose up direction.
18. Return the air data test set to 3000 ft. altitude and 120 kts airspeed.
19. Press the IAS button on the GMC 507 to deselect IAS mode.
20. Verify that PIT illuminates in green on the G5.
21. Press the AP DISC/TRIM INT switch to disengage the autopilot.
22. Press the FD button to remove the flight director bars from the G5.
9.3.2.8 VS Mode Check
NOTE: Disable any ADS-B Transmitting equipment for this test to avoid interference with air
traffic control.
1. Set the air data test set to 3000 ft. altitude and 120 kts airspeed, if not already there.
2. Engage the autopilot by pressing the AP button on the GMC 507.
3. Verify ROL and PIT are displayed on the G5.
4. Press the VS button on the GMC 507 to engage VS mode
5. Verify VS is displayed in green and PIT extinguishes on the G5.
6. Verify that +0 is displayed to the right of VS on the G5 and that the VS bug setting is
shown at the bottom right of the G5.
7. Rotate the UP/DN thumbwheel on the GMC 507 UP until +1000 FPM is displayed on the
G5.
8. Verify that the flight director command bars indicate pitch up and the flight controls
respond in the direction of the command bars.
9. Rotate the UP/DN thumbwheel on the GMC 507 DN until -1000 FPM is displayed on the
G5.
10. Verify that the flight director command bars indicate pitch down and the flight controls
respond in the direction of the command bars.
11. Rotate the UP/DN thumbwheel on the GMC 507 UP until 0 FPM is displayed on the G5.
12. Verify that the flight director command bars indicate level pitch attitude and the flight
controls are centered in pitch and roll.
13. Set the air data test set for 4000 ft. altitude at a vertical speed of 1000 fpm.
14. Verify that the flight director command bars indicate pitch down and the flight controls
respond in the direction of the command bars.
15. Set the air data test set for 2000 ft. altitude at a vertical speed of 1000 fpm.
16. Verify that the flight director command bars indicate pitch up and the flight controls
respond in the direction of the command bars.
17. Set the air data test set for 3000 ft. altitude and 120 kts airspeed.
18. Press the VS button on the GMC 507 to deselect VS mode.
19. Verify that PIT illuminates in green on the G5 and that the VS bug is removed from the
G5.
20. Press the AP DISC/TRIM INT switch to disengage the autopilot.
GFC 500 Autopilot with ESP Part 23 AML STC Maintenance Manual
190-02291-01
Page 36
Revision 1