Garmin GFC 500 Maintenance Manual page 44

21. Press the FD button to remove the flight director bars from the G5.
9.3.2.9 ALT 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. Press the AP button on the GMC 507 to engage the autopilot.
3. Verify ROL and PIT are displayed on the G5.
4. Press the ALT button on the GMC 507 to select ALT mode.
5. Verify ALT is displayed in green and PIT extinguishes on the G5.
6. Verify that 3000 (+/- 120) is displayed to the right of ALT on the G5.
7. Adjust the air data test set for 3500 ft. altitude.
8. Verify that the flight director command bars indicate a pitch down and the flight controls
respond in the direction of the command bars.
9. Adjust the air data test set for 2500 ft. altitude.
10. Verify that the flight director command bars indicate pitch up and the flight controls
respond in the direction of the command bars.
11. Return the air data test set to 3000 ft. altitude and 120 kts airspeed.
12. Press the ALT button on the GMC 507 to deselect ALT mode.
13. Verify that PIT illuminates in green on the G5.
14. Press the AP DISC/TRIM INT switch to disengage the autopilot.
15. Press the FD button to remove the flight director bars from the G5.
9.3.2.10 ALTS 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. Set the selected altitude on the G5 to 3500 ft.
3. Press the AP button on the GMC 507 to engage the autopilot.
4. Verify green ROL, AP, PIT, and white ALTS are displayed on the G5.
5. Adjust the air data test set for 3500 ft. altitude at a vertical speed of 500 fpm.
6. When the altitude reaches 3400 +/- 20 feet, verify that Green ALTS flashes for
approximately 3 seconds in place of PIT on the G5 and then displays steady and that
White ALT is displayed to the right of ALTS on the G5.
7. When the altitude reaches 3450 +/- 20 feet, verify that Green ALT flashes for
approximately 3 seconds in place of ALTS on the G5 and then displays steady.
NOTE:
GFC 500 Autopilot with ESP Part 23 AML STC Maintenance Manual
190-02291-01
Page 37
Revision 1