Garmin GFC 500 Maintenance Manual page 39

9.3.2.3 Interface Checks
NOTE: Ensure that the flight controls are in a neutral position before performing the following
checks.
1. Set the heading bug to the current aircraft heading.
2. Engage the autopilot by pressing the AP button on the GMC 507.
3. Verify that ROL and PIT are displayed on the G5.
4. Verify that the flight director command bars are displayed in level pitch and roll attitude.
5. Press the HDG button on the GMC 507 to engage heading mode.
6. Verify that HDG replaces ROL on the G5.
7. Adjust the heading bug to the left of the aircraft heading.
8. Verify that the flight director command bars indicate a left turn, and that the flight controls
move toward the left.
9. Adjust the heading bug to the right of the aircraft heading.
10. Verify that the flight director command bars indicate a right turn, and that the flight
controls move toward the right.
11. Center the heading bug at the aircraft heading.
12. Click the UP/DN thumbwheel on the GMC 507 UP four times.
13. Verify that the command bars indicate a fly up command and that the flight controls drive
in the pitch up direction. Note: In some aircraft, it may be necessary to counteract any
counterweight or control system springs to assist the servo.
14. Click the UP/DN thumbwheel on the GMC 507 DN eight times.
15. Verify that the command bars indicate a fly down command and that the flight controls
drive in the pitch down direction.
16. Press the AP DISC/TRIM INT switch to disengage the autopilot.
17. 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 32
Revision 1