Garmin G3X Touch Maintenance Manual page 111

NOTE
The following procedures are general in nature and it may be necessary to reference the autopilot
manufacturers testing instructions to allow the autopilot to be tested properly.
8.14.1 Autopilot Engagement Check
This section verifies that the autopilot can be engaged.
1. Verify the G3X Touch system is in normal mode. Allow the PFD to obtain a valid heading,
attitude, altitude, and GPS location.
2. Verify the GPS navigator is in normal mode.
3. Engage the autopilot. If the autopilot cannot be engaged, troubleshoot using the instructions in
the autopilot installation manual.
4. If step 3 was successful, disengage the autopilot.
8.14.2 Heading and Course Error Check
This section verifies that the heading and course error interface between the GDU 4X0 and autopilot
computer is functional. For dual GDU G3X Touch installations, the following instructions apply only to the
PFD.
8.14.2.1 Heading Error
1. Verify the G3X Touch system is in normal mode.
2. On the PFD set the heading bug to the current aircraft heading.
3. On the PFD, verify HDG/CRS Valid.
4. Engage the autopilot in HDG mode.
5. Adjust the heading bug to the right.
6. Verify that the control yoke or stick moves to the right.
7. Adjust the heading bug to the left.
8. Verify that the control yoke or stick moves to the left.
9. Adjust the heading bug to the aircraft heading.
10. Disengage the autopilot.
NOTE
If the control yoke or stick moves in the opposite direction of what is expected, reverse the
LEFT/RIGHT HDG Polarity on the Autopilot Calibration page and continue the checkout
process.
8.14.2.2 VOR Course Error
Some autopilot systems might not have course error capability; and this step is not necessary for those
systems.
1. Apply power to the aircraft and aircraft systems and allow the aircraft systems to initialize.
2. Tune the VHF NAV to the NAV/COM Test Set frequency for VOR operation.
3. Set the Course pointer on the PFD HSI 15 degrees to the left of aircraft heading and ensure that
the PFD CDI is displaying VOR navigation information.
4. Simulate a VOR signal with a "TO" course equal to the aircraft heading.
5. Slowly adjust the course pointer on the PFD CDI toward the aircraft heading until VOR captures.
6. Center PFD CDI course pointer on the aircraft heading.
7. Engage the autopilot in NAV mode.
8. Adjust the NAV ramp tester course and the PFD CDI course pointer 20 degrees to the left of
current aircraft heading.
9. Verify that the flight controls move toward the left.
10. Adjust NAV ramp tester course to aircraft heading.
11. Adjust the NAV ramp tester course and the PFD HSI CDI course pointer 20 degrees to the right
Maintenance Manual
G3X Touch EFIS Part 23 AML STC
Page 101
190-02472-02
Revision 2