Garmin Gfc 500 Autopilot; Non-Garmin Autopilot Interface; Table 8-3 - Heading Verification - Adahrs Check - Garmin G3X Touch Maintenance Manual

5. Calculate the heading errors by subtracting the displayed (B) value from the actual (A) value for
each of the headings in Table 8-3.
6. If all calculated heading errors displayed on the PFD are at or within +/-10° from the surveyed
heading, the installation is acceptable, and no further work is required to correct the GMU 11
installation.
7. If a Heading Error (A-B) is greater than +/- 10°, calculate the average error by adding all errors
and dividing by 12. This is the angle by which the GMU 11 must be physically rotated to correct
the installation.
8. Modify the installation to rotate the GMU 11 by the amount calculated in the previous step. When
looking down at the GMU 11, rotate clockwise for positive values, and counterclockwise for
negative values.
9. After physically correcting the GMU 11 installation, repeat the procedures in Sections 0 and
8.12.3.
Heading (A)
360° (North)
30°
60°
90°(East)
120°
150°
180°(South)
210°
240°
270°(West)
300°
330°

8.13 Garmin GFC 500 Autopilot

For aircraft equipped with Garmin GFC 500 autopilot system, perform interface checkout of the autopilot
in accordance with procedures outlined in GFC 500 Part 23 AML STC Installation Manual 190-02291-00.

8.14 Non-Garmin Autopilot Interface

Before proceeding with the autopilot interface tests, verify the PFD has been properly configured for the
autopilot (and flight director, if applicable) that is installed. For configuration instructions reference
Appendix B.5. and the G3X Touch EFIS Part 23 AML STC Installation Manual (190-02472-01). Only
those interfaces which are directly affected by the G3X Touch STC are covered by this manual; if any
other autopilot modifications were performed, they are outside the scope of this STC and must be
checked in accordance with the autopilot installation manual.
WARNING
It is important that the PFD be properly configured in order to prevent damage to the autopilot computer.
Maintenance Manual
G3X Touch EFIS Part 23 AML STC
Table 8-3 – Heading Verification – ADAHRS Check
Displayed ADAHRS
Heading (B)
Page 100
Heading Error (A-B) Standby Compass
Heading
190-02472-02
Revision 2