Figure 6-3 Gpss Page - Garmin GI 275 Installation Manual

6.3.9.5 GPS Roll Steering Check
GPS roll steering is handled in one of three ways:
1. If the autopilot has an ARINC 429 roll steering input, the GI 275 can provide ARINC 429 roll
steering directly to the autopilot.
2. If an external roll steering converter has been installed, the GI 275 can provide ARINC 429 roll
steering to the converter, which then outputs an analog heading error signal to the autopilot.
3. The GI 275 can provide the roll steering via the heading error output, taking the place of a separate
roll steering converter. The autopilot is left in Heading mode, and the GI 275 varies the heading
error output to steer the autopilot.
6.3.9.5.1 ARINC 429 GPS Roll Steering Check
This test verifies that the GPS roll steering interface between the GI 275 and the autopilot is functional.
1. Power on the GI 275 system in Configuration mode.
2. Navigate to the GPSS page (Calibration/Test → Autopilot → Test → A429 Output).
3. Engage GPS Annunciate discrete output (if configured) and GPS Select discrete output (if
configured).
4. Engage the autopilot in GPSS mode. If an external roll steering converter is used, engage the
autopilot in Heading mode and set the roll steering converter to roll steering.
5. Set the Roll angle to 10°RT.
6. Set GND Speed to 50 KT.
7. Touch GPSS Valid (i.e., illuminated green).
8. Verify that the autopilot rolls the control yoke or stick to the right.
9. Set the Roll angle to 0°RT.
10. Verify that the autopilot rolls the control yoke or stick level.
11. Set the Roll angle to 10°LT.
12. Verify that the autopilot rolls the control yoke or stick to the left.
13. Set the Roll angle to 0°RT.
14. Set GND Speed to 0 KT.
15. Deselect GPSS Valid.
16. Disconnect the autopilot.
190-02246-10
Rev. 11

Figure 6-3 GPSS Page

GI 275 Part 23 AML STC Installation Manual
Page 6-19