Figure 6-4 Gpss Selection - Garmin GI 275 Installation Manual

6.3.9.5.2 Analog GPS Roll Steering Check
This check verifies that the GPSS/HDG Control selection is configured correctly and also verifies the
operation of the analog GPS roll steering interface between the GI 275 and the autopilot.
NOTE
The Heading and Course Error Check in Section 6.3.9.3 must be successfully completed
prior to checking the operation of the GI 275 Analog GPS roll steering.
1. Power on the GI 275 system in Normal mode.
2. Use the CDI button to select GPS as the navigation source on the HSI.
3. Pull up the menu and touch HSI Options → HDG Options menu and change the AP HDG REF to
GPSS.
4. Verify that "GPSS" is displayed.
5. Verify the cyan heading bug is hollowed out.
6. Pull up the menu and touch HSI Options → HDG Options menu and change the AP HDG REF to
HDG Bug.
7. Verify that "GPSS" is no longer displayed.
GNS 4XXW/5XXW Series, GTN 6XX/7XX Series, and GTN Xi Series Units
The following steps are not required if the Heading Error Test has been successfully completed. Due to the
nature of the GNS 4XXW/5XXW, GTN 6XX/7XX, and GTN Xi self-test operation, it may be difficult to
observe the self-test response. It is recommended that the Heading Error Test be used in place of self-test
operation. Perform the following check for the GPS source that is providing navigation data to the HSI:
1. Power on the GPS unit is in Normal mode.
2. Proceed to the Instrument Panel Self-Test page.
3. Ensure that "GPSS" is displayed on the GI 275 (refer to Figure 6-4).
4. Engage the autopilot in HDG mode. If possible, engage only the flight director and not the
autopilot servos.
5. If available, verify that the flight director slowly moves back and forth between a right bank and
wings level. If the flight director is not available, verify that the autopilot rolls the control yoke or
stick to the right if AP is engaged.
GNS 480 Navigator
For the GPS source that is providing navigation data to the HSI, do the following:
1. Power on the GNS 480 is in Ground Maintenance mode and navigate to the Autopilot Test page.
2. Ensure that "GPSS" is displayed on the GI 275.
3. Set the ROLL/STEER to 10°R.
4. Verify that the autopilot rolls the control yoke or stick to the right.
5. Set the ROLL/STEER to 0°.
6. Verify that the autopilot rolls the control yoke or stick level.
190-02246-10
Rev. 11

Figure 6-4 GPSS Selection

GI 275 Part 23 AML STC Installation Manual
Page 6-20