Garmin GI 275 Installation Manual page 255

5.7.2.6 Cessna 300B/400B/800B Autopilots
The following steps outline the alignment procedure:
1. Power on the GI 275 in Configuration mode.
2. Navigate to the Gyro Output Test page (Calibration/Test → Autopilot → Gyro Output Test).
3. Verify that the internal AHRS test values are valid (i.e., Attitude Valid button is illuminated
green).
4. Perform the Roll Error Output Null Adjustment, Roll Gyro Gain Adjustment, Pitch Error Output
Null Adjustment, and the Pitch Gyro Gain Adjustment as described in Cessna autopilot system
service manual, with the following difference:
a. It is not necessary to remove the AHRS from the aircraft. To set pitch and roll as directed in
the procedure, use the Gyro Output Test page to set the pitch angle and roll angle to the
desired values.
5.7.2.7 Cessna 1000A Autopilots
The following steps outline the alignment procedure:
1. Power on the GI 275 in Configuration mode.
2. Navigate to the Gyro Output Test page (Calibration/Test → Autopilot → Gyro Output Test).
3. Verify that the internal AHRS test values are valid (i.e., Attitude Valid button is illuminated
green).
4. Perform Attitude Gyro System Interface Adjustments as described in the Cessna autopilot system
service manual, with the following difference:
a. It is not necessary to remove the AHRS from the aircraft. To set pitch and roll as directed in
the procedure, use the Gyro Output Test page to set the pitch angle and roll angle to the
desired values.
5.7.2.8 Century II/III Autopilots
The following steps outline the gyro alignment procedure:
1. Power on the GI 275 in Configuration mode.
2. Navigate to the test page (Calibration/Test → Autopilot → Gyro Output Test).
3. Set the Relays selection to Attitude Valid.
4. Perform the Ground Setup Procedures as described in the Century IIB & III Autopilot Service
Manual (Section VIII steps 1 to 14) with the following differences:
NOTE
It is not necessary to use a Gyro Substitute Box as directed in the procedure.
a. To set the HDG Bug as directed in the procedure, use the AP Test page (Calibration/Test →
Autopilot → Test).
b. To set roll as directed in the procedure, use the Gyro Output Test page.
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Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 5-77