Gi 275 Removal; Gi 275 Re-Installation; Gi 275 Checkout - Garmin GI 275 Maintenance Manual

5.1.1

GI 275 Removal

Remove the GI 275 using the following procedure:
1. Ensure the current configuration is saved to a USB drive in accordance with the instructions in
Section 2.3.7.
2. Power off the GI 275 and remove power.
NOTE
The remaining steps can be performed in any order, if more practical and convenient.
3. Remove the three screws retaining the GI 275 in the instrument panel.
4. Loosen retaining screws and disconnect backshell wiring connector(s) from the back of the
GI 275.
5. Remove the BNC connector, if installed.
6. Disconnect the pitot-static lines.
5.1.2

GI 275 Re-installation

Re-install the GI 275 using the following procedure:
1. Place the GI 275 into the instrument panel cutout.
2. Install the three screws. Torque to specifications in Figure 5-1.
NOTE
Steps 3 through 5 can be performed in any order, if more practical and convenient.
3. If removed, seal the 1/8-27-NPT male thread fittings with MIL-S-15204 Sealing Compound (Type
A or B) and connect the pitot-static lines to the unit.
4. Connect the backshell wiring connector(s) to the back of the GI 275 and tighten the retaining
screws.
5. Connect the antenna BNC connector, if installed.
6. Perform Pitot-static System Leak Check per Section 5.9.2.5, if applicable.
7. Perform the Configuration mode ground checks in Section 5.9.1 and checkouts specified in
Section 5.1.3.
5.1.3

GI 275 Checkout

Perform the following checkout procedures to return the rotorcraft to service after re-installation of a
GI 275 unit:
• For all re-installed GI 275 units:
◦ Verify the electrical bond is in accordance with Section 3.5
• For each re-installed GI 275 ADAHRS unit:
◦ Perform the Pitch/Roll Offset per Section 5.7.1.3
◦ Perform the Engine Vibration Check per Section 5.7.1.5
◦ Perform the Magnetometer Calibration per Section 5.7.1.7
◦ Perform the Pitot-Static and Airspeed Tape Settings Checks per Section 5.9.2
• For each re-installed GI 275 that is interfaced to the backup GPS antenna:
◦ Perform the Backup GPS Signal Check per Section 5.6.3
190-02246-C2
Rev. 3
GI 275 Part 27 AML STC Maintenance Manual
Page 5-3