190-02246-11
GI 275 Part 23 AML STC Maintenance Manual
Rev. 1
Page 5-19
NOTE
Removal, re-installation, or replacement of the GMU 11 will require a recalibration of the
AHRS. Additionally, any removal or addition of electrical components or ferrous
materials within 10 feet of the GMU 11 will require recalibration of the AHRS.
5.7.1 GMU 11 Removal
To remove the GMU 11, perform the following procedure:
1. Remove power from the GI 275 directly connected to the GMU 11.
2. Disconnect the GMU 11 connector.
3. Remove the four screws securing the GMU 11 (refer to Figure 5-11).
5.7.2 GMU 11 Re-installation
To re-install the GMU 11, perform the removal procedure in reverse. Torque the screws to 8.0 ± 1.0 in-lbf.
Perform the checkout procedure in Section 5.7.3.
5.7.3 GMU 11 Checkout
Perform the following AHRS ground checks found in Section 6 of
GI 275 Part 23 AML STC Installation
Manual
(P/N 190-02246-10) to return the aircraft to service:
• Magnetometer Calibration
• Compass Swing
• Heading Offset Compensation (if required by the previous step)
• Engine Run-up Vibration Check
