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Page 10-2 G3X Installation Manual – Return to Service
Revision A 190-01115-01
10.2.2 New GSU 73 Installed
If a new GSU 73 is installed (new serial number), verify the correct software version on the MAIN page
in configuration mode. If the correct software version is not installed, load the GSU 73 software
contained in the G3X system software loaded to the displays. If the configuration module is operational,
no software configuration is required. Continue to Section 10.3.
10.3 GMU 44
NOTE
If the GMU 44 is removed, the anti-rotation properties of the mounting screws must be restored. This
may be done by replacing the screws with new Garmin P/N 211-60037-08. If original screws must be re-
used, coat screw threads with Loctite 242 (blue) thread-locking compound, Garmin P/N 291-00023-02, or
equivalent. Important: Mounting screws must be brass.
10.3.1 GMU 44 is Reinstalled
Any time a GMU 44 is reinstalled, a new magnetometer calibration is required (Section 8.3.3). Continue
to Section 10.3.2
10.3.2 New GMU 44 Installed
If a new GMU 44 is installed (new serial number), a new magnetometer calibration (Section 8.3.3) and
verification of the correct software version (Section 7.2) is required. If the correct software version is not
installed, load the GMU 44 software contained in the G3X system software which is loaded to the
displays (Section 7). Following a successful magnetometer calibration, and software verification the
Return to Service Procedure is complete.