190-01115-01 G3X/G3X Touch Installation Manual - Maintenance
Rev. AC Page 36-6
36.2.3 GSU 25
A pitot/static check as outlined in 91.411 and Part 43 Appendix E must be completed if the
pitot/static lines are broken.
During a pitot/static test, if the AOA port is unused, connect it to the static port to
avoid overpressuring (and causing damage to) the internal AOA sensor.
36.2.3.1 Original GSU 25 is Reinstalled
No software or calibration is required if the original GSU 25 is reinstalled in its original mounting location.
Continue to Section 36.2.4
.
36.2.3.2 New GSU 25 is Installed
Any time a new GSU 25 is installed, or an existing GSU 25 is moved to a different mounting location, the
AHRS unit orientation (Section 33.4.3.1 for GDU 37X systems and Section 34.4.5.1 for GDU 4XX
systems), pitch/roll offset (Section 33.4.3.2
for GDU 37X systems and Section 34.4.5.2 for GDU 4XX
systems), and magnetometer calibration procedures (Section 33.4.4.3
for GDU 37X systems and
Section 34.4.6.3
for GDU 4XX systems) must be performed. The correct GSU 25 software version will
automatically be loaded from the GDU.
36.2.4 GMU 11/22
If the GMU 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.
36.2.4.1 GMU is Reinstalled
Any time a GMU is reinstalled, a new magnetometer calibration is required (Section 33.4.4.3
for
GDU 37X systems and Section 34.4.6.3
for GDU 4XX systems). Continue to Section 36.2.4.2
36.2.4.2 New GMU Installed
If a new GMU is installed (new serial number), a new magnetometer calibration (Section 33.4.4.3
for
GDU 37X systems and Section 34.4.6.3
for GDU 4XX systems) is required. Following a successful
magnetometer calibration, the Return to Service Procedure is complete.
36.2.5 GEA 24
No additional action is required when a GEA 24 is reinstalled or replaced. The correct GEA 24 software
version and EIS configuration will automatically be loaded from the GDU.
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