190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 32-6
32.2.3 GSU 25
NOTE
A pitot/static check as outlined in 91.411 and Part 43 Appendix E must be completed if the
pitot/static lines are broken.
CAUTION
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.
32.2.3.1 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 32.2.4
.
32.2.3.2 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 (Appendix H.4.3.1
for GDU 37X systems and Section 30.4.7.1 for GDU 4XX
systems), pitch/roll offset (Appendix H.4.3.2
for GDU 37X systems and Section 30.4.7.2 for GDU 4XX
systems), and magnetometer calibration procedures (Appendix H.4.4.3
for GDU 37X systems and
Section 30.4.8.3
for GDU 4XX systems) must be performed. The correct GSU 25 software version will
automatically be loaded from the GDU.
32.2.4 GMU 11/22
NOTE
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.
32.2.4.1 GMU is Reinstalled
Any time a GMU is reinstalled, a new magnetometer calibration is required (Appendix H.4.4.3
for
GDU 37X systems and Section 30.4.8.3
for GDU 4XX systems). Continue to Section 32.2.4.2
32.2.4.2 New GMU Installed
If a new GMU is installed (new serial number), a new magnetometer calibration (Appendix H.4.4.3
for
GDU 37X systems and Section 30.4.8.3
for GDU 4XX systems) is required. Following a successful
magnetometer calibration, the Return to Service Procedure is complete.
32.2.5 GEA™ 24 Engine Interface Module
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.
GEA 24 (010-01042-00) and GEA 24B (010-02770-00) are fit/form/function the same, with the exception
of Fuel Quantity inputs. If a GEA 24 in an existing installation is replaced with a GEA 24B or vice versa,
all Fuel Quantity inputs set as Resistive inputs must be re-calibrated (refer to Appendix H.4.19
for GDU
37X systems and to Section 30.4.32
for GDU 4XX systems). Fuel Quantity inputs using the Digital or
Voltage input do not need to be re-calibrated.
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