Garmin G3X Installation Manual page 605

For each Calibration Procedure, Table 32-2 lists the LRUs that require valid calibration data.
Table 32-2 Data Validity Requirements for ADAHRS Calibration Procedures
ADAHRS Calibration
Procedure
Unit Orientation
Pitch/Roll Offset
Magnetometer Calibration
Engine Run-Up
Magnetometer Interference Test
ADAHRS Static Pressure
Calibration
Table 32-3 lists the type of valid calibration data required to be output by each LRU for the Calibration
Procedures listed in Table 32-2.
Table 32-3 Configuration Mode ADAHRS Calibration Page Status Boxes
Status Box
Magnetometer Measurement of local 3D magnetic field available
True Airspeed (TAS) available. NOTE: A valid outside air temperature (OAT)
Air Data
measurement is required for TAS to be valid.
GPS 3D or 3D Differential GPS solution available
The ADAHRS Calibration Page status boxes referred to in Table 32-2 and Table 32-3 are shown in
Figure 32-3.
If removal and replacement of a GMU 22 unit is required after post-installation calibration has been
completed, the GMU 22 mounting rack must not be moved. If the mounting screws that secure the
GSU 25/GSU 73 unit or the GMU 22 mounting rack are loosened for any reason, post-installation
calibration procedure, A, B, D, and E must be repeated before the aircraft can be returned to service.
Any GMU 22 removal or replacement requires repeating the magnetometer calibration.
A repeat of the pitch/roll offset procedure (Procedure B) requires a repeat of the magnetometer calibration
procedure (Procedure D).
190-01115-01 G3X/G3X Touch Install Manual - GDU 45X/46X Config and Post Install Checkout
Rev. AA
Valid Status Required for
GSU 25 Calibrations
None
None
GPS and Magnetometer
None
Magnetometer
None
Figure 32-3 ADAHRS Status Boxes
Valid Status Required for
GSU 73 Calibrations
GPS and Air Data
Air Data, GPS, and
GPS or Air Data
GPS or Air Data. Magnetometer
always required.
Valid Status
None
Magnetometer
None
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