Maintenance Manual 190-02472-02G3X Touch EFIS Part 23 AML STC Revision 2Page 78ConditionCalibrations RequiredGSU Pitch/RollOffsetCalibrationGSU 25D/GMU 11MagnetometerCalibrationEngine Run-upVibrationTestGSU 25D was removed and reinstalled.The mounting bracket was NOT removed,and the mounting bracket bolts were NOTloosened. (same serial number)None Required.Continue to GSU 25D/GMU 11 Checkout ProceduresGSU 25D was removed and reinstalled.The mounting bracket WAS removedand/or mounting bracket bolts WEREloosened.X X XGSU 25D was replaced with new unit.(New serial number) X X X7.2.1.1 Pitch/Roll Offset Compensation by Aircraft LevelingNOTEPrior to performing the following procedure, the aircraft must be leveled using the procedures in theaircraft maintenance manual.Figure 7-1 – Aircraft Level AttitudeUse the following procedure to set GSU 25D pitch and roll compensation on the aircraft;1. Select the ADAHRS Calibration Page.2. Ensure that all the required status boxes are checked.3. Select Pitch/Roll Offset.4. Ensure that aircraft and ADAHRS comply with all on-screen instructions, then select the STARTbutton.5. “Pitch/roll offset calibration in progress” will appear on the display along with calibrationinformation.
