System Maintenance Manual

G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 7-19
190-00716-01 Revision 1
7.7.1 GRS/GMU Calibration Procedures
GRS/GMU Recalibration Criteria
The following calibration procedures are provided for the GRS 77 and GMU 44:
• Pitch/Roll Offset: (Procedure A1, PROVIDED IN SECTION 7.7.2)
• Magnetometer Calibration: (Procedure B, PROVIDED IN SECTION 7.7.4)
• Engine Run-Up Vibration Test: (Procedure D, PROVIDED IN SECTION 7.7.5)
• Magnetometer Interference Test: (Procedure E, PROVIDED IN SECTION 5.15.4)
When ready to perform the procedures, shut the PFDs and MFD off by pulling the PFD and MFD circuit
breakers. Restart all displays in configuration mode. Follow the steps given for each procedure on-
screen at the GRS/GMU CALIBRATION page. Note that the CALIBRATE command cannot be
selected and activated until the installer acknowledges all required steps have been carried out by
pressing the ENT key on each step.
Table 7-7, Required GRS/GMU Calibrations
Condition
Calibrations Required
Procedure A1:
GRS 77
Pitch/Roll
Offset
Procedure B:
GRS/GMU
Magnetic
Calibration
Procedure D:
Engine Run-up
Vibration
Test
Either GMU 44 was removed and
reinstalled. (no change in serial number)
None Required.
Continue to GRS/GMU Test section.
GMU 44 was replaced with new unit.
(New serial number)
X
GRS 77 AHRS was removed and/or
replaced. The mounting tray was NOT
removed and the mounting tray bolts were
NOT loosened.
None Required.
Continue to GRS/GMU Test section.
GRS 77 AHRS was removed and/or
replaced. The mounting tray WAS removed
and/or mounting tray bolts WERE loosened.
X X X
GRS 77 AHRS Configuration Module was
replaced.
X X X