____________________________________________________________________
Page 7-12
G1000 System Maintenance Manual
Rev. A
190-00903-00
Table 7-1. GRS 77/GMU 44 Calibration
Calibration
Procedure
Required
Condition
A1 B
D
Removed or replaced the GRS 77 without loosening mounting rack bolts
None Required
Replaced the GRS 77 and loosened mounting rack bolts
X
X
X
Replaced the GRS 77 Configuration Module
X
X
X
Replaced the GMU 44 (new serial number)
X
GMU 44 was removed and reinstalled (same serial number)
None Required
Procedure A1: Pitch/Roll Offset Calibration
Figure 7-3. Pitch/Roll Offset
This procedure must be performed for both GRS 77 units installed in the aircraft. This procedure
must be carried out with the engine off.
1.
Level the aircraft (per aircraft manufacturer’s instructions) to within
±
0.25° of zero pitch and
zero roll.
2.
Initiate the AHRS Ground Pitch/Roll Aircraft Level compensation mode by performing the
following steps:
a.
Enter Configuration Mode and go to GRS/GMU CALIBRATION page as shown in
Figure 7-3.
b.
This page is protected and requires a keystroke password to perform the calibration.
Press the following softkeys in sequence:
1.
Softkey 9
2.
Softkey 10
3.
Softkey 11
4.
Softkey 12
