
Page 3-22 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
The GRS 77 and GDC 74A configuration modules function differently than the rest of the system. The
GDC 74A’s configuration file is loaded directly to GDC internal memory. A copy of the file is stored in
the GDC configuration module.
The GRS 77 configuration module does not store any configuration files. Instead, it stores calibration
data recorded during the installation calibration process.
GRS 77
AHRS
GRS 77 Config Module
(Located in GRS backshell connector)
Stores a copy of AHRS/Magnetometer calibration
values that are recorded upon completion of
post-installation calibration procedures.
The GRS 77 stores calibration data internally.
The GRS 77 also stores factory calibration data internally.
Should internal memory or the configuration module fail,
AHRS ouput data flags invalid.
GRS Internal Memory
Contains internal sensor calibration data that is
not installation-specific. Data is stored from
factory calibrations.
GDC 74A
Air Data Computer
GDC 74A Config Module
(Located in GDC backshell connector)
Stores a copy of the GDC 74A configuration file.
The GDC 74A stores the GDC1 configuration file internally.
The GDC 74A also stores factory calibration data internally.
Should internal memory or the configuration module
fail, loss of some or all airdata outputs will result.
GDC Internal Memory
Contains internal sensor calibration data that is
not installation-specific. Data is stored from
factory calibrations.
Figure 3-19. GRS/GDC Configuration Settings Storage
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