Garmin Software Version 0321.23 Manual Pagina 163

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G1000 System Maintenance Manual – Diamond DA40/40F Page 5-31
190-00545-01 Revision G
GRS 77 Backup Path Description:
The GRS 77 AHRS has 4 redundant communication paths which are capable of supplying ARINC 429
attitude and heading information to the PFD and MFD. The primary path is the ARINC 429 bus between
the GRS 77 and the PFD. The secondary backup path is the ARINC 429 bus input to the MFD. The
tertiary backup path inputs ARINC data to GIA1, where it is then sent over HSDB to the PFD. The last
backup path inputs ARINC data to GIA2, where it is then sent over HSDB to the MFD. AHRS data is
then cross-filled to the appropriate display.
GRS 77
ARINC 429
GRS 77
GRS 77
GRS 77
ETHERNET
ETHERNET
ETHERNET
ETHERNET
ARINC 429
ETHERNET
ETHERNET
ARINC 429
ARINC 429
No. 1
No. 2
GIA 63
GIA 63
Primary Data Path
Secondary Data Path
Third Data Path
Fourth Data Path
GDU 1040
PFD
GDU 1040
MFD
GDU 1040
MFD
GDU 1040
MFD
GDU 1040
MFD
GDU 1040
PFD
GDU 1040
PFD
GDU 1040
PFD
Figure 5-13. GRS 77 Data Paths
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