Garmin Software Version 0321.23 Manual Pagina 162

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Page 5-30 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
GDC 74A Backup Path Description:
The GDC 74A Air Data Computer has 4 redundant communication paths which are capable of supplying
ARINC 429 air data information to the PFD and MFD. The primary path is the ARINC 429 bus between
the GDC 74A 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. The air data is
then cross-filled to the appropriate display.
GDC 74A
ARINC 429
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
GDC 74A
GDC 74A GDC 74A
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
Figure 5-12. GDC 74A Data Paths
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