__________________________________________________________________
MFD ARINC 429
Channel
LRU
IN 1
GRS 77 #1
GDC 74A
IN 2
#1
Page 5-14
Rev. B
Indicator
MFD/GRS 77 data path is functioning correctly.
MFD/GRS 77 data path is not functioning correctly.
•
Check PFD Alert Window for MFD or GRS77
configuration or software error messages. Correct any
errors before proceeding.
•
Verify GRS77 status is OK using the AUX – SYSTEM
STATUS PAGE on the MFD. If it is has a Red-X,
troubleshoot why the GRS is offline before proceeding.
•
Ensure GRS77 connecter is secure and proper wire
harness strain relief is provided.
•
Swap PFD and MFD to confirm if the problem is in the
MFD.
−
Replace original MFD if box turns green after
swapping displays.
•
Check the MFD/GRS 77 interconnect wiring and unit
connector pins for faults.
•
Replace GRS 77
MFD/GRS 77 data path functionality is unknown. Reload
MFD configuration file.
MFD/GDC 74A data path is functioning correctly
MFD/GDC 74A data path is not functioning correctly.
•
Check PFD Alert Window for PFD or GDC74
configuration or software error messages. Correct any
errors before proceeding.
•
Verify GDC 74 status is OK using the System Status
Page on the MFD. If it has a Red-X, troubleshoot why
the GDC is offline before proceeding.
•
Swap PFD and MFD to confirm if the problem is in the
original MFD.
−
Replace original MFD if box turns green after
swapping displays.
•
Check the MFD/GDC 74 interconnect wiring and unit
connector pins for faults.
•
Replace GDC 74 if problem remains.
MFD/GDC 74A data path functionality is unknown. Reload
MFD configuration file.
Status
G1000 System Maintenance Manual
190-00907-00