____________________________________________________________________
Page 5-16
G1000 System Maintenance Manual
Rev. A
190-00903-00
SELECT UNIT—MFD
ARINC 429 WINDOW
Channel LRU Indicator
Status/Recommended
Action
MFD/GRS 77 #1 data path is functioning correctly.
MFD/GRS 77 #1 data path is not functioning correctly.
•
Check PFD1 Alert Window for MFD or GRS
configuration or software error messages. Correct
any errors before proceeding.
•
Verify GRS77 #1 status is OK using the AUX -
SYSTEM STATUS PAGE on the MFD. If it has a
Red-X, troubleshoot why the GRS is offline before
proceeding.
•
Ensure GRS connecter is secure and proper wire
harness strain relief is provided.
•
Swap GRS1 and GRS2 (if a GRS2 is installed) to
confirm if the problem is in the original GRS1.
−
Replace original GRS1 if box turns green after
swapping units.
•
Swap MFD and PFD1 (if the same P/N) to confirm if
the problem is in the original MFD.
−
Replace original MFD if box turns green after
swapping displays.
•
Check the MFD/GRS 77 #1 interconnect wiring and
unit connector pins for faults.
a.
Replace GRS 77 #1.
IN 1
GRS 77 #1
MFD/GRS 77 #1 data path functionally is unknown.
Reload MFD configuration file.
