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Page 4-2
GNS 400W Series Maintenance Manual
Rev. A
190-00356-05
NOTE
If the unit fails any of the power-up integrity checks, a ‘Fatal Error Page’ fault
message is displayed. Return the unit for service if this occurs.
Table 4-1. Fault Messages and Recommended Actions
FAULT MESSAGE
MESSAGE EXPLANATION
RECOMMENDED ACTIONS
All Data Referenced to True
North
N/A
Verify that a Jeppesen
NAVData® card is fully
inserted into the left card slot.
Replace the Jeppesen
NAVData® card.
Check the applicable flex
cable.
Replace the CDU assembly.
Return the unit for service.
Airport terrain database
integrity error
The unit has detected a
problem with a database on
the TAWS/Terrain data card.
The data is not usable.
Replace the card.
Altitude input failure
N/A
Return the unit for service.
Audio database integrity error The unit has detected a
problem with the built-in
TAWS audio database.
TAWS audio alerts are not
available.
Return the unit for service.
Aviation database integrity
error
The unit has detected a
problem with a database on
the NAVData® card. The data
is not usable.
Return the card to Garmin.
Basemap database integrity
error
The unit has detected a
failure in the built-in basemap
(land data) database. Land
data does not appear. Unit
functions continue to work
normally.
Return the unit for service.
Boot block verify failed
System integrity testing has
determined that the boot
block has become corrupted.
Return the unit for service.
CDI key stuck
N/A
Check the applicable flex
cable.
Replace the keyboard.
Replace the CDU.
Return the unit for service.