Figure 4-22 Nav Alert Message Troubleshooting - Garmin GI 275 Maintenance Manual

NAV <1/2>
inoperative
Maintenance
Log Message
NAV <1/2> interface/unit
failed. Check NAV unit or
wiring.
Cause
NAV source has lost
communication
Corrective
Action
Verify NAV source
is on and not
reporting failed
Verify configuration
settings
Inspect NAV wiring
and connections
190-02246-11
Rev. 1
Navigation
database mismatch
Maintenance
Log Message
Navigation
database mismatch
Cause
NAV source is Multiple GI 275 units
reporting failed have different NAV
database expirations
Corrective Corrective
Action Action
Troubleshoot in Update databases
accordance with across all units to
NAV unit the same date
maintenance
manual
Verify configuration
settings
Inspect NAV wiring
and connections

Figure 4-22 NAV Alert Message Troubleshooting

NAV/GPS Alert
Messages
Navigation database not Navigation
yet effective database expired
Maintenance Maintenance
Log Message Log Message
Navigation Navigation
database not yet database expired
effective
Cause Cause
Preloaded database Navigation
is not activated on database has
the system expired
Corrective Corrective
Action Action
Activate databases: Update to the
Follow system current database
prompts version
GPS <1/2>
inoperative
Maintenance
Log Message
GPS <1/2> interface
failed
Cause
GPS source has
lost communication
GPS source is
reporting failed
Corrective
Action
Verify GPS source is ON and
has a clear view of the sky
Verify configuration settings
Inspect GPS antenna, wiring
and connections
If fault persists,
contact Garmin.
GI 275 Part 23 AML STC Maintenance Manual
Page 4-30