190-02246-11
GI 275 Part 23 AML STC Maintenance Manual
Rev. 1
Page 4-26
Figure 4-19 Terrain/TAWS Alert Message Troubleshooting
Terrain/TAWS
Alert Messages
TAWS not properly
configured
Check TAWS/Terrain
config settings
Verify External
TAWS and
GI 275 have the
same aircraft type
configured
If fault persists,
contact Garmin
No valid GPS position
Verify GPS is
powered and has a
clear view of sky
Verify Terrain
database coverage
Inspect GPS antenna
and wiring
GPS vertical position error
estimate over max allowed
Terrain data not available
(out of coverage area)
Cause
Cause
Cause
Maintenance
Log Message
TER FAIL
TER N/A
Corrective
Action
Corrective
Action
Corrective
Action
Database corrupted
or missing
Internal failure
Service TAWS.
Invalid Config
Terrain/TAWS
alerting
configuration not
selected
Verify Terrain
database is loaded
and current
Reload Terrain
database
Terrain not available
due to databases
Maintenance
Log Message
Terrain database
unavailable
Cause
Database
out-of-date or
corrupted
Corrective
Action
Reload or update
database
SVT not available
due to databases
Maintenance
Log Message
SafeTaxi database
unavailable
Cause
Database
out-of-date or
corrupted
Corrective
Action
Reload or update
database
Obstacle database
expired
Obstacle database
not yet effective
Maintenance
Log Message
Obstacle database
expired
Cause
Obstacle database
has expired
Corrective
Action
Update to the
current database
version
Maintenance
Log Message
Obstacle database
not yet effective
Cause
Preloaded database
is not yet activated
on the system
Corrective
Action
Activate databases:
follow system
prompts
SVT could not be
enabled
Maintenance
Log Message
SVT could not be
enabled
Cause
Terrain database
missing or
out-of-date
Corrective
Action
Bad feature
enablement
Verify Terrain
database is installed
and up-to-date
Re-download and
install SVT feature
enablement
