Taws Not Available Alert; Symbols; Taws Failure Alert; Taws System Status - Garmin GTN 750 Pilot's Manual

11.3.8.8

TAWS Not Available Alert

TAWS requires a 3-D GPS position solution along with specific vertical
accuracy minimums. Should the position solution become degraded or if the
aircraft is out of the database coverage area, the annunciation "TAWS N/A" is
generated in the annunciation window and on the TAWS page. The aural message
"TAWS Not Available" is generated. When the GPS signal is re-established and
the aircraft is within the database coverage area, the aural message "TAWS
Available" is generated (when the aircraft is airborne).
11.3.8.9

TAWS Failure Alert

TAWS continually monitors several system-critical items such as database
validity, hardware status, and GPS status. If the terrain/obstacle database is not
available, the aural message "TAWS System Failure" is generated along with a
"TAWS FAIL" annunciation.
11.3.9

TAWS System Status

During power-up, TAWS conducts a self-test of its aural and visual
annunciations. The system test can also be manually initiated. An aural alert is
issued at test completion. TAWS System Testing is disabled when ground speed
exceeds 30 knots.
Alert Type
TAWS Available
TAWS System Test in Progress
TAWS System Test Pass
TAWS N/A
TAWS Alerting is Disabled
TAWS System Test Fail
Table 11-5 TAWS-B System Test Status Annunciations
190-01007-03 Rev. B
Alert
Annunciation
None
None
Garmin GTN 725/750 Pilot's Guide
Aural Message
"TAWS Available"
None
"TAWS System Test OK"
TAWS Not Available
None
"TAWS System Failure"
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Appendix

11-19
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