Htaws Not Available Alert; Htaws Failure Alert; Htaws Alert Summary - Garmin GNC 420AW Pilot's Manual

Part Four: Section 3
HTAWS Alerts

HTAWS Not Available Alert

Garmin HTAWS requires a 3-D GPS navigation so-
lution along with specific vertical accuracy minimums.
Should the navigation solution become degraded, or
if the aircraft is out of the database coverage area, the
annunciation "TAWS N/A" is generated in the annun-
ciation window. When the GPS signal is re-established
and the aircraft is within the database coverage area,
the "TAWS N/A" annunciation is removed.
"TAWS NOT AVAILABLE" Display
Position Outside Terrain Database Coverage
56

HTAWS Failure Alert

HTAWS 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 "HTAWS System Failure" is
issued along with the "TAWS FAIL" annunciation.

HTAWS Alert Summary

The aural alert voice gender is configurable to be
either male or female. See your Garmin installer for
further information on configuring the alert system.
190-00356-30 Rev H
No GPS Position
HTAWS FAILED Display