400/500 Series Garmin Optional Displays

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Section 3
TAWS Alerts
Figure 3-7: ‘TERRAIN FAILED’ Display
Figure 3-8: ‘TERRAIN NOT AVAILABLE’ Display
‘Five-Hundred’ Aural Alert
The purpose of the aural alert message ‘Five-hundred’ is to provide an advisory alert to the pilot that
the aircraft is five-hundred feet above terrain. When the aircraft descends within 500 feet of terrain, the
aural message ‘Five-hundred’ is heard. There are no display annunciations or pop-up alerts that accompany
the aural message.
TAWS Failure Alert
TAWS system continually monitors several system-critical items, such as database validity, hardware
status, and GPS status. Should the system detect a failure, the TAWS Page displays “TERRAIN FAILED”
in yellow (Figure 3-7). The aural message ‘TAWS System Failure’ is issued along with the “TER FAIL”
annunciation.
TAWS Not Available Alert
Garmin TAWS requires a 3D GPS navigation solution along with specific vertical accuracy minimums.
Should the navigation solution become degraded, if the terrain/obstacle database is not available, or if
the aircraft is out of the database coverage area, the annunciation ‘TER N/A’ is given in the annunciation
window. Text is displayed on the TAWS Page as depicted in Figure 3-8. The aural message “Terrain Not
Available” is issued along with the ‘TER N/A’ annunciation.