Garmin HTAWS User Guide - Page 48

Part Three: Section 3 TAWS Alerts "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 generated. There are no display annunciations or pop-up alerts that accompany the aural message. TAWS Not Available Alert Garmin TAWS requires a 3-D GPS navigation solution 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 "TER N/A" is generated in the annunciation window. When the GPS signal is re-established and the aircraft is within the database coverage area, the "TER N/A" annunciation is removed. No GPS Position 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 issued along with the "TER FAIL" annunciation. "TERRAIN NOT AVAILABLE" Display TAWS FAILED Display TAWS Alert Summary The aural alert voice gender is configurable to be either male or female. Also, there are different alert text phrases available for several of the alerts, as shown below. See your Garmin installer for further information on configuring the alert system. Position Outside Terrain Database Coverage 42 190-00356-30 Rev H