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Part Three: Section 3

TAWS Alerts

"Five-Hundred" Aural Alert

The purpose of the aural alert message "Five-Hun-

dred" 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.

Garmin TAWS requires a 3-D GPS navigation solu-

tion along with specific vertical accuracy minimums.

Should the navigation solution become degraded, or if

the aircraft is out of the database coverage area, the an-

nunciation "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.

"TERRAIN NOT AVAILABLE" Display

TAWS continually monitors several system-critical

items, such as database validity, hardware status, and

GPS status. If the terrain/obstacle database is not avail-

able, the aural message "TAWS System Failure" is issued

along with the "TER FAIL" annunciation.

Figure 13-11: TAWS FAILED Display

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 informa-

tion on configuring the alert system.

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