Garmin G1000 Pilot's Manual page 305

Figure 6-56 shows the NCR alerting parameters as defined by TSO-C151b.
'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 500 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
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
'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.
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.
190-00498-01 Rev. A
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Figure 6-56 Negative Climb Rate (NCR) Alert Criteria
Garmin G1000 Pilot's Guide for Cessna Nav III
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HAZARD AVOIDANCE
6-53