Garmin G1000 Mooney M20TN - Manual (Page 289)

190-00647-00 Rev. A Garmin G1000 Pilot’s Guide for the Mooney M20M/M20R/M20TN 6-53
HAZARD AVOIDANCE
Figure 6-57 shows the NCR alerting parameters as defined by TSO-C151b.
Figure 6-57 Negative Climb Rate (NCR) Alert Criteria
‘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 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.
TAWS NOT AVAILABLE ALERT
TAWS requires a 3D 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 also generated. When the GPS signal is re-established, the aural message “TAWS Available” is
generated.