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Figure 6-59 shows two figures which illustrate the NCR alerting parameters as defined by TSO-C151b.
The NCR alert is issued when the altitude loss and height are within the range in the first figure, or when
the sink rate (negative vertical speed) and height are within the range in the second figure.
'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.
190-00692-00 Rev. B
1000
800
600
400
200
0
20
40
60
Altitude Loss (Feet)
1000
900
800
700
600
500
400
300
200
100
0
500
1000
1500
Sink Rate (Feet Per Minute)
Figure 6-59 Negative Climb Rate (NCR) Alert Criteria
Garmin G1000 Pilot's Guide for Piper PA32
"DON'T SINK"
"DON'T SINK"
80
100
120
"DON'T SINK"
"DON'T SINK"
2000
2500
3000
3500
HAZARD AVOIDANCE
140
4000
6-57
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