Garmin G1000 Pilot's Manual page 278

HAZARD AVOIDANCE
NEGATIVE CLIMB RATE AFTER TAKEOFF ALERT (NCR)
The purpose of the Negative Climb Rate (NCR) After Takeoff alert (also referred to as 'Altitude Loss After
Takeoff') is to provide suitable alerts to the pilot when the system determines that the aircraft is losing altitude
(closing upon terrain) after takeoff. The aural message "Don't Sink" is given for NCR alerts, accompanied by
an annunciation and a pop-up terrain alert on the display. NCR alerting is only active when departing from
an airport and when the following conditions are met:
• The height above the terrain is less than 700 feet.
• The distance from the departure airport is 2 nm or less.
• The heading change from the heading at the time of departure is less than 110 degrees.
Figure 6-58 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 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.
6-46
Figure 6-52 Negative Climb Rate (NCR) Alert Criteria
Garmin G1000 Pilot's Guide for the Diamond DA40/40F 190-00592-02 Rev. A