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HAZARD AVOIDANCE
FIVE-HUNDRED AURAL ALERT
The purpose of the aural alert message "Five-hundred" is to provide an advisory alert 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.
NEGATIVE CLIMB RATE AFTER TAKEOFF ALERT (NCR)
The Negative Climb Rate (NCR) After Takeoff alert (also referred to as "Altitude Loss After Takeoff")
provides alerts when the system determines 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:
• Height above the terrain is less than 700 feet
• Distance from the departure airport is 2 nm or less
• Heading change from the departure heading is less than 110 degrees
Figures 6-80 and 6-81 show the NCR alerting parameters as defined by TSO-C151b.
1000
900
800
700
600
500
400
300
200
100
336
0
0
20
40
Figure 6-80 Negative Climb Rate (NCR) Altitude Loss
Garmin G1000 Pilot's Guide for the Diamond DA40/40F
"DON'T SINK"
or
"TOO LOW, TERRAIN"
60
80
100
120
Altitude Loss (Feet)
140
190-00592-06 Rev. A
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