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Part Three: Section 3
TAWS Alerts
WARNING—The annunciation and pop-up terrain
alert are accompanied by the aural message “Pull
Up”.
Negative Climb Rate After Takeoff Alert (NCR)
The purpose of the Negative Climb Rate 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.
The “Don’t Sink” pop-up terrain alert accompanies the aural
message for the NCR alert. The aural message “Don’t Sink” or
“Too low, terrain” is issued also.
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
The NCR alerting parameters as defined by TSO-
C151b are shown in the Negative Climb Rate graph.
Altitude Loss (feet)
Height AboveTerrain (Feet)
0
0
20
40 60
80
100 120
140
200
400
600
800
1000
"DON'T SINK"
Negative Climb Rate (NCR) Graph