Garmin GTX GTX 330D Pilot's Manual Addendum - Page 45
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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.
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 Alert
Criteria figures below. 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.
Negative Climb Rate (NCR) Alert Criteria
190-00356-30 Rev C
Part Three: Section 3
TAWS Alerts
41