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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