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GPS 500 Pilot’s Guide and Reference

11-9

SECTION 11

TAWS

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 condi-

tions 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 11-9 shows two gures which illustrate the NCR alerting parameters as dened by TSO-C151b. The NCR alert

is issued when the altitude loss and height are within the range in the rst gure, or when the sink rate (negative vertical

speed) and height are within the range in the second gure.

1000

800

600

400

200

Height Above Terrain (Feet)

Altitude Loss (Feet)

0 20 40 60 80 100 120 140

“DON’T SINK”“DON’T SINK”

1000

900

800

700

600

500

400

300

200

100

Height Above Terrain (Feet)

Sink Rate (Feet Per Minute)

“DON’T SINK”“DON’T SINK”

50010001500250035002000 3000 4000

Figure 11-9 Negative Climb Rate (NCR) Alert Criteria

190-00181-60 Rev. G

1 2 ... 180 181 182 183 184 185 186 187 188 189 190 ... 255 256

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