Garmin G1000 Pilot's Manual page 304

HAZARD AVOIDANCE
EXCESSIVE DESCENT RATE ALERT
The purpose of the Excessive Descent Rate (EDR) alert is to provide suitable notification when the aircraft is
determined to be closing (descending) upon terrain at an excessive speed. Figure 6-55 shows the parameters
for the alert as defined by TSO-C151b.
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 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.
6-52
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Figure 6-55 Excessive Descent Rate Alert Criteria
Garmin G1000 Pilot's Guide for Cessna Nav III
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190-00498-01 Rev. A