Garmin HTAWS User Guide - Page 46

Part Three: Section 3 TAWS Alerts Excessive Descent Rate Alert (EDR) The purpose of the Excessive Descent Rate alert is to provide suitable notification when the aircraft is determined to be closing (descending) upon terrain at an excessive speed. The parameters for the alert as defined by TSO-C151b are shown in the Descent Rate graph.    Height Above Terrain (Feet)    "SINK RATE"      "PULL UP"   $ESCENT2ATE Excessive Descent Rate Graph Excessive Descent Rate Severity Levels 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. 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. CAUTION-The annunciation and pop-up terrain alert are accompanied by the aural message "Sink Rate". 40 190-00356-30 Rev H