Garmin GNC 420AW Pilot's Manual

Also see for GDL 69: Pilot's guide addendum Pilot's guide addendum Activation Instructions Activation Instructions Pilot's guide addendum

Contents

Garmin GNC 420AW Pilot's Manual Manual pdf 46 page image

40Part Three: Section 3TAWS AlertsExcessive Descent Rate Alert (EDR)The purpose of the Excessive Descent Rate alertis to provide suitable notification when the aircraft isdetermined to be closing (descending) upon terrainat an excessive speed. The parameters for the alert asdefined by TSO-C151b are shown in the Descent Rategraph. "PULL UP""PULL UP""SINK RATE"$ESCENT2ATEHeight Above Terrain (Feet)Excessive Descent Rate GraphExcessive Descent Rate Severity LevelsCAUTION—The annunciation and pop-up terrain alertare accompanied by the aural message “Sink Rate”.WARNING—The annunciation and pop-up terrain alertare accompanied by the aural message “Pull Up”.Negative Climb Rate After Takeoff Alert (NCR)The purpose of the Negative Climb Rate AfterTakeoff alert (also referred to as “Altitude Loss AfterTakeoff”) is to provide suitable alerts to the pilotwhen the system determines that the aircraft is losingaltitude (closing upon terrain) after takeoff. Theaural message “Don’t Sink” is given for NCR alerts,accompanied by an annunciation and a pop-up terrainalert on the display.NCR alerting is only active when departing from anairport 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 orless• The heading change from the heading at the time ofdeparture is less than 110 degreesThe NCR alerting parameters as defined byTSO-C151b are shown in the Negative Climb RateAlert Criteria figures below. The NCR alert is issuedwhen the altitude loss and height are within the rangein the first figure, or when the sink rate (negativevertical speed) and height are within the range in thesecond figure.190-00356-30 Rev H