Garmin GTN 650 Pilot's Guide - Page 195

10.3.8.2 Excessive Descent Rate Alert The purpose of the Excessive Descent Rate (EDR) alert is to provide notification when the aircraft is determined to be descending upon terrain at an excessive rate. The parameters for the alert as defined by TSO-C151b are shown below.  Foreword Getting Started Xpdr Ctrl  Com/Nav Height Above Terrain (Feet)  FPL    "SINK RATE" Direct-To Proc   Wpt Info  Map   "PULL UP" Traffic  10.3.8.3  $ESCENT2ATE Figure 10-12 Excessive Descent Rate Alert Criteria Forward Looking Terrain Avoidance Terrain Weather Nearest Reduced Required Terrain Clearance (RTC) and Reduced Required Music Obstacle Clearance (ROC) alerts are issued when the aircraft flight path is above terrain, yet is projected to come within the minimum clearance values in Utilities the FLTA Alert Minimum Terrain and Obstacle Clearance Values table. When an RTC alert and/or a ROC is issued, a potential impact point is displayed on the System TAWS Page. Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) Messages alerts are issued when the aircraft is below the elevation of a terrain or obstacle Symbols cell in the aircraft's projected path. ITI and IOI alerts are accompanied by a potential impact point displayed on the TAWS Page. The alert is annunciated Appendix when the projected vertical flight path is calculated to come within minimum clearance altitudes in the following table. Index 190-01004-03 Rev. B Garmin GTN 625/635/650 Pilot's Guide 10-15