Excessive Descent Rate Alert; Appendix; Forward Looking Terrain Avoidance - Garmin GTN 725 Pilot's Manual

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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

Figure 11-12 Excessive Descent Rate Alert Criteria

Reduced Required Terrain Clearance (RTC) and Reduced Required

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

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

Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI)

alerts are issued when the aircraft is below the elevation of a terrain or obstacle

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

when the projected vertical flight path is calculated to come within minimum

clearance altitudes in the following table.

190-01007-03 Rev. D

Descent Rate

Garmin GTN 725/750 Pilot's Guide

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