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10-15190-01004-03 Rev. B
Garmin GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
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.
"PULL UP""PULL UP"
"SINK RA
TE"
$ESCENT2ATE
Height Above Terrain (Feet)
Figure 10-12 Excessive Descent Rate Alert Criteria
10.3.8.3 Forward Looking Terrain Avoidance
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
TAWS Page.
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.