11-15190-01007-03 Rev. C
GTN 725/750 Pilot’s Guide
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Appendix
Index
11.3.8.2 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.
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
2000 4000 6000 8000 10000 12000
"PULL UP""PULL UP"
"SINK RA
TE"
Descent Rate
Height Above Terrain (Feet)
Figure 11-12 Excessive Descent Rate Alert Criteria
11.3.8.3 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.
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