10-62
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Terrain
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
2000
4000 6000 8000 10000
12000
"SINK R
ATE"
Descent Rate
Height Above Terrain (Feet)
"PULL UP"
Figure 10-41 Excessive Descent Rate Alert Criteria
10.8.5.4 Forward Looking Terrain Avoidance
Reduced Required Terrain Clearance (RTC)
Reduced Required Line
Clearance (RLC),
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, RLC, and/or a ROC alert is
issued, a threat location indicator is displayed on the TAWS Page.
Imminent Terrain Impact (ITI), Imminent Line Impact (ILI),
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, ILI,
and IOI alerts are accompanied by a threat location indicator 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.
Summary of Contents for GTN 625
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