Garmin G950 Pilot's Manual page 353

EXCESSIVE DESCENT RATE ALERT
The purpose of the Excessive Descent Rate (EDR) alert is to provide suitable notification when the
aircraft is determined to be closing (descending) upon terrain at an excessive speed. Figure 6-58 shows the
parameters for the alert as defined by TSO-C151b.
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
FORWARD LOOKING TERRAIN AVOIDANCE
The Forward Looking Terrain Avoidance (FLTA) feature of TAWS-B compares the aircraft' s projected flight
path with known terrain and obstacles in their respective databases and issues alerts as either a caution or a
warning:
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 Figure 6-59. When an RTC alert is issued, a potential impact point is displayed on the
TAWS-B 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-B Page. The alert is annunciated when
the projected vertical flight path is calculated to come within minimum clearance altitudes in Figure 6-59.
190-00870-02 Rev. A
0
Figure 6-58 Excessive Descent Rate Alert Criteria
Garmin G950 Pilot's Guide for the Pilatus PC-6
Warning: "PULL UP"
Descent Rate (FPM)
HAZARD AVOIDANCE
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