Garmin G2000 Pilot's Manual page 432

Hazard avoidance
EXCESSIVE DESCENT RATE ALERT
The purpose of the Excessive Descent Rate (EDR) alert is to provide notification when the aircraft is
determined to be closing (descending) upon terrain a rate that is calculated to be excessive relative to height
above terrain. Figure 6-94 shows the parameters for the alert as defined by TSO-C151b.
6000
5500
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0
FORWARD LOOKING TERRAIN AVOIDANCE (FLTA)
The Forward Looking Terrain Avoidance (FLTA) feature of TAWS compares the projected flight path as
derived from GPS data with terrain features and obstacles from the terrain and obstacle databases. The system
issues visual annunciations and voice alerts when the projected flight path conflicts with terrain or obstacles.
The projected flight path is a calculated area ahead of, to the sides, and below the aircraft. The size of
the projected flight path varies based on factors including ground speed (the path ahead is larger when the
ground speed is higher), whether the aircraft is level, turning, or descending, and the proximity to the nearest
runway along the current track. As the aircraft approaches the runway, the projected flight path becomes
narrower until the system automatically disables FLTA alerts or the pilot manually inhibits them.
There are two types of FLTA alerts, Reduced Required Terrain/Obstacle Clearance (RTC or ROC respectively)
and Imminent Terrain/Obstacle Impact (ITI or IOI respectively).
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 6-95. When an RTC alert is issued, the system shows a potential impact point on
maps with relative terrain display enabled.
Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) alerts are issued when the
aircraft is below the elevation of a terrain or obstacle in the aircraft' s projected path. ITI and IOI alerts are
accompanied by a potential impact point displayed on maps with relative terrain display enabled. The alert is
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Warning: "PULL UP"
Descent Rate (FPM)
Figure 6-94 Excessive Descent Rate Alert Criteria
Garmin G2000 Pilot's Guide for the Cessna T240
190-01263-01 Rev. A