10-56
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Terrain
10.8.5 TAWS-A Alerts
Alerts are issued when flight conditions meet parameters that are set
within TAWS-A software algorithms. TAWS-A alerts employ a CAUTION or a
WARNING alert severity level. When an alert is issued, visual annunciations are
displayed and aural alerts are simultaneously issued. TAWS-A alert types with
corresponding annunciations and aural messages are shown in Table 10-9.
When an alert is issued, annunciations appear on the display. The TAWS-A
Alert Annunciation is shown on the lower left part of the display. If the TAWS-A
Page is not already displayed, a pop-up alert appears while an alert is active.
Blinking Alert
Touch to Display
Terrain Page
Touch to Remove
Pop-Up and Remain
on Current Page
TAWS Annunciation
Figure 10-40 Terrain Alert Pop-Up
To acknowledge the pop-up alert:
Touch the
Close
key (returns to the currently viewed page)
OR
Touch the
Go to Terrain
key (accesses the TAWS-A Page)
10.8.5.1 TAWS-A Alert Types
TAWS-A provides the following alert types:
• Forward Looking Terrain Avoidance (FLTA) Alerting, which consists of:
- Required Terrain Clearance (RTC) / Required Line Clearance (RLC) /
Required Obstacle Clearance (ROC) Alerting
- Imminent Terrain Impact (ITI) / Imminent Line Impact (ILI) /
Imminent Obstacle Impact (IOI) Alerting
• Premature Descent Alerting (PDA)
• Ground Proximity Warning System (GPWS) Alerting, which consists of:
- Excessive Descent Rate (EDR) Alerting
- Excessive Closure Rate (ECR) to Terrain Alerting
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