CHAPTER 4 REFERENCE GUIDE
EFD1000 PRO MAX PFD Pilot’s Guide
Page 4-88
091-00005-002 ()
4.10.6 Terrain Warning System – TWS
The Aspen Terrain Warning System (TWS) is included with the Evolution Synthetic Vision
System to provide simple and effective terrain and obstacle alerting. To enhance the
pilot’s situational awareness of a potential terrain/obstacle collision, the Terrain Warning
System employs the following TWS Alerts (Figure 4-139):
• Terrain Coloring
• FPM Coloring
• Caution/Warning Text Annunciations, and
• Aural/Audio Alerts
4.10.6.1 Terrain Coloring
When the aircraft is close to the ground, the terrain and obstacles displayed in Synthetic
Vision and on the SV3 moving map change color. The terrain and tops of obstacles
ahead show yellow when within 500 feet of the aircraft and red when within 100 feet.
Red and yellow coloring are used for visual terrain awareness and alerting. This terrain
coloring represents the relative terrain elevation compared to the aircraft’s altitude.
Enroute terrain that is between 100 and 500 feet below the aircraft is shown as yellow.
The terrain that is less than 100 feet below the aircraft and above is shown as red
(Figure 4-140).
Figure 4-139
Terrain Warning System VIEW
Figure 4-140
Terrain Coloring VIEW
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