35
Part Three: Section 2
TAWS Operation
TAWS Symbols
The symbols and colors in the following figure and
table are used to represent obstacles and potential impact
points on the TAWS Page. TAWS uses yellow (caution)
and red (warning) to depict terrain information relative
to aircraft altitude. Each color is associated with an alert
severity level. Terrain graphics and visual annunciations
also use these color assignments.
Note that obstacle symbols are shown on display
zoom ranges up to 10 NM.
Potential Impact Point
Unlighted Obstacle
Projected Flight Path
1000 ft
100 ft Threshold
Terrain more than 1000 ft below the aircraft altitude (Black)
Terrain between 100 ft and 1000 ft below the
aircraft altitude (Yellow)
Terrain above or
within 100 ft
below the aircraft
altitude (Red)
Terrain Altitude/Color Correlation for Terrain Proximity
Unlighted Obstacle
Lighted Obstacle
Potential
Impact
Points
Terrain
Color
Terrain/Obstacle Location Alert Level
< 1000 ft
AGL
> 1000 ft
AGL
< 1000 ft
AGL
> 1000 ft
AGL
Obstacle Symbol
Red
Terrain/Obstacle at or within
100 ft below current aircraft
altitude
WARNING
(Red)
Yellow
Terrain/Obstacle between
100 ft and 1000 ft below
current aircraft altitude
CAUTION
(Yellow)
TAWS Terrain/Obstacle Colors and Symbology
NOTE
: If an obstacle and the projected flight
path of the aircraft intersect, the display auto-
matically zooms in to the closest potential point
of impact on the TERRAIN Page.
190-00356-30 Rev C
Summary of Contents for GDL 69A
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