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Part Four: Section 2
HTAWS Operation
HTAWS Symbols
The symbols and colors in the following figures and table are used to represent obstacles and potential impact points on the
HTAWS Page. Each color is associated with a height above terrain.
The zoom range of obstacles (on the TAWS and NAV pages) is controlled by the NAV map’s “Setup Map” menu option
in the “Terrain” group under the “Obstacles” option. Obstacles can be shown up to the maximum zoom range on the TAWS
page. However, obstacles are ALWAYS shown on the TAWS page at 10 NM and below.
NOTE
: If an obstacle or terrain cell and the projected flight path of the aircraft intersect, the display automatically zooms in to
the closest potential point of impact on the HTAWS Page.
Terrain more than 500 ft
below the aircraft altitude
Terrain is between 0 ft and 250 ft
below the aircraft altitude
Terrain is more than 250 ft
above the aircraft altitude
Terrain is between 250 ft and 0 ft
above the aircraft altitude
Aircraft Altitude -250 ft
Terrain is between 250 ft and 500 ft
below the aircraft altitude
Aircraft Altitude +250 ft
Aircraft Altitude -500 ft
Aircraft Altitude
Red
Orange
Yellow
Green
Black
HTAWS Terrain Altitude Colors and Symbology
Unlighted Obstacle
Lighted Obstacle
Obstacle
Color
Obstacle Location
< 1000 ft
AGL
> 1000 ft
AGL
< 1000 ft
AGL
> 1000 ft
AGL
Obstacle Symbol
Red
Obstacle is at or above current aircraft altitude
Yellow
Obstacle is between 250 ft and 0 ft below current aircraft
altitude
White
Obstacle is 250 ft, or more, below current aircraft altitude
HTAWS Obstacle Colors and Symbology
190-00356-30 Rev H
