IFD500 Series Pilot Guide
Map Subsystem 4-43
Terrain less than 100
feet below aircraft
altitude, including
terrain above aircraft
altitude
Terrain less than 100
feet below aircraft
altitude, including
terrain above aircraft
altitude
When the aircraft is more than 3000 feet above any surrounding
terrain (1500 feet for helicopters), Terrain Awareness is turned off
automatically.
Terrain Awareness can also be triggered by obstacles as follows:
Obstacles between
1000 and 2000 feet
below aircraft altitude
Obstacles between
500 and 2000 feet
below aircraft altitude
Cyan threat
bubble over
the obstacle
Obstacles between
100 and 1000 feet
below aircraft altitude
Obstacles between
100 and 500 feet
below aircraft altitude
Yellow threat
bubble over
the obstacle
Obstacles less than
100 feet below aircraft
altitude, including
above aircraft altitude
Obstacles less than
100 feet below
aircraft altitude,
including above
aircraft altitude
Red threat
bubble over
the obstacle
Terrain Awareness coloring is inhibited in an area immediately
surrounding airports to allow for enhanced visual distinction of those
facilities. If the orientation of runways at the airport can be
determined, then the inhibited area will be based on the outlines of
the runways. Otherwise, coloring will be inhibited in a circular area
around the airport, including airports that have been designated as
an airfield (see page 3-59).
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