IFD400 Series Pilot Guide
3-36 Map Subsystem
TERRAIN AWARENESS
Terrain Awareness is a graphical representation of aircraft height
above surrounding terrain and obstacles, shown as colored overlays
on the map. It is for general situational awareness purposes and is
not intended to be the sole means of terrain or obstacle avoidance.
T
errain Awareness is often abbreviated as “TA”, but that is avoided in
this document in order to prevent confusion with the same acronym
being used for “Traffic Alert”. Terrain Awareness is based on GPS
altitude, not baro corrected or radar altitude, and will not generate a
CAS message or aural alert.
Terrain Awareness
Terrain Awareness coloring can be triggered by terrain within a 10nm
radius of the aircraft and is displayed as follows, depending upon the
installation:
Fixed Wing Installation
Helicopter Installation
Displayed As
Terrain between 100
and 1000 feet below
aircraft altitude
Terrain between 100
and 500 feet below
aircraft altitude
Hatched
yellow
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
Hatched red
When the aircraft is more than 3000 feet above any surrounding
terrain (1500 feet for helicopters), Terrain Awareness is turned off
automatically.
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