Display inhibit functions
If the TAWS computer determines that a view is unavailable, when selected the navigation
displays will be blank, making the loss of display self-annunciating. An appropriate message
will also be displayed. Gray areas on the terrain display will also be presented when the
terrain database lacks data for that area or region of the world.
Navigation display inhibited annunciations
Displayed Message Description
TERRAIN HEADING UNAVAILABLE No valid heading input.
TERRAIN TRACK UNAVAILABLE No valid track angle input.
TERRAIN POSITION UNAVAILABLE No valid position input.
TERRAIN ALTITUDE UNAVAILABLE No valid altitude input.
DISABLE RENDER TASK
TAWS discontinues providing a display
during a database load through the DTU or a
configuration through the RS-232 port or the
DTU.
RENDERING DISABLED NEAR POLES
TAWS discontinues providing a display while
navigating above 85 degrees latitude, North
or South.
TERRAIN DATABASE CORRUPTED
The CRC for the terrain database has failed.
This includes failures that occur during the
terrain database load process.
TERRAIN INHIBIT SELECTED
The flight crew has selected the TAWS
TERR INHIB switch.
MODE DATA UNAVAILABLE No valid mode data.
RANGE DATA UNAVAILABLE No valid range data.
INVALID MODE SELECTED
Current mode does not support display of
terrain data.
INVALID RANGE SELECTED
Current range does not support display of
terrain data.
Fokker 50 - Flight Navigation Instruments
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