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R  During a terrain warning alert, areas where terrain violates 
R  the terrain warning envelope along the aircraft track, and 
R  within plus or minus 90 deg. of the aircraft track, are 
R  displayed with the warning color 100 per cent red. 
R  NOTE : - Terrain is displayed on ND's if the ARC or ROSE mode____ 
R  is selected on the FCU. 
R  - When an alert (caution or warning) occurs and the FCU 
R  mode is not a correct mode (ARC or ROSE), the message 
R  TERR. CHANGE MODE is displayed on ND's. 
R  - When an alert (caution or warning) occurs and the 
R  range selected on the FCU is 160 or 320 NM the message 
R  TERR. REDUCE RANGE is displayed on ND's. 
R  (e) Terrain Data Base 
R  (Ref. Fig. 016A) 
R  Local terrain processing extracts and formats local topographic 
R  terrain data from the Enhanced GPWS terrain data base for use by 
R  the terrain threat detection and display processing functions. 
R  This terrain data base divides the earth surface into grid sets 
R  referenced horizontally on the geographic (latitude/longitude) 
R  coordinate system of the WGS-84. Elements of the grid sets record 
R  the highest terrain altitude (above MSL) in that element 
R  respective area. Grid sets vary in resolution depending on 
R  geographic location. Higher resolution grids are used around 
R  airports. Lower resolution grids are used outside airport areas 
R  where aircraft enroute altitude makes hazardous conditions 
R  unlikely and for which detailed terrain features are not 
R  important to the flight crew. 
R  Digital Elevation Models (DEM) are available for most of the 
R  airports around the world today. In cases where the data are not 

R 1EFF : 401-499, 1 34-48-00Page A36 1 1 Config-1 Aug 01/05 1 1 1CES 1

R  currently available, DEMs are generated in-house from available 
R  topographic maps, sectional charts, and airline approach plates. 
R  The process of acquiring, generating, assembling, and updating 
R  the data base is governed by strict configuration controls to 
R  ensure the highest level of data integrity. DEMs from external 
R  sources are input to this process, and are checked and formatted 
R  for generation of the Enhanced GPWS terrain data base. 
R  The global Enhanced GPWS terrain data base is organized in a 
R  flexible manner. Using digital compression techniques, the 
R  complete data base is stored in non-volatile memory within the 
R  Enhanced GPWC. Updates and additions are easily accomplished by 
R  inserting a single PCMCIA card in the card slot on the face of 
R  the Enhanced GPWC. Status LEDs on the face of the Enhanced GPWC 
R  allow the operator to monitor the data base load progress and 
R  completion. 
R  (f) Obstacle database (option) 
R  The obstacle database is included with the terrain database in 
R  the terrain database PCMCIA card. Both files are loaded in the 
R  Enhanced GPWC with the obstacle database being accessed by the 
R  Enhanced GPWS application only if obstacle alerting is basic to 
R  the aircraft type, or if not basic, if enabled via program pin. 
R  The obstacle data is processed by the display processing function 
R  in the same fashion as terrain is presented on the display as 
R  terrain (coloring scheme), and causes visual indications of 
R  warning and caution alerts like terrain.
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-214,
 (d) Terrain Displays and Alerts
 (Ref. Fig. 019, 020)
 The terrain awareness alerting and display function maintains a
 background display of local terrain forward of the aircraft for
 cockpit display. In the event of terrain caution or warning
 conditions, an aural alert and lamp outputs are triggered. The
 background image is then enhanced to highlight related terrain
 threats forward of the aircraft.
 The background terrain is depicted as variable density dot
 patterns in green, yellow or red. The density and color being a
 function of how close the terrain is relative to aircraft
 altitude. Terrain alerts are depicted by painting the threatening
　
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