(f)
Obstacle Data Base Provisions are also made for future use of an obstacle data base providing obstacle data in the vicinity of major airports. This data base will provide altitude for man-made obstacles or groups of obstacles that protrude above the Enhanced GPWS terrain protection floors.
R 1EFF : 106-149, 215-299, 301-399, 1 34-48-00Page A29 1 1 Config-1 Aug 01/05 1 1 1CES 1
R **ON A/C 401-499,
R (d) Terrain / obstacle displays and Alerts
R (Ref. Fig. 022, 023)
R The terrain awareness alerting and display function maintains a
R background display of local terrain forward of the aircraft for
R cockpit display. In the event of terrain or obstacle caution or
R warning conditions, an aural alert and lamp outputs are
R triggered. The background image is then enhanced to highlight
R terrain or obstacle threats forward of the aircraft. Obstacle
R threats forward of the aircraft are also enhanced if the adjacent
R terrain altitude is within a lowerterrain layer, or if the
R adjacent cells are not illuminated. Obstacle enhancement is only
R applicable to the 15, 30 and 60 arc second tiers.
R The background terrain is depicted as variable density dot
R patterns in green, yellow or red. The density and color vary
R according to how close the terrain or obstacle in relation to
R aircraft altitude. Additionally, the display of terrain based on
R absolute terrain elevation is provided if the optional Peaks mode
R is enabled. Terrain and obstacle alerts are depicted by
R displaying the threatening terrain as solid yellow and/or red.
R The terrain display algorithms process the set of digital
R elevation matrix overlays into a matching set of display matrix
R overlays and passed to the radar display output processor. The
R display matrix overlays hold display attributes rather than
R altitude for each matrix element. These attributes are computed
R for the background and terrain threat areas and kept small to
R reduce memory requirements and transfer time to the radar display
R output processor. The aircraft position and aircraft heading are
R used at the radar display output processor to extract the
R radar-like sweeping image ahead of the aircraft from the display
R overlays.
R Each element of the output display matrix overlays holds a single
R display attribute byte with fields for the colors, patterns, and
R symbols shown in the following table:
R 1EFF : 401-499, 1 34-48-00Page A30 1 1 Config-1 Aug 01/05 1 1 1CES 1R Enhanced GPWS - Peaks Terrain background display legend R Figure 022
R 1EFF : 401-499, 1 34-48-00Page A31 1 1 Config-1 Aug 01/05 1 1 1CES 1R Enhanced GPWS - Terrain background display on ND R Figure 023
R 1EFF : 401-499, 1 34-48-00Page A32 1 1 Config-1 Aug 01/05 1 1 1CES 1
R -------------------------------------------------------------------------------
R | Color | Threat |
R -------------------------------------------------------------------------------
R | Solid Red | Warning terrain (approximately 30 seconds from |
R | | impact) |
R |---------------------|-------------------------------------------------------|
R | Solid Yellow | Caution terrain (approximately 60 seconds from |
R | | impact) |
R |---------------------|-------------------------------------------------------|
R | High Density Red | Terrain that is more than 2000 ft. above aircraft |
R | | altitude |
R |---------------------|-------------------------------------------------------|
R | High Density | Terrain that is between 1000 ft. and 2000 ft. above |
R | Yellow | aircraft altitude |
R |---------------------|-------------------------------------------------------|
R | Medium Density | Terrain that is 500 ft. (250 ft. with gear down) |
R | Yellow | below to 1000 ft. above aircraft altitude |
R |---------------------|-------------------------------------------------------|
R | Solid Green | (Peaks only) Highest terrain not within 500 ft. |
R | | (250 ft. with gear down) of aircraft altitude. |
R | | Mainly appears with dotted yellow terrain when the |
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