Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 93
aircraft. The red and yellow dot patterns are unchanged and continue to indicate terrain that is near or above the current
altitude of the aircraft. Solid yellow and red colors are also unchanged and continue to indicate caution and warning areas
relative to the flight path of the aircraft. Terrain identified as water (0 feet MSL) may optionally be displayed as cyan dots if
the aircraft display hardware supports the color cyan. The Peaks display is prioritized such that higher level colors and
densities override lower color and densities for maximum situational awareness of the most significant terrain relative to the
altitude and flight path of the aircraft.
With the Peaks display, two elevation numbers indicating the highest and lowest terrain currently being displayed are shown
on the display. The elevation numbers indicate terrain in hundreds of feet above sea level (MSL). The terrain elevation
numbers are displayed with the highest terrain number on top, and the lowest terrain number beneath it. The highest terrain
number is shown in the same color as the highest terrain color pattern on the display, and the lowest terrain number is shown
in the color of the lowest terrain color pattern shown on the display. A single elevation number is displayed when the screen
is all black or blue as a result of flying over water or relatively flat terrain where there is no appreciable difference in terrain
elevations. The elevation numbers on the display are an additional indication that the terrain display is selected.
The Peaks display option is enabled via program pin during aircraft installation of EGPWS. Customers may choose the
standard terrain display or the Peaks display. Configurable display options, including the water display option, are defined
within the EGPWS computer.
High Density Green
Low Density Yellow
High Density Yellow
High Density Red
Ref Altitude -1000
Ref Altitude -250/500
Ref Altitude + 1000
Ref Altitude + 2000
Ref Altitude -2000
Low Density
Green
Reference Altitude
Black
Reference altitude is projected down from actual aircraft altitude to provide a 30 second advance
display of terrain when descending more than 1000 FPM.
Terrain is not shown if it is more than 2000 feet below the reference altitude and/or is within 400
feet of the runway elevation nearest the aircraft.
Reference
Altitude
TABLE 6.7-4: STANDARD TERRAIN BACKGROUND DISPLAY