EGPWS
TAD - Terrain Alert Display
Provides a graphic display of the surrounding terrain on the Weather Radar Indicator.
Digital Values are displayed representing the highest terrain/obstacle elevation and the elevation for the bottom of the lowest color band.
Obstales 100' elevation or higher
Airport Runways 3500' or longer
The terrain topography (within the display range selected) that is above or within 2,000 feet below the aircraft altitude is presented on the system display.
Green
Highest Terrain/Obstacle not within 500 feet of aircraft altitude (250' w/gear down)
50% Green Fill
500' to 1000' below aircraft
Yellow
Terrain/Obstacle Threat Area Caution
60 Secs. from projected impact
"Caution Terrain"
Alert up to 8 nm
50% Yellow Fill
Between 1000' & 2000' feet above aircraft altitude
25% Yellow Fill
500' below to 1000' above aircraft altitude
(250' with gear down)
Red
Terrain/Obstacle Threat Area
Warning
50% Red Fill
More than 2000' above aircraft altitude
30 Secs. from projected impact:
"Terrain Terrain Pull Up"
Alert up to 4 nm
Black
More than 2000' below the aircraft, or within 400' (vertical) of the nearest runway elevation is not displayed.
Magenta
Unknown Terrain
Not in Data-Base
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500' Callout
EGPWS - Another feature available in the Altitude Callouts is a "Smart 500" foot callout. When selected, this callout assists pilots during a non-precision approach by enunciating "FIVE HUNDRED" feet in addition to any other altitude callout if selected in the initial setup. The EGPWS determines a non-precision approach when Glideslope is greater than 2 dots deviation (valid or not) or a back-course approach is detected.
This feature has the distinction of adding the 500-foot callout during non-precision approaches and removing the 500-foot callout on precision approaches when part of the callout option.
Honeywell EGPWS Manual
600-4241-000
Page 20
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"Peaks" is a TAD supplemental feature providing additional display features for enhanced situational awareness, independent of the aircraft's altitude. This includes digital elevations for the highest and lowest displayed terrain, additional elevation (color) bands, and a unique representation of 0 MSL elevation (sea level and its corresponding shoreline). This feature is an option, enabled by program pins during installation.
