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algorithms are improved at higher airspeeds (about 300 knots
or greater). The look-ahead distance is designed to provide a
60-second warning alert for up to 8 nm look-ahead (as
opposed to 30-seconds or up to 4 nm). With version -218-
218 and later, the look-ahead distance is increased by
12.5%, and the allowed terrain clearance height is
increased for descents at high speeds to improve alerting
times.
The specific aural message provided is established during the
initial installation of the EGPWS as a function of whether or not
the terrain and obstacles features are enabled and the selected
audio menu (via program pin selection).
Refer to an applicable AFM or EGPWS AFMS for specific
application information or contact Honeywell for additional
information.
When a compatible Weather Radar, EFIS, or other display is
available and enabled, the EGPWS Terrain Alerting and Display
(TAD) feature provides an image of the surrounding terrain
represented in various colors and intensities.
There are two types of TAD displays depending on the options
selected. The original type provides a terrain image only when
the aircraft is 2000 feet or less above the terrain. A second type
called “Peaks” enhances the display characteristics to provide a
higher degree of terrain awareness independent of the
aircraft’s altitude (available for selected display types in
version -206-206 with additional displays added in later
versions). In either case, terrain and obstacles (if enabled)
forward of the aircraft are displayed. Obstacles are presented
on the cockpit display as terrain, employing the same
display-coloring scheme. TAD, Peaks and Obstacle functions
are enabled by EGPWS program pin selection.
NOTE: With respect to Non-Peaks or Peaks display, terrain
and or obstacle presentation is always based on (and scaled
for) the geographic area available for display. Consequently,
terrain and/or obstacles outside of the selected display range
and defined display sweep do not have any effect on the
displayed image.
Terrain
Alerting
and Display
Terrain
Look
Ahead
Alerting
continued
060-4241-000 • Rev. E - December 2003
30 MK V & MK VII EGPWS Pilot Guide
Each specific color and intensity represents terrain (and
obstacles) below, at, or above the aircraft’s altitude based on the
aircraft’s position with respect to the terrain in the database. If
no terrain data is available in the terrain database, then this area
is displayed in a low-density magenta color. Terrain more than
2000 feet below the aircraft, or within 400 (vertical) feet of the
nearest runway elevation, is not displayed (black). With version
-218-218 or later, the transition to black may occur below
400 feet based on runway and terrain database integrity for a
given area.
Non-Peaks
Display
The Non-Peaks display provides a graphical plan-view image
of the surrounding terrain as varying density patterns of green,
yellow, and red as illustrated in the following graphics. The
selected display range is also indicated on the display, and an
indication that TAD is active is either indicated on the display
(i.e., “TERR”) or by an adjacent indicator.
+2000'
+1000'
-1000'
-2000'
0
(Variable)
Aircraft Elevation
-500’
High Density Red
High Density Yellow
Low Density Yellow
High Density Green
Low Density Green
Black
TERRAIN IS SHOWN
IN SHADES OF GREEN,
YELLOW AND RED
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 31
When a warning alert is triggered, the terrain (or obstacle)
that created the alert is changed to solid red (100% density) as
illustrated below.
NOTE: When a TAD caution or warning alert is active, the
display image (cells) surrounding the target are enlarged
(surrounding cells are illuminated). This allows a smaller
terrain or obstacle (e.g., a single tower) to be better seen on
the display.
The transition between green and yellow is below the aircraft in
order to account for altimetry and/or terrain/obstacle height
errors. Also, the transition altitudes between colors are biased
upward proportional to the descent rate when greater than
1000 feet per minute. This provides approximately a 30
second advance display of terrain.
Non-Peaks
Display
continued
When a caution alert is triggered, the terrain (or obstacle) that
created the alert is changed to solid yellow (100% density) as
illustrated below.
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