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Figure 17−10−31
EGPWC Position and Altitude Determination
The EGPWC determines aircraft position and altitude using GPS sensor data primarily. The
EGPWC monitors RAIM status, and applies geometric altitude algorithms to ensure the required
level of precision is maintained laterally and vertically. If GPS is not available, the EGPWC
applies barometric altitude calculations for vertical position determination, and uses the FMS
integrated navigation solution for lateral position determination.
Terrain/Obstacle Awareness Alerting and Display (TAAD) Database
The TAAD database is comprised of a terrain database and an obstacle database integral to the
EGPWC. The terrain database includes worldwide coverage of the earth’s surface, divided into
grid sets referenced to the WGS-84 datum.
The obstacle database contains known man-made obstacles that are higher than 100 feet AGL.
This database covers all of the USA but only portions of Canada, Mexico, and the Bahamas.
Terrain Awareness Display
The terrain awareness display displays an image of surrounding terrain in varying density dot
patterns of green, yellow, and red. The display is generated from the aircraft altitude compared
to terrain data in the EGPWS computer. These dot patterns represent specific terrain separation
with respect to the aircraft. Terrain more than 2,000 feet below the aircraft is not displayed.
Areas with no terrain data available are shown as a low-density magenta color.
The obstacle data included is depicted on the terrain display in the same fashion as terrain.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−34
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
Terrain/Obstacle Awareness Display Color Patterns
Figure 17−10−32
The crew may independently select the terrain display on either MFD by pushing the TERR
button on the appropriate DCP. The terrain display can be overlaid on any MFD format that
supports weather radar overlay. A cyan TERRAIN annunciation appears on the top left corner of
the MFD to inform the flight crew that the terrain overlay has been selected. Weather radar and
terrain cannot be displayed simultaneously on the same MFD.
Auto Pop-Up
When a terrain awareness caution or a terrain awareness warning are detected, the terrain
overlay automatically pops up on both MFDs, and the format and range automatically change
to FMS MAP and 10 NM.
Display Control Panel − TERR Button
Figure 17−10−33
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−35
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
MFD Terrain Awareness Display
Figure 17−10−34
NOTE
Navigation must not be predicated upon the use of the terrain
awareness display.
If a terrain display fault condition is present when the terrain is being displayed, one of the
following cyan messages will be presented in the bottom left corner of the MFD (i.e., in the
weather radar fault message field): “TERRAIN FAIL”, “TERRAIN CONTROL FAULT”,
“TERRAIN NOT AVAIL”. All terrain messages, except the normal condition “TERRAIN”, flash
for 10 seconds when they are posted.
Terrain/Obstacle Awareness Caution Alert
If the aircraft penetrates the caution envelope boundary, the aural message “CAUTION
TERRAIN” or “CAUTION OBSTACLE” is generated, and the amber GND PROX lights flash.
Simultaneously, terrain/obstacle areas which conflict with the caution criteria are shown in solid
yellow color on the terrain awareness display.
The caution alert is typically given 60 seconds ahead of a terrain/obstacle conflict.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−36
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
Terrain/Obstacle Awareness Caution Alert
Figure 17−10−35
Terrain/Obstacle Awareness Warning Alert
If the aircraft penetrates the warning envelope boundary, the aural message “TERRAIN
TERRAIN, PULL UP” or “OBSTACLE, OBSTACLE, PULL UP” is generated, and the red PULL
UP lights flash. Simultaneously, terrain/obstacle areas which conflict with the warning criteria
are shown red color on the terrain awareness display.
The warning alert is typically given 30 seconds ahead of a terrain/obstacle conflict.
Terrain/Obstacle Awareness Warning Alert
Figure 17−10−36
NAVIGATION SYSTEMS
　
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