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issued. The aural and visual alerts operate until the airplane exits the alert envelope.
Terrain Clearance Floor Database
The TCF database is integral to the TAWS computer, and includes worldwide coverage of all
airports with hard-surfaced runways longer than 3,500 feet in length.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−24
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (CONT'D)
Terrain Clearance Floor (TCF)
Figure 17−10−25
Terrain/Obstacle Awareness Alerting and Display (TAAD)
A feature of the TAWS is the incorporation of the terrain/obstacle awareness alerting and
display function. This function uses aircraft geographic position, aircraft altitude, and a terrain
and obstacle database, to predict potential conflicts between the aircraft flight path and the
terrain or obstacle, and to provide terrain display overlay of the conflicting terrain or obstacles.
The terrain awareness alerting algorithms continuously compute terrain clearance envelopes
ahead of the aircraft, as a function of ground speed, flight path angle and track. If the
boundaries of these envelopes conflict with terrain elevation data in the terrain database, alerts
are issued. Two envelopes are computed, one corresponding to a terrain caution alert level and
the other to a terrain warning alert level.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−25
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (CONT'D)
TAAD Caution and Warning Alert Envelopes
Figure 17−10−26
TAWS Position and Altitude Determination
The TAWS computer determines aircraft position and altitude using GPS sensor data primarily.
The computer 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
computer 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
TAWS computer. 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 the USA, Canada, the Caribbean, Europe, Australia, and portions of the
Middle East and Far East. A complete obstacle database map is available at www.egpws.com
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 TAWS 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 17−10−26
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (CONT'D)
Terrain/Obstacle Awareness Display Color Patterns
Figure 17−10−27
The crew may independently select the terrain display on either PFD or MFD by selecting the
function on the appropriate menus. The terrain display can be overlaid on any PFD/MFD format
that supports weather radar overlay. A cyan TERRAIN annunciation appears on the bottom right
corner of the displays to inform the flight crew that the terrain overlay has been selected.
Weather radar and terrain cannot be displayed simultaneously on the same display.
Auto Pop-Up
When a terrain awareness caution or a terrain awareness warning are detected, the terrain
overlay automatically pops up on both PFDs, and the format and range automatically change
to PPOS MAP and 10 NM.
Display Control Panel− Terrain Button
Figure 17−10−28
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−27
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (CONT'D)
PFD/MFD Terrain Awareness Display
Figure 17−10−29
NOTE
Navigation must not be predicated upon the use of the terrain
　
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