Transcript T2CAS for ICAO Presentation rev1 final - coscap-na

Terrain and Traffic Collision Avoidance System
T2CAS - The second generation TAWS
Thales group : A worldwide leader
Aerospace
Air
Systems
Land & Joint
Systems
Naval
Security
Services
2005 Sales: €10.3bn - Order book: €20.2bn
60,000 employees in 50 countries
A worldwide leader in both civil and defence markets
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THALES MARS SIMULATION
ATC position
consists of an
EUROCAT station
Ground
Avionics function
FM, Taxi, TAWS, TCAS..
Aircraft Model
Environment
dB server
Traffic gene.
Atmo. Gene.
Unique Market Position to integrate Air and Ground solutions
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THALES Aerospace: brief history
2004
THALES Airborne Systems
Thales Aerospace Division
2001 L-3 Communications (JV)
2000
Racal
2000 VDO+BGT (JV)
1999
Auxilec
B/E Aerospace
ACSS
Thales Avionics Ltd
Diehl Avionik Systeme GmbH
Thales Avionics- Inflight Systems
Thales Avionics Electrical Systems
THOMSON-CSF SEXTANT
SEXTANT AVIONIQUE
THOMSON-CSF/AVG
EAS SFENA
JAEGER
CROUZET
MORS
BADIN
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1989
1999
What is T²CAS?
Certified TAWS: GCAM = second generation TAWS
Reduced LRU count
Second generation TAWS :
Performance based
Sensors
 Enhanced Landing
Protection
Lower cost of ownership
TCAS 2000 = Proven Second Generation TCAS system with over
9000 units flying
Enhanced TAWS and Proven TCAS combined
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Performance Based Clearance Sensors
At all time …
 The short-term segment of the clearance sensor models what the
aircraft is currently doing: True current flight path angle
 The long-term segment of the clearance sensor models what the aircraft
could do if an alert were to occur: Actual climb performance
 As compared to conventional clearance sensors, this allows a longer
clearance sensor to be built without generating nuisance alerts.
GPS
8 Sec.
20 Sec.
React
Respond
Climb Capability
Digital Terrain Database
Performance Based Alerts , enhancing safety
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T2CAS Runway Convergence Envelope Overview
The T2CAS provides CFIT (Controlled Flight Into Terrain) protection for all phases of flight,
including the approach and landing phase.
The Convergence Envelope (or “Landing Tunnel”) logic is designed to predict whether the
aircraft is properly converging on the runway for a safe landing. If proper convergence is
predicted, the forward-looking Collision Predicting and Alerting (CPA) function is inhibited
(the reactive GPWS modes remain active throughout the landing procedure).
Cross-section:
Non - Inhibition
Inhibition
Region
8º
2.64º
Runway
Non - Inhibition
0.3 Nm
Figure 1
TAWS Convergence Envelope: Inhibition When Landing Normally, Alerting Enabled When
Outside of Normal Landing Area
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T2CAS Runway Convergence Envelope Overview
The Convergence Envelope is NOT simply a volume of space within which
CPA alerting is inhibited. The previous figure above (reproduced from the
ACSS T2CAS Pilot’s Guide, Doc 8000264-001 Rev 1) loosely illustrates the
physical geometry of the Convergence Envelope in terms of:
 Distance from Runway
 Vertical Position
 Horizontal Position
However, landing tunnel does also include these additional conditions:
 Track Angle
 Vertical Speed
 Flap and Gear Setting – one of the two must be down to
inhibit
Runway position accuracy is essential
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T2CAS Runway Convergence Envelope Overview
In summary, the T2CAS TAWS function inhibits CPA alerting during
runway approaches as long as the following conditions are met:




Aircraft is in Approach Phase
Aircraft is in proper Landing Configuration
Runway Convergence is predicted
The CPA function can be re-enabled at any time if
these conditions fail to remain satisfied. At this point
the system will generate the appropriate alerts,
should a CFIT potential exist.
Alert Possible!
Inhibition
Region
2.64º
Runway
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0.3 Nm
Non - Inhibition
T2CAS Runway Convergence Envelope Overview
If Runway Source Data is in error, nuisance alerts can result.
Example of Runway Threshold Location Problem at ONE AIRPORT Which
Causes a Misaligned Tunnel and Nuisance Alert
Initial source data shows
westward lateral shift of
0.5 Nm
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T2CAS Runway Convergence Envelope Overview
DB 20 Misaligned Tunnel Causes a Nuisance Alert to be Indicated
Inhibition on Horizontal Position
28.91
XX.91
Horizontal Landing Tunnel
Runway
XX.89
28.89
Flightpath
Latitude
XX.87
28.87
DB20 Runway
Threshold is defined
to the left of the
actual runway. The
Aircraft Exits the
Horizontal Landing
Tunnel and an alert is
indicated via CPA
sensor contacting the
“terrain” of the
runway.
XX.85
28.85
XX.83
28.83
XX.81
28.81
XX.79
28.79
115.79
XX5.79
XX5.84
115.84
XX5.89
115.89
Longitude
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XX5.94
115.94
XX5.99
115.99
T2CAS Runway Convergence Envelope Overview
DB 21 Corrects the Runway Location which Aligns the Tunnel. No
Nuisance Alert Is Indicated.
Inhibition on Horizontal Position
XX.91
28.91
Horizontal Landing Tunnel
XX.89
28.89
Runway
Flightpath
Latitude
XX.87
28.87
DB21 Corrects the
runway Threshold
location. The Aircraft
does not Exit the
Horizontal Landing
Tunnel and an alert is
NOT indicated.
XX.85
28.85
XX.83
28.83
XX.81
28.81
XX.79
28.79
XX5.79
115.80
XX5.84
115.85
XX5.89
115.90
XX5.94
115.95
XX5.99
116.00
Longitude
Runway position accuracy is essential
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A broader Alert sequence to avoid accidents
Current Climb Capability of Aircraft
GPS
Full Descent / Climb Path Protection
Terrain Adv. Line Advisory added to Display
‘AVOID’ when PULL-UP is NOT Enough
Expanded Look when Entering Turns
4-D Approach Projection for Landing
New
New
Terrain Advisory Line – Advisory Caution - Aural Alert
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Pull-Up - Aural Warning
Avoid - Aural Warning
T2CAS Airport and Terrain
Database
Database Development Process
Database Development Process
Terrain Data
Providers
AIS
THAV
EAG
Civil
Aviation
Authorities
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ACSS
End-user
Terrain Data
•Source data comes from
Official Terrain Data Providers
Terrain Data
Providers
AIS
 US Geological Survey
 National Imaging and
Mapping Agency
 Shuttle Radar Topographical
Mission (SRTM) Data
 Etc.
•Advanced InfoData Systems,
GmbH (AIS) compiles the
data
 Per DO-200a process
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Airport and Runway Data
•Source data comes from
Official State Agencies
 FAA/NACO
 JAA
 Etc.
EAG
Civil
Aviation
Authorities
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•European Aeronautical
Group (EAG) Generates an
ARINC 424 database
 Per DO-200a process
Combined Data
•Thales Avionics performs
verification and validation of
the data, filters the airport
data, and merges Terrain and
Airport Data into a single file
THAV
ACSS
Enduser
 Per DO-200a process
 Calculates 32bit CRC for
integrity checking
•ACSS attaches a file header
and distributes the data to
customers
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