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RA Downlink Home |
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Resolution Advisories (RAs) are issued by the Airborne Collision Avoidance System (ACAS) (also referred to as TCAS – Traffic alert and Collision Avoidance System) if a risk of collision is identified. The RA takes precedence over ATC instructions and the controller should not interfere with the resulting collision avoidance manoeuvre.
Until recently controllers have only known about RAs when, and if, the pilot reports them. Therefore, the controllers' situational awareness may be diminished if the aircraft departs from its clearance as the result of an RA.
However, when an RA is generated the aircraft’s transponder can provide detailed information about the RA for downlink. If proved feasible and safe RA downlink will provide faster, more structured, automatic notification of RAs, which will remain on the controller screen until Clear of Conflict.
Currently, RA downlink research is undertaken in the SESAR projects 4.8.3 and 15.4.3. |
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RA Downlink in PASS |
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RA Downlink is part of the EUROCONTROL PASS project.
For more information on RA Downlink in the PASS project.
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RA Downlink in FARADS |
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RA Downlink carried out the Feasibility of ACAS RA Downlink Study (FARADS) the objective of which was to assess the technical and operational feasibly, as well as safety aspects, of displaying ACAS RA information on Controller's Working Positions (CWP). |
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RA Downlink Workshop Berlin, October 2009 |
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For more detailed information about the workshop |
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