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S-AF2.5 — Airport Safety Nets

Airport safety nets consist of the detection and alerting of conflicting ATC clearances to aircraft and deviation of vehicles and aircraft from their instructions, procedures or routing which may potentially put the vehicles and aircraft at risk of a collision. The scope of this sub-functionality includes the Runway and Airfield Surface Movement area. ATC support tools at the aerodrome shall provide the detection of Conflicting ATC Clearances and shall be performed by the ATC system based on the knowledge of data including the clearances given to aircraft and vehicles by the air traffic controller, the assigned runway and holding point. The air traffic controller shall input all clearances given to aircraft or vehicles into the ATC system using a digital system, such as the EFS. Different types of conflicting clearances shall be identified (for example Line-Up vs. Take-Off). Some may only be based on the air traffic controller input; others may in addition use other data such as A-SMGCS surveillance data. Airport Safety Nets tools shall alert air traffic controllers when aircraft and vehicles deviate from ATC instructions, procedures or route. The air traffic controller instructions available electronically (through a digital system, such as EFS) shall be integrated with other data such as flight plan, surveillance, routing, published rules and procedures. The integration of this data shall allow the system to monitor the information and when inconsistencies are detected, an alert shall be provided to the air traffic controller (for example no push-back approval).

Deployment Target Date


System Requirements

- Airport Safety Nets shall integrate A-SMGCS surveillance data and controller runway related clearances; Airport Conformance Monitoring shall integrate A-SMGCS Surface Movement Routing, surveillance data and controller routing clearances
- A-SMGCS shall include the advanced routing and planning function referred to in S-AF 2.4 above to enable conformance monitoring alerts
- A-SMGCS shall include a function to generate and distribute the appropriate alerts. These alerts shall be implemented as an additional layer on top of the existing A-SMGCS Level 2 alerts and not as a replacement for them
- The controller working position shall host warnings and alerts with an appropriate human-machine interface including support for cancelling an alert
- Digital systems, such as EFSs, shall integrate the instructions given by the air traffic controller with other data such as flight plan, surveillance, routing, published rules and procedures

Geographical Scope

Airport Safety Nets shall be operated at the following airports: London-Heathrow, Paris-CDG, London-Gatwick, Paris-Orly, London-Stansted, Milan-Malpensa, Frankfurt International, Madrid-Barajas, Amsterdam Schiphol, Munich Franz Josef Strauss, Rome-Fiumicino, Barcelona El Prat, Zurich Kloten (1), Düsseldorf International, Brussels National, Oslo Gardermoen (2), Stockholm-Arlanda, Berlin Brandenburg Airport, Manchester Ringway, Palma De Mallorca Son San Juan, Copenhagen Kastrup, Vienna Schwechat, Dublin, Nice Cote d'Azur.
This sub-functionality should also be operated at the Istanbul Ataturk Airport.
(1) Subject to incorporation of this Regulation into Agreement between the European Community and the Swiss Confederation on Air Transport.
(2) Subject to incorporation of this Regulation into EEA Agreement.

Operational Improvement Steps

Code Title IOC FOC Related Elements
AO-0104-A Airport Safety Nets for Controllers at A-SMGCS Airports 31-12-2019 31-12-2023