• SJU reference # PJ.01-05 /Release 2019
  • Stakeholders
  • Benefits Cost-efficiency
    Operational efficiency
  • Status Discontinued

Advanced navigation capability on board modern aircraft supports precise flight paths, which enhance safety and capacity. New technology can also help pilots to manage their spacing with other traffic while adhering to PBN procedures in the terminal manoeuvring area. The main challenge is to increase capacity and runway throughput while keeping the arriving and departing traffic streams on the fixed routes. Today this is typically done through vectoring and merging traffic into a single stream as late as possible, for example at the beginning of final approach.

This candidate solution investigates the use of techniques available to the pilot, such as airborne spacing – flight deck interval management (ASPA-IM), to provide detailed traffic information in the cockpit. The technology addresses speed and energy control on previously assigned PBN routes. The routes can be dynamically adjusted and updated if necessary using what-if capabilities. If traffic flows merge relatively early, the controller may use monitoring tools, altitude separation, and spacing at the merge point. The advantage of ASPA-IM is that is provides more precise inter-aircraft spacing through closed-loop, precise guidance within the flight deck and it reduces controller task load by relieving the need to communicate multiple speed instructions. It is, however, costly to install and requires a cost-benefit assessment by the airspace user. Both ground-based and airborne tools need to be coordinated and for information exchange to take place through ADS-B.


  • Enhanced safety

  • Reduced fuel consumption and emissions

  • Optimised airport and TMA capacity

  • Enhanced predictability

  • Increased operational and cost-efficiency