• SJU reference # PJ.02-03 /Release 2019
  • Stakeholders
  • Benefits Capacity
  • Status In the pipeline

The arrival and departure phases of flight are among the most safety-critical, but also where close spacing between aircraft can significantly increase capacity. The minimum separation distance between aircraft on final approach to the runway is currently typically 3 nm, or can be 2.5 nm under certain conditions depending upon international and local regulations.

This candidate solution is dependent upon the availability of accurate aircraft position data used by air traffic control and radar surveillance information that can satisfy the required surveillance and safety performance of 2 nm separation. The solution will demonstrate that the mid-air collision risk is acceptable, the new minima is compatible with the leader runway occupancy time (ROT) and pair-wise wake separations.

In reality, it is unlikely that there will be many pairs separated by 2 nm because of larger ROT and wake constraints.  Mindful of this, the candidate solution proposes to deliver the separation minima either through a category-based approach, where the new surveillance minima will only be allowed behind a leader aircraft category with a shorter ROT, or, through a separation tool (such as time based separation), which will propose the minimum separation being the higher value of ROT, wake or the new surveillance minima.


  • Increased airport capacity
  • Enhanced safety and increased resilience
  • Improved fuel efficiency
  • Increased operational and cost efficiency