Trajectory management framework
Reference: EXE-05.05.01-VP-212 & EXE-04.05-VP-041
About the exercise
The exercise validated iinitial 4 dimensional (i4D) trajectory through the issuing of Controlled Time of Arrival (CTA) to inbound aircraft. CTA is calculated thanks to ground-ground datalink coordination between air traffic control sectors and air-ground datalink coordination between aircraft and ATC.
CTA allows pre-sequencing of inbound traffic, which supports safe, smoother and more cost effective operations.
Validation activities in Rome showed that:
- CTA allocation does not impact safety;
- The concept allows improvements of vertical efficiency: flights were flown at higher, more fuel efficient altitudes and descended following a fuel efficient Continuous Descent Profile.
The concept leads, however, to a deterioration of horizontal performance, which needs to be further investigated.