EACAC 2001 Real-time Experiment - The Annex

The report presents the analysis of the EACAC December’, 2001 experiment. The objective of this 3-week experiment was to extend the scope of previous experiments towards more insight on the impact of delegation on controller activity (workload, monitoring, situation awareness) in E-TMA and make an initial assessment of its use in approach (transfer and co-ordination, flows integration). Six controllers from different European countries participated. The airspace simulated was part of Paris area, and consisted of four measured sectors (two E-TMA and two simplified approach sectors). The feeling from controllers is positive: the delegation is perceived as satisfying, and should enable a workload reduction. The acceptance is also revealed by the significant rate of use.Subjective analysis of workload (ISA and NASA-TLX) tends to show that delegation reduces controller workload. Previous results were confirmed: delegation allows for a significant reduction in the number of manoeuvring instructions and for an earlier building of the sequences. The sector configuration has an impact on the use of delegation. Monitoring task was analysed through the use of eye movement tracking techniques. Results tend to show that, in very high traffic situations, delegation enables the focus to be maintained on the early part of the sector, that is on the sequence building area. Delegation does not modify the frequency of monitoring per aircraft. The situation awareness assessment method needs to be improved. In terms of safety, delegation does not induce more losses of separation but more stable and regular transfers. Delegation errors are mainly related to the set up of initial applicability conditions.During the implementation phase, air traffic control systems and procedures will have to cater for, and assimilate mixed MODE S and classical transponder equipped flights, and maintain the interoperability between MODE S equipped and non MODE S equipped ground stations.

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EACAC 2001 Real-time Experiment - The Annex