1. Figure 9;LFPG.
2. CONCLUSION To assess benefits and limits of airborne spacing for arrival flows of aircraft,controller-in-the-loop and pilotin-the-loop experiments have been conducted. Beyond assessing interface usability and overall feasibility, the latest pilot-in-the-loop experiment aimed at analysing the impact of various tolerance margins on flight crew activity. Flight crews were tasked to perform a spacing task in a manual ("selected") mode, from cruise to initial approach. Flight crew feedback were generally positive. Despite a new task in the cockpit which requires appropriate assistance to contain workload, pilots highlighted the positive aspects of getting in the loop, understanding their situation (through goaloriented instructions), and gaining anticipation. If tolerances of 1 and 0.5Nm seem feasible to maintain under nominal conditions, the 0.25Nm tolerance seems more difficult and requires more effort and attention. The next step will consist in getting closer to the runway, typically at the final approach. Scenarios will be based on the findings from the controller approach experimentconducted inNovember 2002.
3. FAA/Eurocontrol, 2001, "Principles of Operation for the Use of Airborne Separation Assurance Systems",FAA/EurocontrolCooperative R&D.