SESAR Solutions - Enhanced Airborne Collision Avoidance System (ACAS)

The current report aims at presenting the validation report for such new altitude capture laws. These new altitude capture laws consist in reducing the vertical rate automatically at the approach of the selected flight level. The validation was conducted using the encounter model methodology with operationally realistic assumptions in terms of proportion of aircraft equipped with TCAS II and with these new altitude capture laws, as well as the types of pilot behaviour when RAs are triggered. The validation was made computing key performance indicators on two encounter models (i.e. “safety” and “ATM)” and for several configurations of the new altitude capture laws. These key performance indicators are grouped in four different areas: safety, pilot acceptance, compatibility with ATC and trajectory modification.