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ACAS Xu

Airborne Collision Avoidance System variant designed for unmanned aircraft.

Definition

ACAS Xu is the FAA / RTCA-developed collision avoidance system tailored for large UAS, replacing TCAS-II logic with optimized lookup tables suitable for non-cooperative targets. It is the standard reference implementation for large CCA-class DAA in U.S. airspace.

Reference attributes

Reference: RTCA DO-365 family
Predecessor: TCAS II

Related terms

Sense-and-Avoid (SAA / DAA)
Capability for uncrewed aircraft to detect and avoid other airspace users.

#safety#airspace