This document provides interoperability requirements to enable FANS 1/A aircraft and ATN aircraft to co-exist in the same operational environment. The standard was developed to enable air traffic service providers (ATSPs) to interoperate with datalink equipped aircraft, regardless of which technology is installed on the aircraft. The standard is intended for the convergence of oceanic and continental datalink applications. It provides the interoperability requirements for an aeronautical telecommunication network baseline 1 (ATN B1) ground system that provides air traffic data link services to future air navigation system 1/A (FANS 1/A) aircraft in continental airspace.

This revision includes the new requirements for Seamless ATS communications transition between different datalink technologies