scope:

This standard provides:

a. interoperability requirements for the B2 ATN ground system to provide FANS 1/A aircraft with B2 data link services, as defined by the B2 SPR Standard [4]. See 1.2.1.

b. interoperability requirements to ensure seamless transition of ATS communications for bilingual aircraft (i.e., aircraft equipped with FANS 1/A and ATN data link technologies transitions from a FANS 1/A ground system to a B2 ATN ground system and vice versa). See 1.2.2.

NOTE:

1. This standard provides a distinct set of requirements for each of these two capabilities, which can be implemented and qualified independently.

2. Some B2 ATN ATSUs may elect only to provide data link services to FANS 1/A aircraft (paragraph CHAPTER 3), only to provide seamless transfer to FANS airspace (paragraph CHAPTER 4) or to provide both (paragraph CHAPTER 3 and paragraph CHAPTER 4). Some FANS 1/A ATSUs may elect to provide seamless transfer to ATN airspace (paragraph CHAPTER 4).

3. FANS 1/A and ATN bilingual aircraft may elect to support seamless transfer to ATN and FANS 1/A airspace (paragraph CHAPTER 4).