In the VDLM2 environment where the protocol and infrastructure are a challenge in terms of interoperability, it is important to provide recommendations about how the ground systems are expected to behave and what is the expected avionics answer.

This document aims at defining a coordinated understanding of the ground behaviors in addition to the MOPS which are more related to avionics systems. In particular some out of sync cases have been identified in operations, showing a need for interoperability improvement.