ED-242D supersedes ED-242C (2021). This document contains Minimum Aviation System Performance Standards (MASPS) for Aeronautical Mobile Satellite (Route) Services (AMS(R)S) that provide safety communications to aircraft in airspace where 1) procedural separation is applied or 2) ATS surveillance services are provided.

The main changes from the previous revision are that the actual Inmarsat SBB & Iridium Certus MASPS material is updated with respect to SATCOM system improvements, and ATN-IPS technical material has been added.