ARINC Characteristic 771-3:2024

This document sets forth the desired characteristics of the Iridium Low-Earth Orbiting (LEO) Aviation Satellite Communication (Satcom) System avionics intended for installation in all types of aircraft including commercial transport, business, and general aviation aircraft. This document provides a description of the system components, aircraft interfaces, and satellite communication functions. It also describes the desired system performance and operational capability of the equipment. The equipment defined in these standards are capable of supporting Air Traffic Safety Serices. This characteristic specifies equipment using the next generation of Iridium satellites (referred to as Iridium NEXT) operating in L band. The services used on the NEXT network are referred to as Iridium Certus®. Based on maximum baud rates and antenna configuration different Certus Service Classes are offered. The Iridium NEXT/Certus satellite network replaces the Iridium legacy satellite network known as Block 1.