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This Specification was written to support future aeronautical applications and services beyond those using Transmission Control Protocol/Internet Protocol (TCP/IP). The initial focus is to support air/ground applications using the Aeronautical Telecommunications Network (ATN). These include Controller-Pilot Data Link Communication (CPDLC), Flight Information System (FIS), and Context Management Application (CMA). Supplement 1 was written to allow interoperation with non-IP protocols and services and upper layer services with respect to the OSI reference model. Supplement 1 reflects ICAO Aeronautical Communication Panel recommendations.

The purpose of ARNC 633 is to specify the format and exchange of Aeronautical Operational Control (AOC) communications. Examples of ARINC 633 AOC Structures/Messages include: Flight Plan, Load Planning (i.e., Weight and Balance and Cargo Planning Load Sheets), NOTAMs, Airport and Route Weather data, Minimum Equipment Lists (MEL) messages, etc. The standardization of AOC messages enable the development of applications shared by numerous airlines on different aircraft types. Benefits include improved dispatchability and reduce operator cost.

This standard defines characteristics of a CMU Mark 2 used to route digital data link messages. The CMU Mark 2 is a tri-lingual device capable of ACARS communication, ARINC 622 data link communications and is capable of being expanded to provide Aeronautical Telecommunications Network (ATN) services.