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This guidance standard was prepared in response to a need stated by air transport operators for uniformity in further subdividing the ATA Spec. 100 number system to better accommodate avionics systems. The ATA numbers are widely used in the maintenance community for inventory control, instruction manuals and equipment modification Service Bulletins.

This specification defines the addressing plan and rules for addressing used in Aircraft Data Networks (ADN). The plan is organized in accordance with the seven-layer Open Systems Interconnection (OSI) Reference Model. The specification sets forth the structure of addresses that are employed in the ADN and guidance for address determination. This guidance ensures that all applications - that use this address structure to send messages - can know the address structure of the destination(s) at configuration-time.