scope:

ATA Spec 100 contains format and content guidelines for technical manuals written by aviation manufacturers and suppliers and is used by airlines and other segments of the industry in the maintenance of their respective products. This document provides the industry-wide standard for aircraft systems numbering, often referred to as ATA system or chapter numbers. The format and content guidelines define the data prepared as conventional printed documentation. In 2000, ATA Spec 100 and ATA Spec 2100 were incorporated into ATA iSpec 2200: Information Standards for Aviation Maintenance. ATA Spec 100 and Spec 2100 will not be updated beyond the 1999 revision level.