S1000D is an international specification for the procurement and production of technical publications. It is an XML specification for preparing, managing, and using equipment maintenance and operations information. It was initially developed by ASD for use with military aircraft. The specification has since been modified for use with land, sea, and commercial equipment. S1000D is part of the S-Series of ILS specifications.

The UK ASD S1000D National Sub Group meets to discuss issues concerning the development of the S1000D specification from a UK standpoint. It reports to the Combined Technical Documentation Working Group (CTDWG) through its nominated representatives.