S1000D
The international spec for technical publications, data modules and IETMs.
S1000D is an international specification for producing technical publications using a common source database. Instead of writing books, authors write small, self-contained units of information called data modules, which are stored once and reused everywhere they are needed — in maintenance manuals, parts catalogues, training material and interactive viewers.
Jointly maintained by ASD, AIA and ATA, S1000D dominates defence programmes and is increasingly common in civil aviation and other industries. If ATA iSpec 2200 is the world of chapters and page blocks, S1000D is the world of modular, XML-based, database-driven content.
Key areas
Data Modules
The atomic unit of S1000D content: one self-contained chunk of information with its own identity and metadata.
Data Module Code (DMC)
The structured identifier that encodes model, system breakdown, disassembly, information code and more.
CSDB
The Common Source DataBase where all modules, illustrations and publication structures live and are configuration-managed.
Publication Modules & IETPs
How modules are assembled into deliverables — from PDF-style page output to fully interactive electronic tech pubs.
BREX
Business Rules Exchange — the machine-readable rulebook that says how your project applies the specification.
Issue & Applicability
Issue/inwork numbering, applicability annotations and cross-references that keep content precise per configuration.
Thinking in data modules, not documents
A data module packages one procedure, one description, one fault-isolation task or one parts list, along with identification and status metadata (who produced it, its security classification, its applicability, its quality assurance state). Because each module is independent, the same wheel-change procedure can appear in the line maintenance publication and in training material without being written twice.
Every module carries a Data Module Code. Reading a DMC tells you the model identification, the system breakdown (often ATA-aligned for aircraft), the disassembly level, and the information code — a standardised number that says what kind of information it is (description, operation, servicing, removal, installation and so on).
The CSDB and how publications get built
All content lives in the Common Source DataBase. Publication modules then define structure: which data modules, in which order, make up a given manual for a given customer or configuration. From one CSDB you can publish page-oriented output and an Interactive Electronic Technical Publication (IETP) with linked navigation, applicability filtering and multimedia.
Change management is built in. Modules carry issue and inwork numbers, so a publication can be frozen at specific issues while authoring continues — and every delivered state remains reproducible, which matters enormously for airworthiness and contracts.
BREX: the project rulebook
S1000D is deliberately broad, so every project must decide which parts of it to use and how — allowed information codes, mandatory metadata, naming conventions, quality workflows. Those decisions are captured as business rules, and the BREX data module publishes them in machine-readable form so authoring tools and the CSDB can validate content automatically.
In practice, a well-written set of business rules is what separates smooth S1000D programmes from painful ones. It is also where new tech-pubs professionals add value fastest: understanding not just the spec, but how your project has chosen to apply it.
Frequently asked questions
What is S1000D in simple terms?
An international specification for writing technical documentation as small reusable XML units called data modules, storing them in a common source database, and publishing them into manuals or interactive viewers as needed.
What is a Data Module Code (DMC)?
The structured identifier of a data module. It encodes the product model, system breakdown (often ATA-aligned on aircraft), disassembly level, information code and other elements, making every module uniquely addressable.
How is S1000D different from ATA iSpec 2200?
iSpec 2200 structures content as chapter/section/subject manuals with page blocks, traditional in commercial aviation. S1000D is modular and database-driven, built for reuse and interactive delivery, and dominates defence programmes and newer platforms.
What is a BREX data module?
The Business Rules Exchange module — a machine-readable statement of how a project applies S1000D, used by tools to validate that content follows the project's agreed rules.