Abstract: Applicability is an effective information filtering method, correctly using the applicability mechanism provided in S1000D, automatic processing of applicability can be achieved and the correct information can be delivered to the end user. Based on the study of S1000D applicability, the method of creating ACT, PCT and CCT is analyzed.Taking the civil aircraft as an example, the applicability data modules are written, and the rules and logic of applicability declarations and applicability test are analyzed. Studying result of applicability implementation mechanism can supply guiding reference for correct using of applicability in authoring technical documents.

Key words: S1000D, applicability, data module, information filtering