MIL-HDBK-505 Base Document:1998

1 Scope
    1.1 Purpose
    1.2 Application
2 Referenced documents
3 Definitions
    3.1 Item levels
          3.1.1 Part
          3.1.2 Subassembly
          3.1.3 Assembly
          3.1.4 Unit
          3.1.5 Group
          3.1.6 Set
          3.1.7 Subsystem
          3.1.8 System
                  3.1.8.1 General
                  3.1.8.2 Electrical-electronic
    3.2 Exchangeability of items
          3.2.1 Interchangeable item
          3.2.2 Replacement item
          3.2.3 Substitute item
    3.3 Models (development and production)
          3.3.1 Exploratory development
          3.3.2 Advanced development
          3.3.3 Engineering development (service test)
          3.3.4 Preproduction (prototype)
          3.3.5 Production
    3.4 Other related terms
          3.4.1 Accessory
          3.4.2 Attachment
          3.4.3 Item
4 General statements (not applicable)
5 Detail statements (not applicable)
6 Notes
    6.1 Supersession data

Establishes the standard terms and definitions used in describing the levels of military items and to designate and define item exchangeability, models and other related terms.