TS EN 9300-115

TS EN 9300-115 addresses the long-term archiving and retrieval of an explicit mechanical CAD assembly structure. Its focus is the preservation of how an assembly is built up and how each component is positioned within that structure, so the digital product definition can be reconstructed later. Within the LOTAR family, this part supports continuity of technical product data in aerospace and related engineering environments.

How the assembly tree is organised

In CAD practice, an assembly structure is a hierarchical relationship that groups individual parts into assemblies and assemblies into higher-level assemblies. Leaf nodes represent individual parts, while non-leaf nodes represent assemblies. Because the same part or subassembly may appear multiple times in a design, the structure must preserve not only membership in the product tree but also the relative placement of each occurrence. That distinction is central to making archived data usable again.

What this part covers and what it leaves out

• It covers archiving of the assembly tree structure together with associated placement information.
• The geometry of the individual component parts is outside the scope of this part.
• The assembly structure may be stored in the same file as the geometry or reference geometry externally.
• It may be delivered as a single file or as multiple files with cross-references.
• The goal is reliable retrieval of the assembly structure and its positioning data over time.

As general technical context, standards of this kind preserve engineering data not only as shapes but also as relationships. In aerospace and other high-value manufacturing domains, it can matter which part belongs to which subassembly, how instances are oriented, and how the product tree is organised. Archiving the explicit assembly structure helps maintain data integrity for reuse, traceability and long-term access.

This listing represents a specific part within the LOTAR series. It is focused on the explicit assembly structure rather than the full CAD model, and its practical value lies in safeguarding the product tree and its placement relationships for future retrieval.