TS EN 9300-125

TS EN 9300-125 belongs to the LOTAR family for long-term preservation of aerospace digital technical product documentation based on 3D CAD and PDM data. It addresses the persistent storage and later retrieval of graphical Product and Manufacturing Information (PMI) associated with an explicit CAD assembly structure.

The role of PMI in an explicit assembly structure

In general technical terms, PMI is the production-oriented information attached to a 3D product definition, such as dimensions, tolerances and manufacturing notes. The key point in this standard is that the assembly-level PMI is preserved as graphic-only content, not as semantic PMI. That means the information is represented visually, for example as polylines or tessellated graphics, so that its appearance and placement can be recovered in relation to the original CAD geometry. The preservation goal is continuity of the assembly presentation and placement information over time.

What is in scope, and what is not

• The standard covers long-term archiving of explicit CAD assembly structure together with assembly-level graphical PMI.
• PMI may be stored in the same file as the geometry, within a nested assembly structure, or in a separate side-car file.
• Retrieval should allow the assembly structure and placement information to be recovered.
• Archiving of assembly form features is out of scope.
• Semantic PMI representation is out of scope.
• Assembly-level geometry is out of scope; the document addresses assembly-level PMI only.

EN 9300-125 extends EN 9300-115, which deals with explicit CAD assembly structure, by adding assembly-level PMI. For organisations handling long-lived aerospace product data, this distinction matters because preserving only the shape data is not enough when the assembly’s graphical manufacturing annotations must also remain usable over time.