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> Index of every page on this site: [llms.txt](https://www.tungsten.aero/llms.txt)

# Built for Part 21J design offices

Tungsten encodes common Part 21J patterns: project staging, document approvals, certification plan snapshots, and library-backed stakeholders. Regulatory acceptance always remains with your organisation and the competent authority — the product reduces administrative drag, it does not certify on your behalf.

[See feature areas](https://www.tungsten.aero/features) for an honest view of what ships today versus what is still maturing on the roadmap.

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## Sitemap

See the full [sitemap](https://www.tungsten.aero/sitemap.md) for all pages.