TSA Security Directive Pipeline‑2021‑02D, effective July 27, 2023, replaces the previous directive while maintaining consistency so compliance efforts under 02C remain valid. It applies to owners and operators of TSA‑designated critical pipeline systems notified before July 26, 2022, with new operators notified separately and given deadlines. The directive requires identifying critical cyber systems, updating protections, and strengthening cybersecurity measures. It introduces incremental enhancements rather than major changes, ensuring continuity and reducing regulatory disruption for the pipeline industry.

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