EASA Part 21

You are not required to implement all 93 Annex A controls as-is. ISO/IEC 27001 requires you to perform a risk assessment, decide which Annex A controls are applicable and proportionate, justify any exclusions, and document this in the Statement of Applicability. In regulated, brownfield manufacturing environments, feasibility, integration, and validation constraints often drive a risk-based, prioritized adoption rather than a blanket rollout.

In regulated manufacturing, it is more useful to think in KPI categories than a universal list of five. Typical examples span safety, quality, delivery, cost, and asset performance. Specific definitions, calculations, and targets must align to your processes, data quality, and validation approach, and should coexist with existing MES/ERP/QMS metrics without creating conflicting "sources of truth."

Annex A controls should not be static. In most regulated manufacturing environments, a formal review at least annually is a baseline, but many plants benefit from a risk-based cadence: annual comprehensive review, plus interim reviews after major changes, incidents, audits, or new regulatory/customer requirements. Frequency must align with your risk profile, change rate, and governance maturity.

No. NIST SP 800-171 is derived from NIST SP 800-53 but is a reduced, tailored control set focused on protecting CUI in non-federal systems. Being compliant with 800-171 does not automatically mean full alignment with 800-53, especially for control families and control enhancements that were never mapped into 800-171. Any mapping is partial and must be documented and validated.