NAS 410 / EN 4179 Audit Preparation for Inspection Companies
A NAS 410 / EN 4179 audit runs in 6 stages, beginning with apply for nadcap accreditation through pri's eauditnet / eansm platform and select.. Aerospace Industries Association (AIA) publishes NAS 410, distributed through Accuris. EN 4179 is prepared by ASD-STAN and published through CEN.
NAS 410 sets minimum requirements for qualifying and certifying Level 1, Level 2, Level 3 and Senior Level 3 personnel performing NDT, NDI or NDE in the aerospace manufacturing, service, maintenance and overhaul industries. Revision 6 was released by AIA and Accuris on 1 December 2025 and introduces a new Appendix D creating an additional pathway to Level 3 qualification, under which Level 2 personnel complete designated NDT activities that earn points toward qualification. EN 4179 is technically equivalent as published; the 2026 edition superseded EN 4179:2021 and carries annexes on the Level 3 recertification credit system, Level 1-limited personnel, and NANDTB requirements. Personnel certified to earlier revisions need not recertify until their current certification expires. What separates firms that clear an audit from firms that collect findings is not the quality of the documentation but whether it describes what actually happens. The finding recorded most often is: Self-audit not performed, or performed without all applicable job audits — consistently among the most-cited AC7114 nonconformances
Source: AIA press release, 'AIA and Accuris Release NAS410 Revision 6, Advancing Aerospace Safety and Workforce Development' (aia-aerospace.org) — release date 1 December 2025, Appendix D points-based Level 2 to Level 3 pathway, Accuris as sole source for AIA subscription content. NAS 410 Rev 5 (2020) scope and the four levels (Level 1, 2, 3, Senior Level 3) from standard catalogue records. NAS 410 paragraph 4.5 'Responsible Level 3' wording quoted from ndt.net technical forum discussion citing the standard text; treat the paragraph number as indicative and confirm against Rev 6. EN 4179:2021 (BS/DS editions) and EN 4179:2026, listed by BSI and DIN distributors as the current edition published 2026, superseding EN 4179:2021 — verified through distributor catalogue listings rather than the CEN portal. FAA/EASA harmonisation and technical equivalence of EN 4179 and NAS 410 from published NDT qualification literature and the FAA's NDT memorandum for production approval holders. Nadcap AC7114 audit content, top nonconformances and the Supplier Merit Program 12/18/24-month intervals from PRI (p-r-i.org) course outlines and Nadcap programme material, plus Quality Magazine's Nadcap NDT audit perspective. Checked August 2026.
| Stage | What happens | What it tests |
|---|---|---|
| Stage 1 | Apply for Nadcap accreditation through PRI's eAuditNet / EANSM platform and select the AC7114 checklists matching the methods and techniques. | Where the paperwork is tested against itself |
| Stage 2 | Complete the self-audit against those checklists including all applicable job audits, and send the required package to the auditor 30. | Where the paperwork is tested against practice |
| Stage 3 | On-site audit covering scope and general information, customer and procurement requirements, internal NDT audits, personnel proficiency and certification records, examinations. | Where the paperwork is tested against practice |
| Stage 4 | Auditor uploads nonconformance reports; the supplier responds with root cause and corrective action, reviewed by PRI staff engineers | Where the paperwork is tested against practice |
| Stage 5 | The Nadcap NDT Task Group votes to accredit, fail, or issue merit | Where the paperwork is tested against practice |
| Stage 6 | First reaccreditation audit within twelve months of the initial audit; subsequent reaccreditation intervals extend to 18 or 24 months under. | Where the paperwork is tested against practice |
| Renewal | Personnel certification expiry is set by the employer's written practice; NAS 410 states that personnel certified to previous revisions of NAS 410 or EN 4179 need not recertify to the requirements of the new revision until their current certification expires. The company-level cycle is separate and defined by Nadcap: the first reaccreditation audit falls within twelve months of the initial audit, after which the Supplier Merit Program can extend the interval to 18 or 24 months depending on audit performance. | Diarised from the certificate date, not the last audit |
How long does NAS 410 / EN 4179 audit preparation take?
Document work — the written practice, procedures and quality manual — takes weeks. What cannot be compressed is documented experience and records history: on-the-job hours accrue in real time, and calibration and certification history cannot be back-filled. Firms that start when the audit is scheduled rather than announced clear it without findings.
What does Aerospace Industries Association (AIA) publishes NAS 410, distributed through Accuris. EN 4179 is prepared by ASD-STAN and published through CEN. Enforcement is by the airframe and engine primes through purchase-order flow-down, by the Performance Review Institute (PRI) through Nadcap audits to AC7114, and by aviation regulators — the FAA treats personnel qualified under EN 4179 as technically equivalent to NAS 410. National Aerospace NDT Boards (NANDTBs) operate in countries that have established them. look at first?
Records, not manuals. A manual states intent; records show practice. The usual opening move is to take a completed job and trace it back to the technician's certification, the instrument's calibration, the approved procedure and the report — and see whether all four reconcile.
What are the most common NAS 410 / EN 4179 findings?
Self-audit not performed, or performed without all applicable job audits — consistently among the most-cited AC7114 nonconformances, Required pre-audit package not sent to the auditor 30 days before the audit, Corrective actions from the previous Nadcap audit no longer implemented at the following audit, Calibration requirements not flowed down to subcontracted calibration or subcontracted NDT services. Almost all of them are evidence problems rather than capability problems: the work was done correctly and the proof was not kept, or was kept somewhere the firm could not retrieve during the audit.
Can a consultant attend the NAS 410 / EN 4179 audit?
Yes, and it changes the outcome. Someone who has sat through the same audit at other firms answers in the auditor's own terms, produces the right record without a search, and stops a clarification turning into a finding. The firm still owns every answer — the consultant does not speak for it.
What happens after a NAS 410 / EN 4179 finding?
A corrective action with a deadline, and evidence of closure at the next audit. Repeat findings are treated far more seriously than first ones, because they show the corrective-action system itself is not working.
Does NAS 410 / EN 4179 require a pre-audit or gap assessment?
Not as a requirement, but the arithmetic favours it: a gap assessment finds the same evidence problems the auditor would, without the finding attached, and while there is still time to fix them. Firms entering their first NAS 410 / EN 4179 audit blind typically collect findings that a sampling exercise would have caught.
What the auditor asks to see
- Written practice for the training, qualification and certification of NDT personnel, approved by the Responsible Level 3
- Written designation of the Responsible Level 3, plus that person's Level 3 certification records and evidence of knowledge of the employer's codes and specifications
- Individual qualification files: training, experience, General, Specific and Practical examination results, and vision test records
- Documented determination by the Responsible Level 3 — or by a NANDTB where one applies — of the adequacy and equivalency of experience carried in from a prior employer or programme
- NDT procedures and work instructions for each method and technique, approved by the Responsible Level 3
- Customer and procurement requirement flow-down records showing which prime specifications apply to which work
- Internal NDT audit records, plus evidence that corrective actions from the previous Nadcap audit remain implemented
- Equipment calibration, system performance check and process control records, including calibration requirements flowed down to subcontractors
- The completed AC7114 self-audit package, including all applicable job audits, sent to the auditor before the audit
Findings to close before the audit
- Self-audit not performed, or performed without all applicable job audits — consistently among the most-cited AC7114 nonconformances
- Required pre-audit package not sent to the auditor 30 days before the audit
- Corrective actions from the previous Nadcap audit no longer implemented at the following audit
- Calibration requirements not flowed down to subcontracted calibration or subcontracted NDT services
- Written procedure and observed practice disagree during a job audit — the technique the operator ran is not the technique the procedure specifies
- Equivalency of experience carried in from a prior employer or programme not evaluated and documented by the Responsible Level 3 or the NANDTB
- Written practice not approved, or not re-approved, by the current Responsible Level 3 after a personnel change
- Process timing steps missed during a job audit — PRI's published lists cite eddy current step-one timing among the recurring job-audit nonconformances
- US firm holding only a NAS 410 Level 3 finds it insufficient for a European customer who requires a NANDTB-approved Level 3
Related: the NAS 410 / EN 4179 overview, outsourced ASNT Level III cover, written practice development, NDT procedure development, a programme gap assessment, interim Level III cover.