Ultrasonic Testing (UT) Requirements Under ISO/IEC 17020
Sensitivity setting is the auditable step: the reference block used must itself be in calibration and traceable, and its identity recorded on the report. ISO/IEC 17020, enforced by Developed by the ISO Committee on Conformity Assessment (CASCO) in collaboration with.: ISO/IEC 17020 names no personnel certification scheme. Clause 6.
An auditor examining UT asks for instrument, probes, cables, couplant, and the calibration and reference blocks used to set sensitivity. ISO/IEC 17020 contains requirements for the competence and impartiality of bodies performing inspection and for the consistent operation of their inspection activities. The third edition, ISO/IEC 17020:2026, was published in March 2026 and cancels and replaces the 2012 second edition. The headline change for an inspection firm is that the categorisation of independence collapses from types A, B and C to type A and type non-A, with the independence requirements sitting in normative Annex A and impartiality requirements applying equally to both types. The edition also adds definitions of item and client, adds a subclause on control of data and information and on actions to address risks and opportunities, incorporates the common CASCO elements, and replaces some prescriptive requirements with performance-based ones.
Source: ISO/IEC 17020:2026 itself, read from the ISO-published preview: title page (third edition, 2026-03), Foreword (prepared by CASCO with CEN/CLC/JTC 1; cancels and replaces the second edition ISO/IEC 17020:2012; the listed main changes including type A / type non-A, the new item and client definitions, the new subclause on control of data and information and on actions to address risks and opportunities, the CASCO common elements, risk-based thinking and greater flexibility), Introduction (type A and type non-A reflect the level of independence; impartiality requirements apply equally to both), Clause 1 Scope, Clause 2 normative reference to ISO/IEC 17000:2020, Clause 3 definitions 3.1–3.8, Clause 4.1 and 4.2 verbatim, and the full table of contents including normative Annex A on independence requirements. Publication date: the standard's own title page gives 2026-03; European Accreditation states 31 March 2026 while ANAB's blog and UKAS's technical bulletin work from 27 March 2026 — the month is certain, the day is not, so treat 'March 2026' as the verified figure. Transition: three years from publication per an ILAC General Assembly resolution, with UKAS and ANAB citing 27 March 2029. Global ACI: ILAC's and IAF's own sites confirm Global Accreditation Cooperation Incorporated was registered as an Incorporated Society on 6 December 2024 and functions as a complete entity from 1 January 2026, with the ILAC MRA Mark transferred and the IAF MLA Mark licensed to it. A2LA R212, Specific Requirements — Nondestructive Testing Laboratory Accreditation Program, publication date 10 September 2025, read in full: general criteria are ISO/IEC 17025 for testing laboratories and ISO/IEC 17020 for inspection bodies; the nine technologies in scope; scope breakdown conventions. ANAB's NDE inspection body programme page (anab.ansi.org/accreditation/nde). IAS inspection agency accreditation to ISO/IEC 17020 (iasonline.org). Checked August 2026.
| Item | What applies | Why it matters |
|---|---|---|
| Regime | ISO/IEC 17020, Conformity assessment — Requirements for bodies performing inspection | Enforced by Developed by the ISO Committee on Conformity Assessment (CASCO) in collaboration with CEN/CLC/JTC 1. Enforced by accreditation bodies — in the United States by ANAB (which runs a dedicated NDE inspection body programme), A2LA (which covers NDT under both ISO/IEC 17020 and ISO/IEC 17025), IAS and PJLA. Since 1 January 2026 those bodies operate under the Global Accreditation Cooperation Incorporated (Global ACI) MRA, which replaced the separate ILAC MRA and IAF MLA when ILAC and IAF were wound up. |
| Method | Ultrasonic Testing (UT) | Needs its own procedure and its own qualified personnel |
| Procedure approval | The employer's Level III, qualified in this method | The signature an auditor traces |
| Other methods in scope | RT, MT, PAUT, PT, ET, VT | Each needs separate qualification |
| Renewal | ISO/IEC 17020 sets no accreditation interval of its own — the accreditation body's cycle governs, with surveillance assessments between reassessments. What is fixed is the edition deadline. Accreditation bodies have announced a three-year transition from the publication of ISO/IEC 17020:2026, with UKAS and ANAB citing 27 March 2029 as the point after which only accreditation to the 2026 edition is recognised. Existing ISO/IEC 17020:2012-based accreditations remain valid until then, and the main work is re-justifying independence under the type A / type non-A model and evidencing ongoing impartiality risk monitoring. | Applies to the personnel certification behind this method |
Does ISO/IEC 17020 require a separate procedure for UT?
Yes. Every method in scope needs its own written procedure, approved by someone qualified in that method, describing technique, equipment, calibration, scanning or coverage, acceptance criteria and reporting. A single combined "NDT procedure" covering several methods is a finding under every regime that names procedures individually.
Who can approve a UT procedure under ISO/IEC 17020?
A Level III qualified in UT. Because ISO/IEC 17020 accepts employer-based certification, that Level III may be contracted rather than employed — but their own qualification must cover UT, and an auditor will check that before accepting the signature.
What UT records does a ISO/IEC 17020 audit sample?
The approved procedure, the technician's UT certification on the date of work, and the equipment evidence — instrument, probes, cables, couplant, and the calibration and reference blocks used to set sensitivity. The auditor works backwards from a finished job, so every item has to reconcile with the report and its stated acceptance criteria.
What is the most common UT finding at audit?
An in-calibration instrument used with an unidentified or out-of-calibration reference block. It is a records failure rather than a technique failure — the examination was performed correctly and the evidence supporting it cannot be produced, which under ISO/IEC 17020 is recorded the same way as not having done the work.
Can a technician certified elsewhere perform UT under ISO/IEC 17020?
Not automatically. Employer-based certification ends when the holder leaves, so the new employer must certify them under its own written practice. Prior training and documented experience transfer as evidence; the certificate itself does not.
What equipment evidence does UT need under ISO/IEC 17020?
Calibration status traceable to the day of use, covering the instrument and its accessories — probes, cables, blocks and reference standards for ultrasonics; sources and densitometers for radiography. An in-calibration instrument with an out-of-calibration reference block fails the same way as an uncalibrated one.
How do UT requirements differ from the other methods in ISO/IEC 17020?
Scope, qualification and evidence are method-specific, so the differences are real rather than administrative. ISO/IEC 17020 also covers RT, MT, PAUT, PT, ET, and each carries its own procedure, its own personnel qualification and its own equipment evidence.
Personnel certification for UT
ISO/IEC 17020 names no personnel certification scheme. Clause 6.1 requires the body to define competence criteria and to select, train, authorise and monitor personnel against them; the inspection scheme or the client's specification decides what evidence counts, and Clause 3.3 notes that an inspection scheme can specify independence requirements. In most industrial NDT work an employer-based SNT-TC-1A or CP-189 programme satisfies clause 6.1, which means an outsourced Level III can hold the technical authority — writing competence criteria, approving procedures, signing qualifications. Where the scheme itself demands ISO 9712 certificates, clause 6.1 inherits that requirement and the outsourced Level III can no longer substitute for it.
Related: the ISO/IEC 17020 overview, outsourced ASNT Level III cover, written practice development, NDT procedure development, a programme gap assessment, interim Level III cover.