One certificate, one method — and the signature block that gives you away

The finding, as auditors actually write it

The wording changes but the shape does not: no objective evidence that the NDT Level III who approved this procedure holds current certification in the applicable method. It is written against fabrication shops, inspection contractors, and in-house inspection departments, by ISO 9001 registrars, API auditors, Nadcap auditors and clients' technical authorities alike. It is not an interpretation dispute. It is a document comparison, and the documents are both in the audit pack you handed over.

A published example makes the mechanics concrete. In an audit discussed on ndt.net against ASME Section V and SNT-TC-1A, an auditor raised a non-conformance because the visual testing written practice had been prepared by a welding inspector rather than by NDT personnel, SNT-TC-1A references were absent from the training and certification records, and there was no evidence that an ASNT NDT Level III held current certification in visual testing. The firm disputed adjacent points about hydrostatic testing; that first one it could not.

What makes this finding expensive is its blast radius. A procedure approved by somebody without the method certification puts every examination performed to that procedure into question, along with every report issued from those examinations and every certification signed off on that basis. A single signature block can reopen two years of deliverables, which is why closing it is worth more than the hour it takes to find.

For which qualified — the four words doing the work

SNT-TC-1A describes the NDT Level III as capable of establishing techniques, interpreting codes, standards, specifications and procedures, and designating the methods, techniques and procedures to be used — and as responsible for the NDT operations for which qualified and assigned. The qualifier at the end is the whole argument. Capability language describes what a Level III does in general; the responsibility clause bounds it to the methods the individual actually holds.

This reading is not a strict interpretation invented by auditors. It is how the certification structure is built. ASNT issues the NDT Level III credential on a Basic examination plus one or more method examinations, and each method passed adds that method to the credential. If the intent were that a Level III in any method could act across all methods, the separate method examinations would serve no purpose. The credential is method-scoped by construction.

The practical translation for a QA manager is short. List every NDT method your company performs, sells or certifies people in. Against each, name the individual whose method certification covers it. Any method with a blank against it is an open finding, whether or not an auditor has arrived yet. Firms taking this seriously do the exercise annually alongside an NDT programme audit and gap assessment rather than in the week before a surveillance visit.

Your certification record has a limitations field, and it is not decorative

SNT-TC-1A Section 9 sets out what the personnel certification record holds, and the second item on the list is the level of certification, the NDT method and technique as applicable, and limitations if any. That last clause is the mechanism the standard gives you for recording a bounded scope, and it is chronically left empty. A blank limitations field on a certificate is a positive assertion that the individual is competent across the full method, which is a claim somebody has to be willing to defend.

Limitations are useful in both directions. A Level II certified in UT but restricted to thickness measurement, or in RT but restricted to interpretation and not radiation-producing operations, is a real and defensible arrangement provided the record says so. Where the field is left blank to avoid awkward conversations, the firm has traded a documented restriction for an undocumented exposure, and the exposure surfaces during an incident rather than during an audit.

The same discipline applies at Level III. A Level III certification record listing UT and MT is a clean document; the problem arises when the same individual's signature appears on RT and PT procedures with nothing in the file explaining why. Getting the record fields right is one of the standard corrections we make when rebuilding a programme's written practice, because the record and the practice have to describe the same scopes.

Four documents where method scope actually bites

Procedures and technique sheets are the obvious one. Every NDT procedure carries an approval block, and that approval has to come from a Level III certified in the method the procedure describes. This includes the derived documents: RT technique sheets and shooting sketches, UT scan plans, MT technique variations for different part geometries. Firms that get the master procedure right frequently miss the technique sheets, which are approved on the shop floor under time pressure.

Examination administration is the second, and it is enforced explicitly in aerospace. Nadcap AC7114 criteria require practical examinations to be administered by the Responsible Level 3 or by an examiner certified in the applicable test method. The logic is unarguable — an examiner who cannot perform the method cannot judge whether the candidate performed it correctly — and the same logic applies outside aerospace even where the text is softer. Our examination oversight engagements exist largely to fill this gap.

The third is certification sign-off itself, where the Level III signature verifying a Level II's certification has to come from someone certified in that method. The fourth is report and interpretation review, where a Level III adjudicating a disputed call or countersigning a final report is exercising method judgement. Each of these leaves a dated signature in a file, and each is checked. The boundaries of an outside Level III's authority apply identically to an employed one.

Why a UT Level III genuinely cannot approve an RT procedure

Strip away the compliance framing and the technical case stands on its own. Approving a radiographic procedure means judging source selection and activity, source-to-film distance against geometric unsharpness, film system class and screen selection, density and contrast requirements, IQI type, placement and the essential hole or wire to be resolved, exposure calculations, back-scatter control, and the radiation safety envelope around all of it. None of that knowledge is contained in ultrasonic qualification, and none of it is acquired by proximity.

The examination structure prices the difference. ASNT sets its NDT Level III RT method examination at 135 questions over four hours, the same weight as UT, ET, LT and AE, while MT, PT, VT, IR and MFL run 90 questions over two hours. Those are not administrative distinctions; they reflect how much method-specific body of knowledge sits behind each credential. A UT Level III has demonstrated the UT body of knowledge and nothing else.

The reverse case is equally real and less often discussed. An RT Level III approving a phased array procedure is making judgements about focal laws, wedge selection, encoder calibration, scan plan coverage and sizing technique that radiographic qualification never touched. The finding is symmetrical, and firms that have grown from one method into several accumulate it in whichever direction they expanded.

Covering a method your Level III does not hold — four routes that work

Route one is contracting. Engage an outside Level III certified in the missing method to review and approve those procedures, administer and grade those examinations, and countersign the certification records. This is the fastest route and the one most small firms use, and it does not transfer responsibility away from the employer — the employer still certifies its own people. Our interim and ongoing Level III cover is built for exactly this pattern.

Route two is adding the method. Send the in-house Level III to the ASNT method examination for the missing method — 135 questions and four hours for UT, RT, ET, LT and AE, 90 questions and two hours for MT, PT, VT, IR and MFL, with the Basic examination already behind them. This is the strongest long-term answer for a method the firm sells regularly, because it removes an external dependency from routine work.

Route three is written delegation, where the governing standard supports it. NAS 410 practice allows a Responsible Level 3 to delegate in writing to another Level 3 for specified methods while retaining final approval authority over the written practice and the training and examination programme. The delegation has to be documented, method-specific and current. Route four is the honest one: withdraw the method from your scope of supply until one of the first three is in place.

The multi-Level-III arrangement, and who stays responsible

Larger organisations run several Level IIIs with a defined split, and the arrangement is entirely normal — separate individuals holding MT, RT and UT, with one of them named as the responsible or corporate Level III for the programme as a whole. The responsible role is supervisory and programme-wide: approving the written practice, owning the examination system, interfacing with auditors and regulators. Method authority sits with whoever holds the method.

The failure mode in these arrangements is ambiguity rather than absence. Two Level IIIs, both competent, neither named against specific documents, and a procedure set where the approval signatures were whoever was in the office that week. The fix is a one-page authority matrix in the written practice: method down the left, named individual and certificate number across, with the delegation reference where the individual is external. Auditors accept clarity; they write findings against vagueness.

Outside Level IIIs slot into that matrix on the same terms as employees, with one boundary that stays fixed. An outside agency or contracted Level III qualifies and examines; the employer certifies. That division holds under SNT-TC-1A and under NAS 410 practice, and it means a contracted method specialist strengthens your programme without ever taking your certification decisions away from you.

CP-189 and NAS 410 raise the bar above SNT-TC-1A

SNT-TC-1A is a recommended practice, and it leaves the employer to decide how a Level III demonstrated method competence — an ASNT certificate, or an employer-administered basic, method and specific examination sequence. ANSI/ASNT CP-189 removes the discretion. Under CP-189 the Level III candidate has to hold ASNT NDT Level III certification in the method for which certification is sought, which converts the method-scope question into a certificate check with no room for interpretation.

That single difference reshapes the compliance picture for anybody whose client contracts invoke CP-189 rather than SNT-TC-1A. A firm whose Level III was qualified in-house across four methods under a well-written practice can find that only the two methods carrying ASNT certificates survive the transition. Reviewing your contract stack for which standard each client actually invokes is worth doing before a client does it for you, and our CP-189 compliance notes set out the differences against SNT-TC-1A.

Aerospace applies a third pattern through NAS 410 and Nadcap. The Responsible Level 3 has to be certified in one or more methods the employer uses and be well versed in the codes and specifications the employer works to, and practical examinations have to be administered by that person or by an examiner certified in the applicable method. A firm holding both an ISO 9001 registration and a Nadcap accreditation is answering to the stricter of the two on every method it runs.

How auditors detect the mismatch in under an hour

The procedure is mechanical and any competent auditor knows it. Collect the Level III certificates and note the methods and expiry dates on each. Collect the procedure index and note the approver and date on every procedure and technique sheet. Cross-reference. Any procedure whose approver has no certificate covering that method on that date is a finding, and the audit trail is two documents long. No interviews, no interpretation, no argument.

The second pass goes to examinations. Pull a sample of certification records, look at the grader signature on the practical checkpoint sheets, and compare against the same certificate list. Then look at the limitations field on each record, and at whether the record's method matches the methods the individual actually performs on site. The third pass is the written practice: does it name who is authorised for which method, and does the naming match reality.

Everything an auditor needs is in the pack you supply voluntarily, which means you can run the same three passes yourself first. Firms that do this discover the gaps at a point where all four coverage routes are still open, rather than during a closing meeting where only the expensive ones are. Atlantis runs this cross-reference as a fixed-scope review — affordable, accessible and fully customizable — and returns the authority matrix along with it. Request a quote or a demo.

Visual and leak testing: the two methods that generate the finding

Visual testing is where this goes wrong most often, because it does not feel like NDT. It is performed by welding inspectors, described in weld inspection procedures, and treated as a craft skill. ASME Section V disagrees: VT is a method with its own article and its own procedure variables table, and a VT procedure needs approval by a Level III certified in VT like any other. The documented audit case above turned on precisely that mismatch.

Leak testing collects the same problem from a different direction. Bubble, pressure change, halogen diode and mass spectrometer techniques are treated as pressure testing rather than examination, and end up in mechanical completion procedures signed by process engineers. Where a construction code routes leak testing to Section V Article 10, the procedure needs a Level III certified in LT. Where it does not, the argument is worth having with the auditor from a documented position rather than an improvised one.

Both cases share a root cause: methods that arrived through operations rather than through the NDT department were never brought under the written practice. The corrective action is the same in both — add the method to the written practice, name a certified Level III against it, bring the procedure under the same approval route as every other method, and update the certification records so the method appears where an auditor expects to see it.

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