A written practice that has not been touched since the last customer or Part 145 audit is not a written practice — it is a liability sitting in a binder. In an aerospace program built on ASNT SNT-TC-1A, the written practice is the employer's own rulebook for qualifying and certifying its UT, RT, PT, MT, ET and VT personnel, and it is the document a prime's supplier-quality auditor, a Nadcap assessor or an AS9100 registrar asks for on day one of a facility audit. Customers audit the firm against its own written practice rather than against the standard directly. The problem most quality managers run into is not writing a written practice — it is keeping one current enough to survive an audit without an ASNT Level III on staff whose full-time job is exactly that.
\nMany aerospace manufacturers, MRO shops and Tier 1/Tier 2 suppliers do not carry a full-time, in-house Level III. They carry a Level II with a lot of tribal knowledge, a quality manager wearing three hats, and a written practice inherited from whoever held the job five years ago. That gap is precisely where third-party ASNT Level III consulting earns its keep. SNT-TC-1A requires the written practice to be approved by an NDT Level III and accepts an outside agency in that role, so an outside Level III reviews, rewrites, and defends the written practice, administers or oversees the general, specific and practical examinations, and stands behind the technical basis for personnel qualification decisions when a prime's auditor or an AS9100 registrar starts asking pointed questions.
\n\nSNT-TC-1A sets the baseline: three levels; recommended minimum training and experience hours per method (for UT, 40 hours of training and 210 hours of experience for Level I, with a further 40 and 630 for Level II); General, Specific and Practical examinations with a recommended composite grade of at least 80% and no single examination below 70%; a near-vision examination (Jaeger Number 2 or equivalent at not less than 12 in.) and a colour contrast examination for the colours or shades of grey the method uses; and periodic recertification, where ASNT describes a recommended maximum interval of five years and the employer's written practice sets the actual interval. The aerospace layer comes from the purchase order: the prime's specifications and what they flow down, Nadcap AC7114 where the customer requires accreditation, AS9100 for the quality system, and the training programme of an FAA 14 CFR Part 145 repair station. Those requirements are written as mandatory floors rather than recommendations, so the written practice has to show which document governs each line, method by method.
\nIn practice, audit findings against aerospace NDT programs cluster around a small number of repeat failures:
\nAny one of these can become a major nonconformance in an AS9100D or customer-specific supplier audit, and a cluster of them can trigger a supplier probation or a hold on new work packages — the kind of finding that shows up in a scorecard review with a program manager on the call.
\n\nA defensible aerospace written practice is not a template with the company logo swapped in. It has to reflect the actual methods performed at the actual facility, the actual equipment on the floor, and the actual qualification pathway personnel follow — because an auditor will cross-reference the written practice against personnel files, and any mismatch is a finding. Building or rewriting one properly means walking the floor first: what methods are performed (conventional UT, phased array UT, digital RT, film RT, PT, MT, ET/eddy current), what specific part families and material types are inspected (aluminum forgings, titanium castings, composite bond lines, welded steel assemblies), and what the customer-specific requirements layer on top of the SNT-TC-1A baseline (two primes often have different documentation expectations even for the same method).
\nFrom there, a rewritten written practice needs to specify, method by method: the required training hours and experience hours before eligibility for Level I and Level II examination, the composition and passing score of general, specific, and practical examinations, the vision examination requirements and how often they are repeated, the recertification interval and the evidence of continued competence it requires, and any continuing NDT experience minimums a customer flows down. It also needs a clear personnel qualification record format so that when an auditor pulls five files at random, all five tell the same consistent story. Atlantis builds the aerospace written practice on ASNT SNT-TC-1A and aligns it to the customer's purchase-order flow-down requirements, prime specifications and Nadcap AC7114; the approach is set out under written practice development for aerospace.
\n\nOne of the more common gray areas in aerospace NDT programs is who actually proctors and grades practical examinations. A Level II grading another Level II's practical exam, informally, without documented independence, is the kind of arrangement that looks fine day to day and falls apart the moment an auditor asks "who verified this candidate could actually find the reference defect in the specimen, and how is that documented?" SNT-TC-1A is explicit that a certification examination is never administered by the candidate or by a subordinate, and the 2024 edition expects written-examination proctors to be trained. A third-party Level III brought in specifically for examination administration removes that ambiguity — the exam is proctored by someone with no supervisory relationship to the candidate, the specimens and acceptance criteria are documented and traceable, and the resulting certification record can be defended on its own without relying on institutional memory.
\nThis matters even more for phased array UT and digital radiography, where the practical exam has to demonstrate not just flaw detection but correct instrument setup, calibration verification, and image/data interpretation against a documented acceptance standard — skills that a generic multiple-choice general exam does not touch. The written practice has to define how those techniques build on the parent-method certification, and the practical has to be built and graded by a Level III qualified in the method, with scenarios that actually stress-test those skills rather than rubber-stamping a checklist.
\n\nSupplier quality auditors working from a prime's NDT requirements, or an AS9100D registrar running an internal or external audit, typically follow a predictable sequence: request the current written practice, select a sample of personnel certification files, cross-check training hours and vision exam dates against the written practice's stated requirements, then trace one or two specific inspection records back to the technician's certification file to confirm the person who performed the inspection was qualified to perform it on the date they performed it.
\nPrograms that pass this cleanly share a few traits: the written practice is version-controlled with a clear revision history and approval signature from the responsible Level III, personnel files are organized identically across all technicians (same document order, same naming convention), vision exam records are current and filed with the certification package rather than scattered in HR files, and there is a visible record of Level III program oversight — not just a signature on the written practice cover page, but periodic documented review of procedures and personnel qualifications. Building that audit trail from scratch, or repairing one that has drifted, is faster with an outside Level III who has prepared other facilities for the same audit and knows exactly which five questions get asked first. Atlantis provides that as Level III audit support for aerospace.
\n\nA written practice and a clean audit trail solve the compliance half of the problem. The operational half is making sure certification records, training hour logs, vision exam schedules, and equipment calibration dates do not live in five different spreadsheets maintained by five different people. Aerospace suppliers that consolidate this into a single system — tracking each technician's certifications, expiration dates, training hours by method, and upcoming renewal deadlines alongside equipment calibration schedules — stop finding out about a lapsed certification the week before an audit and start getting warning weeks ahead instead.
\nThis is where an NDT-specific ERP system earns its place in an aerospace quality program: automated alerts before a Level II's certification lapses, a single source of truth an auditor can be handed directly instead of assembling a binder the night before, and calibration tracking tied to the same personnel and equipment records the written practice references. Pairing that operational backbone with ASNT Level III consulting for the written practice and examination program, plus NDT training for the technicians themselves, closes the loop from qualification through daily execution.
\n\nQuality managers sometimes hesitate to bring in a third-party Level III, worried it signals to auditors that the internal program is weak, or that it creates dependency on an outside consultant. In practice, the opposite is usually true. Auditors from primes see internal NDT programs across many suppliers, and a program with documented, qualified Level III oversight — whether that Level III is a W-2 employee or a contracted consultant under a documented scope of work — reads as more mature than one where a Level II is quietly making Level III-level calls without the credential to back it up. SNT-TC-1A accepts an outside agency Level III, and a firm with no Level III on staff routinely engages one; what auditors look for is documented, qualified, traceable oversight. A well-scoped consulting engagement provides that cleanly, with a clear statement of work defining what the Level III reviewed, approved, and signed off on.
\n\nAn effective engagement usually starts with a gap assessment against SNT-TC-1A, the facility's own written practice, and the specific customer flow-downs that apply — not a generic checklist, but a method-by-method, file-by-file review against what the facility actually inspects. From there, the deliverables are concrete: a rewritten or updated written practice with revision control, a corrected and complete set of personnel qualification files, a documented practical and general examination program with retained specimens and question banks, a vision examination schedule with responsible parties named, and a documented Level III oversight cadence going forward (quarterly file review, annual written practice review, examination administration on a defined schedule). The engagement should end with the facility able to hand an auditor a clean, internally consistent package — not with an open-ended retainer that never produces a finished program.
\nFor facilities preparing for a specific upcoming audit — a new prime source approval, a supplier requalification, a Nadcap AC7114 audit or a routine AS9100 surveillance audit — the timeline matters as much as the content. A focused engagement can take a program from "we think we're okay" to "here is the file, ask us anything" in a matter of weeks rather than months, provided the facility can make personnel and records available promptly and the scope is defined against the actual audit checklist rather than a generic summary of the standard.
\n\nAerospace suppliers performing NDT as a special process are often required by their customers to hold Nadcap accreditation for the relevant method — assessed against AC7114, the Nadcap audit criteria for nondestructive testing, and its method slash sheets such as AC7114/1 for penetrant, /2 for magnetic particle, /3 for ultrasonic, /4 for film radiography and /5 for eddy current, administered through PRI. Nadcap auditors reviewing an NDT special process do not treat personnel qualification as a side issue; it is a core subject area, assessed against the written practice and the qualification requirements the facility's customers flow down. A facility that has cleaned up its written practice and personnel files for a customer supplier audit but has not synchronized that work with its Nadcap self-assessment and audit prep is doing the work twice, inconsistently, and risking a mismatch between what one auditor saw and what the next one finds.
\nThe practical fix is treating the written practice, personnel qualification records, and procedure set as a single audit-ready package that serves customer supplier audits, Nadcap AC7114 audits, and internal AS9100 surveillance audits simultaneously — because all three pull from the same underlying facts about who is qualified to do what, on what equipment, under what procedure. A third-party Level III scoping the engagement around this shared foundation, rather than treating each audit type as a separate project, saves the facility from repeatedly re-explaining the same qualification story to three different audiences in three slightly different formats. The records an assessor pulls first are covered under Nadcap AC7114 audit readiness.
\n\nConsider a hypothetical Tier 2 structures supplier with a few dozen NDT technicians across UT, PT, and MT, serving one prime directly and a second through a Tier 1 integrator. A customer supplier-quality visit flags three findings: two technicians whose vision examinations had lapsed by several weeks, a written practice citing a different edition of SNT-TC-1A than the one the purchase order names, and no documented evidence of the named Level III's periodic file review beyond the signature on the written practice cover page.
\nNone of these findings individually threatens the supplier relationship — but a cluster of personnel-qualification findings reads as a program-maturity signal, and a repeat finding at the next visit is treated far more seriously than the first, typically as a formal corrective action request with a defined closure deadline. The fix here is not complicated: take the two technicians off certified work until their vision examinations are repeated and documented, correct the written practice's edition reference and republish it with a documented approval signature and date, and establish a quarterly file-review cadence with the Level III's review documented in writing each quarter — a one-page log is often enough, as long as it exists and is dated. What separates a facility that fixes this permanently from one that sees the same finding again next year is whether that quarterly cadence actually happens, which is exactly the kind of ongoing accountability an outside Level III consulting relationship, scoped explicitly to include it, is built to sustain.
\n\nFacilities that get the most value from third-party Level III consulting typically do not treat it as a one-time cleanup project. A defined ongoing relationship — quarterly file review, annual written practice revalidation against the SNT-TC-1A edition your purchase orders name and any customer flow-down changes, and on-call availability ahead of a known audit — costs less in disruption than a reactive scramble every time an audit notice arrives, and it produces the kind of consistent, dated documentation trail that auditors read as genuine program maturity rather than audit-week theater.
\nAtlantis provides ASNT NDT Level III consulting for aerospace and aviation programs, led by an ASNT NDT Level III in UT, RT, MT, PT and VT, and can act as the outside agency Level III for an SNT-TC-1A written practice within those methods; how that role is set up is covered in the aerospace Level III role. Technicians train through ASNT SNT-TC-1A-based aerospace NDT training and aviation NDT training, and aerospace NDT inspection services cover the work that cannot wait. Scope and quote on request — request a consultation.
\n\nAtlantis NDT pairs field expertise with software: NDT inspection management software — Atlantis ERP, a digital twin platform for asset integrity, and NDT reporting software. Build your team with NDT training to ASNT SNT-TC-1A and ASNT certification pathways, or bring in ASNT Level III consulting. Scoped to your programme, quote on request — request a consultation.
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