ASNT Level III consulting for NAS 410 written practice, Nadcap AC7114 and prime approvals

Three approvals stack, and the middle one fails

An aerospace supplier performing NDT carries three separate approvals, and they fail in a predictable order. AS9100 certifies the quality management system and treats NDT as a special process requiring validation and control of the process itself. Nadcap accreditation audits the NDT operation against AC7114 and the method checklists. Prime approval — a listing of the kind Boeing maintains as D1-4426 Approved Process Sources — then authorizes work against that prime's specifications. The middle layer is where audits are lost, because it is the only one that examines method practice line by line.

The reason is scope. An AS9100 auditor confirms that a special process is identified, validated and controlled. An AC7114 auditor opens the penetrant line, watches a process control check being run, reads the last twelve months of system performance results, and asks who dispositioned the two that failed. That second conversation demands records generated daily by production staff and reviewed by a Level 3, and those records are produced under time pressure by people whose primary job is throughput.

The third layer amplifies whatever the second layer got wrong. Prime listings are granted against a stated scope of methods and specifications. When the Nadcap scope of accreditation and the prime process code listing drift apart — a method added at one and not the other, a specification revision adopted at one and not the other — the mismatch surfaces during a prime surveillance rather than during a Nadcap audit, and it surfaces as a purchase order hold rather than as a finding with a closure period.

NAS 410 is the personnel standard in aerospace scope

Under all three approval layers sits NAS 410, published by the Aerospace Industries Association, with EN 4179 as its harmonized European counterpart. NAS 410 governs qualification and certification of NDT personnel for aerospace work, and it is the standard prime specifications and AC7114 checklists reach for. A written practice citing SNT-TC-1A in an aerospace scope is a finding on the first document opened, and it is a finding that propagates, because every certification issued under that written practice inherits the defect.

The substantive difference is not the training hour tables. It is the accountability architecture. SNT-TC-1A is a recommended practice that an employer adapts to its own needs, and it distributes certification authority without designating a single accountable individual. NAS 410 designates one Responsible Level 3 as the final authority for the NDT program, with approval rights over the written practice, over instructors, over examination material and over the certification decisions issued in the employer's name.

NAS 410 also fixes the physical qualification cycle that programs most often let lapse. Rev 5 requires near vision examination annually and color perception examination at least every five years, against the criteria in Table V, with correction worn during all testing where correction is needed to pass. Programs track the annual test because it recurs visibly and lose the five-year test because it does not. That single asymmetry produces a recurring personnel finding at audit after audit.

One Responsible Level 3, named in writing

The Responsible Level 3 is a single individual the employer designates to oversee all qualification and certification activity and to serve as the final authority for the NDT program. That individual develops, documents and implements the written practice, verifies the credentials of anyone administering examinations, approves or designates instructors, approves classroom and practical training material, and approves the examination practices under which certificates are issued. This is a role, held by a named person, not a certification level.

Two documents are involved and auditors ask for both. The Level 3 certificate evidences the individual's own qualification in a method. The designation document appoints that individual as the Responsible Level 3 for the organization. Producing the certificate when asked for the designation is one of the fastest non-conformances an audit generates, and it happens because organizations assume the certification implies the appointment. It does not, and the written practice has to reference the appointment explicitly.

Where the Responsible Level 3 is retained rather than employed, the arrangement has to give the role real authority and leave an evidence trail proving it was exercised — approvals signed, examinations reviewed, procedures released, site visits recorded. An auditor tests whether the role is functional or nominal by asking when the Responsible Level 3 was last on site and what they last approved. The full requirement set is on the NAS 410 Responsible Level 3.

The AC7114 checklist family and what each one drives

AC7114 is the baseline Nadcap NDT audit criteria, and the method checklists carry the detail. AC7114/1 covers penetrant, AC7114/2 magnetic particle, AC7114/3 ultrasonic, AC7114/4 film radiography and AC7114/5 eddy current, with further checklists for additional applications. A supplier is audited against the baseline plus each method checklist in its requested scope. Adding a method to a scope adds a checklist, and each checklist brings its own process control, reference standard and record requirements.

The checklists are written as questions an auditor asks with a document in hand. They drive daily and periodic system performance checks, control of reference standards and comparator blocks, process parameter control, lighting and environment verification where the method requires it, and the approval chain for every procedure. Where a customer specification is invoked, the checklist asks whether the procedure reflects the current revision of that specification and whether the customer approved the procedure where approval is required.

Because the checklists are revised on a rolling basis and audits are conducted against the revision current at the audit date, readiness work has to start from the applicable revision rather than from the copy in the quality file. The sequencing and content of a full readiness program is covered on Nadcap AC7114 audit readiness; this page routes there rather than duplicating it.

Where AC7114 non-conformances concentrate

Published Nadcap NDT commentary puts three categories at the top of the non-conformance list: self-audit, calibration flow-down, and procedure requirements. All three are document controls. None requires an auditor to dispute an indication call. That is the same pattern seen across NDT audits generally, where findings cluster on records rather than on technique, and it is the reason readiness work aimed at paper closes more findings per hour than readiness work aimed at method practice.

The self-audit finding has a specific shape. AC7114 expects the supplier to audit itself against the same checklists before the auditor arrives. A self-audit that is missing is one finding. A self-audit that exists but returns zero findings, signed by the person who wrote the procedures being audited, is a worse one, because it tells the auditor the internal control is decorative. A credible self-audit finds things, records them, and shows closure with objective evidence.

Calibration flow-down fails at the boundary. In-house instruments are calibrated and certificated; the subtier laboratory that calibrated the master gauge was never told what requirements applied; certificates arrive without traceability statements or without as-found data, so nothing can be reconstructed if an instrument is later found out of tolerance. Procedure findings cluster on approval authority and specification currency — a Level 3 approving outside their certified method, or a procedure still referencing a superseded customer specification revision.

Prime approvals sit on top of Nadcap

Nadcap accreditation is a condition of prime approval rather than a substitute for it. Boeing maintains D1-4426, its approved process sources program, covering special processes including NDT; suppliers and their subtiers must use approved sources for the processes it controls, and process code listings identify which sources are approved for which specifications. Other primes operate equivalent programs under their own document numbers. Both the accreditation and the listing have scopes, and both have to be kept aligned.

Scope drift is the failure mode. A supplier adds eddy current capability, adds AC7114/5 to its Nadcap scope, and never updates the prime listing — or adopts a new revision of a prime specification in its procedures without confirming the listing covers it. The mismatch is invisible internally because both documents look current in isolation. It surfaces at receiving inspection or at a prime surveillance, and it stops parts rather than generating a corrective action request with a closure window.

The control is a single scope register that carries every method, every customer specification and revision, the Nadcap checklist covering it, the prime listing and process code covering it, and the Level 3 certified to approve procedures for it. One document, reviewed on a fixed cycle, reconciles four external systems that otherwise drift independently. Building and maintaining that register is standard content in an Atlantis aerospace engagement.

The record trail NAS 410 demands

Personnel records carry the audit once the process controls are in order. NAS 410 expects evidence of training, of documented experience, and of general, specific and practical examinations, all traceable to the individual's certification and all approved under the authority of the Responsible Level 3. The recurring gap is the practical examination — evidenced as a line in a spreadsheet with a date and a score, with no record of what was examined, on what specimens, graded by whom, against what criteria.

Experience records fail the same way they fail everywhere. Hours claimed at hire, never broken out by method, never dated, never signed by a supervising Level 2 or Level 3. An auditor asks the technician a single question — how many hours in eddy current, and who signed for them — and the file cannot answer it. The remedy is a dated per-method log with supervisor signatures, started immediately, plus a documented reconstruction basis for historical hours that states plainly what evidence supports them.

Examination material control is the third piece: authorship, custody, revision and retention of the question banks and practical specimens. Where the same individual trains, examines and grades without independence controls, the certification is exposed regardless of the paper behind it. Atlantis covers authorship, grading independence and retention on NDT Level III exam oversight.

AS9100 and NDT as a special process

AS9100 requires that processes whose output cannot be verified by subsequent measurement are validated and revalidated, with controls over methods, equipment, personnel qualification and records. NDT sits squarely inside that requirement, which is why an AS9100 auditor asks whether NDT is identified as a special process and whether its personnel qualification and process controls are defined — and then stops, because depth belongs to the AC7114 audit.

The interface matters for corrective action. A Nadcap non-conformance is a quality system input under AS9100, and a supplier whose corrective action system never receives its Nadcap findings has an AS9100 problem in addition to the original NDT problem. Routing every AC7114 finding through the same corrective action process used for customer complaints and internal audit findings closes that gap and produces the trend data an auditor asks for at the next surveillance.

Purchasing controls are the second interface. Where NDT is subcontracted, AS9100 purchasing requirements and prime approved-source requirements both apply, and the flow-down has to name the specification, the revision, the accreditation required and the record the supplier must return. Subcontracted NDT with a purchase order that names only a method and a part number is a finding available to any of the three audit layers.

How an aerospace readiness engagement is sequenced

Sequence follows dependency. The written practice is rebuilt first, against NAS 410 and against the revision your customer specifications invoke, with the Responsible Level 3 designation issued and referenced. Everything downstream inherits from that document, so remediating personnel files before fixing the written practice means doing the personnel files twice. Instructors, examination material and certification records are then reissued under the corrected practice with a documented transition basis.

Process controls follow. Each method in scope is walked against its AC7114 checklist at the current revision: system performance checks, reference standards, process parameters, environment, records and procedure approval authority. Findings are logged as the auditor would log them, with objective evidence required for closure. A self-audit is then run as a genuine audit rather than as a formality, and its findings and closures become the record the Nadcap auditor reads first.

Continuing support is where most of the value sits, because AC7114 revisions, specification revisions and personnel expiries all move independently between audits. Atlantis operates as the retained Level 3 for procedure approval and examination oversight, maintains the scope register reconciling Nadcap and prime listings, and runs a mock audit before the assessment. Engagement structure is described on outsourced NDT Level III consulting. Request a quote against your method scope, site count and customer specifications.

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