SNT-TC-1A Audit Preparation for Inspection Companies

A SNT-TC-1A audit runs in 6 stages, beginning with eligibility check and application to asnt's employer-based certification (ebc) accreditation program, submitting.. American Society for Nondestructive Testing (ASNT) publishes it. Nobody enforces SNT-TC-1A directly — it becomes binding when a code, customer or regulator invokes it (ASME BPVC Section V and Section VIII, AWS D1.1, the API inspection codes, prime purchase orders).

SNT-TC-1A is a recommended practice, not law. It gives an employer the framework for qualifying and certifying its own NDT personnel. For an inspection service provider the deliverable is a Written Practice covering training, examination, experience, vision and recertification for every method and level the firm sells, reviewed and approved by the employer's NDT Level III and retained on file for audit. Customers then audit the firm against its own Written Practice rather than against the standard directly. The 2024 edition adds the ASNT 9712 Program to the recognised examination routes, restricts eye drops used to improve vision, tells employers to assess whether externally referenced examinations meet their requirements, and expects written-examination proctors to be trained. 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.

Source: ASNT Recommended Practice No. SNT-TC-1A (2024), with Addendum — ASNT product listing (source.asnt.org) and ASNT standards page (asnt.org/standards-publications/standards); the addendum took effect May 2025 and ASNT recommends use with ANSI/ASNT CP-105 (2024). ASNT 'Ten Key Shalls of SNT-TC-1A' and 'What to Do in an Audit' (asnt.org blog). ASNT Employer-Based Certification Accreditation Program, certification.asnt.org — audit stages, three-year validity and published audit fees (single site and multi-site up to 150 technicians US$5,300; 151–500 technicians US$6,150; 500+ by quote), checked August 2026. 49 CFR 192.243(a)–(b) quoted from the govinfo CFR text. ASME Section V Article 1 T-120 and Section VIII Div. 1 UW-54 taken from secondary technical summaries, not read from the code; treat the clause designations as indicative. Vision examination frequency deliberately not stated as a number here — it was not verified against the 2024 text.

SNT-TC-1A audit — stages and what each tests
Stage	What happens	What it tests
Stage 1	Eligibility check and application to ASNT's Employer-Based Certification (EBC) Accreditation Program, submitting the signed application and payment, the Written Practice,.	Where the paperwork is tested against itself
Stage 2	Desktop audit: a qualified auditor reviews the Written Practice against SNT-TC-1A; the firm has 30 days to respond to nonconformances.	Where the paperwork is tested against practice
Stage 3	Compliance audit, conducted remotely, of actual certification packages against the firm's own Written Practice; 30 days to respond and 60.	Where the paperwork is tested against practice
Stage 4	Panel review by a three-person independent panel confirming all accreditation requirements are satisfied	Where the paperwork is tested against practice
Stage 5	Accreditation decision — certificate valid three years and listing on the ASNT EBC registry	Where the paperwork is tested against practice
Stage 6	Renewal through the same audit sequence; ASNT notifies at least 90 days before expiry, and some registrations carry one-year terms.	Where the paperwork is tested against practice
Renewal	Recertification is periodic and the interval is fixed by the employer's own Written Practice, not by ASNT. ASNT describes a recommended maximum interval of five years between renewals for NDT personnel. Recertification requires evidence of continued competence — re-examination or documented continuing activity — plus current vision records. Accreditation of the programme itself under the ASNT EBC route runs three years, with some registrations on one-year terms requiring annual surveillance.	Diarised from the certificate date, not the last audit

How long does SNT-TC-1A 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 American Society for Nondestructive Testing (ASNT) publishes it. Nobody enforces SNT-TC-1A directly — it becomes binding when a code, customer or regulator invokes it (ASME BPVC Section V and Section VIII, AWS D1.1, the API inspection codes, prime purchase orders). ASNT Certification Services LLC will audit and accredit a firm's programme against it through the Employer-Based Certification (EBC) Accreditation Program. 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 SNT-TC-1A findings?

Written Practice is a copy of the standard rather than a description of how the firm actually trains, examines and certifies, Examination question bank not approved by the NDT Level III, or reused without control, Certification examination administered by the candidate, or by someone the candidate supervises, On-the-job experience recorded without traceable dates, methods or supervisor attestation. 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 SNT-TC-1A 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 SNT-TC-1A 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 SNT-TC-1A 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 SNT-TC-1A audit blind typically collect findings that a sampling exercise would have caught.

What the auditor asks to see

Written Practice for the control and administration of NDT personnel training, examination and certification, approved by the employer's NDT Level III and retained on file
NDT Level III qualification records — ASNT NDT Level III certificates, or the outside-agency Level III agreement plus that person's credentials
Training records showing classroom hours per method and level against the SNT-TC-1A training table, with content traceable to ANSI/ASNT CP-105 topical outlines
Documented on-the-job experience with dates, method, and supervisor attestation
General, specific and practical examination records, graded answer sheets, and the Level III-approved examination question bank
Vision examination records — near-vision acuity and colour contrast differentiation
Individual certification and recertification records stating method, level, technique and effective dates
Evidence that outside training or examination services used by the employer were assessed against the Written Practice
Calibration records for equipment the examinations and inspections depend on (light meters, gauges, reference standards)

Findings to close before the audit

Written Practice is a copy of the standard rather than a description of how the firm actually trains, examines and certifies
Examination question bank not approved by the NDT Level III, or reused without control
Certification examination administered by the candidate, or by someone the candidate supervises
On-the-job experience recorded without traceable dates, methods or supervisor attestation
Certificates issued without stating method, technique, level and scope limits
Vision examination records expired or missing, with no mechanism that stops the technician working
Outside training provider or outside examination service used with no employer assessment against the Written Practice
Level III oversight not evidenced — auditors write the finding against the Level III as well as the technician
Firm audits itself against a different edition of SNT-TC-1A than the one its purchase order names