2.3 Level I/II/III Responsibilities, Eligibility & Recertification

The Three Levels: Duties, Eligibility, Examinations, and Recertification

Every certification scheme in this chapter shares the same three-tier ladder — Level I, Level II, and Level III — plus an uncertified trainee who works only under direct supervision. A Level III must be able to state each level's authority, the education-and-experience trade-off that governs eligibility, the examinations required, and the recertification cycle.

Duties by level

A Level I performs specific calibrations, specific tests, and specific evaluations for acceptance or rejection according to written instructions, and records the results. A Level I does not independently set acceptance criteria; it applies criteria that a Level II or III has already established. A Level II sets up and calibrates equipment, interprets and evaluates results against codes, standards, and specifications, prepares written instructions for Level I, and organizes and reports results. A Level III is responsible for the NDT operation: developing, qualifying, and approving procedures; interpreting codes, standards, and specifications; designating the method and technique for a job; and training and examining Level I and II personnel. The Level III is also expected to have general familiarity with related methods and with the materials and processes being inspected.

Eligibility — the education/experience trade-off

Eligibility scales education against experience: the more relevant education a candidate holds, the fewer documented work-experience hours are required, and vice versa. For the ASNT NDT Level III path, ASNT's public guidance sets the endpoints of that trade-off.

At the Level I and II tiers under SNT-TC-1A, requirements are method-specific and much smaller, expressed in training hours and experience hours per method (for example, penetrant testing requires only a few training hours at Level I, while ultrasonic and radiographic testing require far more). Experience is accumulated in the method, not merely elapsed calendar time, and each method is counted separately.

Examinations required

Under SNT-TC-1A and CP-189, Level I and II candidates take a general examination (basic principles), a specific examination (the employer's equipment, procedures, and techniques), and a practical examination (a hands-on demonstration plus specimen interpretation). The ASNT NDT Level III credential is earned by passing the Basic examination (135 questions, 4 hours) plus at least one method examination (90 or 135 questions, in 2 or 4 hours). ASNT states that no practical examination is required for the ASNT NDT Level III path. A current vision examination — near-vision acuity plus color/contrast discrimination — is required at every level and is repeated annually.

Recertification and interrupted service

Employer-based programs (SNT-TC-1A, CP-189, NAS 410) recommend or require recertification at intervals not exceeding five years, achieved through evidence of continued satisfactory performance or re-examination, with the annual vision check maintained throughout. The ASNT NDT Level III certificate is valid for five years and is renewed through a recertification-credit process or re-examination. Under ISO 9712, certification is valid for five years, renewed at five years on documentation of continued activity and vision, with fuller recertification at ten years by examination or a structured credit system. Interrupted service — a significant gap in performing a method — can trigger additional training or re-examination as defined by the governing document, which is exactly why a Level III must keep continuity records under control.

A common trap

Do not confuse qualification with certification. Qualification is the combination of training, experience, examinations, and vision that shows a person is prepared; certification is the employer's formal written statement that the individual satisfied the written practice. A candidate who has the training hours and experience but has not passed the required examinations is not yet qualified, so certification cannot be issued — regardless of schedule pressure.

Method-by-method certification

Certification is always method-specific: a technician certified as a Level II in magnetic particle testing has no authority in radiographic testing until separately qualified and certified in that method. A Level III may hold certification in several methods, each earned through its own examinations and experience. When recertifying by the credit or points route rather than by re-examination, the individual documents continuing activity — inspections performed, procedures written, training delivered, and technical study — so the file demonstrates that competence has been maintained across the full five-year cycle rather than merely assumed.