3.1 Level III Duties & the Written Practice

The Level III as the Program's Technical Authority

An ASNT NDT Level III (nondestructive testing, Level III) is the senior technical authority for an employer's NDT program. A Level I performs setups, runs equipment to instructions, and records data; a Level II calibrates equipment, interprets and evaluates indications, and reports results against an approved procedure. The Level III owns the framework those lower levels operate inside. On the Basic exam, roughly one task in six sits in the Certification & Qualification area, and a large share of those items ask what the Level III is responsible for versus what belongs to production, purchasing, engineering, or quality assurance. Getting that boundary right is the most reliable way to answer duty questions correctly.

The Five Core Duties

The recommended-practice documents converge on the same duty set. A useful memory hook is approve, select, examine, train, interpret:

Notice what is not on this list. A Level III does not schedule production shifts, issue purchase orders, unilaterally authorize repair welds without engineering input, or release nonconforming product for shipment. Exam writers plant those items as distractors. Whenever an option pushes the Level III outside the technical direction of the NDT program, it is almost always the wrong choice.

The Written Practice: the Governing Document

The written practice is the employer's internal document that describes how it qualifies and certifies its own NDT personnel. It is the controlling authority for day-to-day certification decisions, and it is the first thing an auditor asks to see. A written practice normally defines, for each certification level, the certification method, the education and work-experience minimums, required training, the examination structure and passing rules, near-vision and color-vision requirements, expiration and recertification intervals, and the records that must be kept. When a contract invokes a mandatory standard such as ANSI/ASNT CP-189, the written practice must at least meet that standard's minimums; the employer may make its practice more restrictive but may not relax a mandatory provision to fit a schedule.

Because the written practice governs, a Level III cannot lawfully certify a candidate who has passed the exams but has not met the documented experience, training, or vision requirements. Passing the test is only one qualification element. A common trap answer offers a "temporary" or "conditional" certification to solve a staffing shortage; the defensible action is to withhold certification until every requirement in the written practice is satisfied and recorded.

Qualification Versus Certification

These two terms are tested repeatedly and are easy to confuse. Qualification is the demonstrated combination of training, experience, examination results, and vision that shows a person is prepared to perform specific NDT duties. Certification is the employer's formal, signed written attestation that the individual has satisfied the written practice and may perform those duties. A candidate can be qualified in substance yet not certified until the paperwork is completed and signed; conversely, a certificate is only valid if the underlying qualification elements genuinely exist.

Delegation Limits

Many employers, especially small shops, hire an outside (contract) Level III to write procedures, develop and administer examinations, and provide technical direction. This is permitted, but it does not transfer ownership of the program. The employer always retains responsibility for its certification program, for issuing certifications in accordance with its written practice, and for maintaining the records. A contract Level III supports technical functions; the employer signs and defends the certifications. On the exam, if a question asks who is responsible for certifying personnel when an outside Level III runs the exams, the answer is the employer.

The delegation principle extends downward as well. A Level III may delegate proctoring, data collection, or routine calibration checks to qualified personnel, but the responsibility for procedure approval, method selection, and the final competency judgment cannot be handed to a Level II. Keeping these lines clear is the essence of the Level III role: authorize and oversee, rather than personally perform every task.

The Authority Ladder in Practice

A worked scenario ties the levels together. Suppose a shop must ultrasonically examine a new batch of forgings. The Level III interprets the customer specification, selects the technique, and writes and approves the procedure and its technique sheet. A Level II then calibrates the instrument to that procedure, scans the parts, interprets the indications, evaluates them against the stated acceptance criteria, and issues the report. A Level I may set up the workstation, apply couplant, and record readings under supervision, but does not interpret or accept. If a borderline indication cannot be resolved within the procedure, it escalates back up to the Level III, who may revise the technique or seek engineering direction. This upward escalation, never a downward hand-off of judgment, is the pattern the exam rewards.

Recertification and the Written Practice

A certification is not permanent. The written practice sets recertification intervals for each level, and the Level III is responsible for tracking expiration dates, arranging any required reexamination, and confirming continuity of work before renewal. Because the written practice is the document that fixes these intervals, vision-retest periods, and record rules, the Level III must also drive its periodic review so it never falls out of step with the standards it invokes or with how the shop actually operates.