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An NDT level title alone does not authorize inspection work. I check three things first: the job’s required standard, the person’s certified method, and the employer’s approval.
Here’s how I separate the three certification paths:
The level describes the role - not permission to perform every task. Level I works under supervision. Level II performs inspections and evaluates results. Level III provides technical oversight, with procedure and certification authority set by the employer.
Quick Comparison
Before placement, I request training and experience records, exam results, current vision records, renewal status, and the authorized scope - not just a wallet card. ASNT NDT Level III has a five-year renewal cycle, but a current credential still does not grant site authority.
My hiring rule is simple: <u>match the person to the method, part, equipment, and required authority</u>. For radiography, I also check radiation-safety records. Recruiting can help screen candidates; the employer’s authorized technical personnel must resolve qualification gaps and approve the work.
NAS 410 vs SNT-TC-1A vs ASNT NDT Level III
Under NAS 410, the employer controls certification through its written practice. The Responsible Level 3 oversees the program. [1]
Qualification requires documented training hours for the method, logged experience hours, and three exams: general, specific, and practical. Check that the experience matches the assignment’s exact method, material, and product form - not just the level title. Personnel also need current vision examinations and must meet the recertification cycle set by the written practice. [1]
Level 1 personnel perform specified calibrations and tests under Level 2 or Level 3 supervision. They cannot independently accept or reject parts.
Level 2 personnel calibrate equipment, perform inspections, interpret results, and accept or reject parts against written criteria within their authorized scope.
Level 3 personnel oversee methods and personnel, write and approve procedures and technique sheets, and oversee personnel certification. These limits deserve close attention when a worker changes employers or methods. [1]
NAS 410 certification is employer-specific and nonportable. A new employer must reauthorize the worker under its own written practice, including any required reexamination.
Before assignment, verify the record with the certifying Level 3, especially for aerospace work subject to customer, contract, or NADCAP requirements. For radiographic testing, also verify radiation-safety training, dosimetry history, and exposure-device custody under the site license. [1]
SNT-TC-1A follows a similar employer-based model, but its written-practice controls and qualification rules differ.
SNT-TC-1A certification comes from the employer under its written practice. Like NAS 410, SNT-TC-1A is employer-controlled, but it is not limited to aerospace. The key point is who has the authority to certify. [1]
The written practice defines training, experience, vision, and exam requirements for each method. Check method hours, exam dates, current vision, and recertification status. A level title does not, by itself, establish qualification for every NDT method. [1]
Level I performs specified tests under supervision. Level II sets up equipment, performs inspections, and interprets results within the assigned scope. Level III writes procedures, approves technique sheets, and oversees certification. [1]
Certification from a previous employer does not transfer to a new employer. Before assigning work, check whether the contract requires SNT-TC-1A or NAS 410. A Level II title alone is not enough. [1] This distinction leads to ASNT-issued Level III credentials.
Unlike NAS 410 and SNT-TC-1A, ASNT NDT Level III is a personal credential, not an employer-issued certification. It can stay valid when the holder changes employers.
ASNT issues the Level III credential; it does not grant employer authorization. Applicants need Level II-equivalent NDT experience, with the required duration based on their education:
Check the applicant’s education and experience records - not just their title. [3]
Applicants must pass the NDT Basic exam and at least one method exam. Basic covers general NDT principles, while the method exam tests knowledge of the selected method in depth. Passing Basic alone does not establish method certification. [3][6]
This credential does not require a practical exam. ASNT 9712 Level III does. [4][5]
The credential can support technical authority over methods, procedures, standards interpretation, and difficult indications. But it does not, by itself, authorize site actions, such as approving procedures or certifying personnel. The employer, customer, specification, and written practice determine whether the holder may perform those duties or serve as the responsible Level III. [7][8]
An ASNT-issued certificate can stay valid across employers, but it does not replace NAS 410 certification. Check the exact credential, certified methods, certificate number, expiration date, and employer or customer acceptance. [7][8] ASNT certification follows a five-year renewal cycle. [4][9]
For aerospace work, verify method competence, required exams, vision status, and formal appointment under the employer’s NAS 410 written practice. [7][8] The next section compares authority, portability, and employer control side by side.
Match qualifications to the assignment. Technical qualification and permission to perform the work are separate checks. For hiring, look beyond the title: who can legally and contractually authorize the person to do the work?
In both employer-based programs, the employer’s written practice sets the rules for certification and work authorization.
A job title alone does not establish progression. Verify training, experience, exams, and current authorization directly with the certifying Level III, using the governing written practice.
Once you’ve checked work authority and whether qualifications transfer, match the level to the task.
These levels are parallel, not interchangeable. Each person’s duties stay within their certified method, the written practice, and the customer specification. Verify qualification first, then assign work by level and scope.
Check transfer rules when a worker changes employers or moves into aerospace. A credential that remains valid does not necessarily carry work authorization with it.
Request the underlying records - not just a wallet card. Check method-specific experience, examination results, current vision status, and the new employer’s required assessments. Use those records to verify each candidate in the hiring checklist that follows.
Use the standards above to check every candidate’s records before placement.
“ASNT Level II” is not enough.
Request the method, certification basis, issuer, dates, and authorized scope. Check who signed the certification and whether the candidate is authorized to perform tests or interpret results. [1]
After screening the résumé, check the source records with the certifying Level III. Verify training, experience, exam results, written practice, and current vision, recertification, and continuity records. Confirm any additional employer-specific assessments before assignment. [1]
Match the qualification to the exact material, part type, method, and equipment. For radiographic testing, also check radiation-safety training, dosimetry history, and exposure-device custody records. [1]
Check whether the assignment has separate customer or contract rules. Have the quality team verify the required certification basis and applicable customer, regulatory, and Nadcap requirements. Apply the same record checks to every mission-critical assignment. [1]
Keep recruiting separate from certification: iRecruit.co supports sourcing and vetting. The employer’s authorized technical personnel remain responsible for certification and resolving qualification gaps before assignment. [1][2]
Start with the assignment’s governing requirements. Confirm the applicable aerospace standard, customer requirements, and employer’s written practice. Then check the issuer, current vision status, recertification, continuity records, and authorized scope. These checks determine whether the credential can be used at this site. [1]
The credentials are not interchangeable. Before authorizing work, complete any employer re-examination required by the receiving employer’s written practice. [1]
Match the person to the method, part, and authority the job requires. Level I performs assigned tests under supervision. Level II interprets results and applies acceptance criteria. Level III provides technical oversight and may approve procedures only within the employer’s written practice. The level defines the role; employer authorization sets the limits.
Yes, prior NDT experience can count toward NAS 410 qualification, but it doesn’t transfer automatically [1]. Certification is employer-specific, so your new employer’s certifying Level III must verify your training hours and exam history [1].
You’ll typically need to retest under the employer’s written practice [1]. Hiring teams review your records to determine the level you qualify for - or whether you need to work as a trainee under supervision [1].
No. NAS 410 and ASNT-based frameworks require you to progress in sequence, completing training, documented experience hours, and examinations. You must meet the Level I and Level II prerequisites before you can qualify for Level III.
Employer-based certification depends on your documented history in specific NDT methods. At Level III, your responsibilities include approving procedures and certifying other staff.
In aerospace nondestructive testing (NDT), certification is employer-specific and follows your company’s written practice [1]. If you stop performing inspections for a period or change employers, you typically need to retake examinations or have your training, experience hours, and examinations re-verified under the applicable written practice [1]. Your certification does not automatically transfer to a new employer [1].
