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  Personnel Certification Program


The American Society for Nondestructive Testing (ASNT) Recommended Practice No. SNT-TC-1A is an "In -house" employer based training, qualification and certification programs.
This document established levels of qualification based upon a combination of education, training, experience, and qualification examinations. The basic levels begin with NDT Level I primarily used as an operator technician. NDT Level II, the next level requires more training and experience, but permits more independent activity including accepting and rejecting test objects. The NDT Level III requires experience comparable to an NDT Level II. The number of years depends upon the candidate's formal education.

Employer's Written Practice
SNT-TC-1A requires an internal company procedure that details how employees are trained, qualified and certified to perform NDT functions for the company.
The Written Practice should provide descriptions of:

  Applicable NDT methods used such as Laser Shearography (LR), Radiography (RT) , Ultrasonic (UT) etc.

  Levels of personnel qualification.
LEVEL I - qualified to perform specific calibrations, specific examinations and specific evaluations (with specific written instructions).
LEVEL II - qualified to set-up and calibrate equipment and to interpret and evaluate results with respect to codes, standards, and specifications. Must be able to prepare written instructions, qualified to provide on-the-job training and guidance of trainees and report examination results.
LEVEL III - must be capable and responsible for establishing techniques, interpreting codes, and designating the test method and technique to be used, and capable of training and examining NDT Level I and II personnel for certification. Must have a practical background in the technology and be familiar with other commonly used methods of NDT.

  Certification / re-certification requirements and interruption intervals. Typically, Level I and Level II personnel are recertified at three (3) year intervals and Level III personnel are recertified at five (5) year intervals; however, interruption intervals of inactivity for suspension of certification should be addressed.

Personnel should achieve the minimum experience level recommended which will vary for each particular NDT method. This initial experience may be in recorded in months or hours. This option should be determined by the employer and described in the employer's written practice.

Qualification Examination

NDT Level I/II examinations include:

  An eye exam for near vision acuity and color contrast discrimination.

  A written "General" examination to demonstrate the candidate's knowledge of the basic principles and fundamentals of the method.

  An evaluation of practical work performance is provided by a "Practical Test" portion.


Certification is a written statement of qualification. Using employer-based programs such as SNT-TC-1A requires employer certification.

National Aerospace Standard, NAS 410

For many years, aerospace and defense related military or government contracts required NDT personnel qualifications in accordance with MIL-STD-410E. It was replaced in the 1990's by NAS 410.

Many companies are currently using the January, 1996 revision 1; however, Revision 2 was published in February, 2003. Revision 2 changed the re-certification period for Level I and II from 3 years to 5 years.


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