What is Ultrasonic TOFD?

Time of Flight Diffraction is an Ultrasonic technique developed originally to improve the sizing accuracy of flaws previously detected by other means. Early applications of the technique advanced from solely sizing flaws to applications relying on TOFD for principle detection means, this pioneering technology resulted in major flaws being missed due to poor application and a general lack of understanding by persons operating the equipment.

What are the responsibilities of a individual who is certified to Ultrasonic TOFD Level 3?

An individual certified to Level 3 has demonstrated;

  • The competence to evaluate and interpret results in terms of existing standards, codes, and specifications;
  • Sufficient practical knowledge of applicable materials, fabrication, process, and product technology to select NDT methods, establish NDT techniques, and assist in establishing acceptance criteria where none are otherwise available;
  • A general familiarity with other NDT methods

Within the scope of the competence defined on the certificate, Level 3 personnel may be authorised to:

  • Assume full responsibility for a test facility or examination centre and staff;
  • Establish, review for editorial and technical correctness and validate NDT instructions and procedures;
  • Interpret codes, standards, specifications and procedures;
  • Designate the particular test methods, techniques and procedures to be used;
  • Within the scope and limitations of any certification held, carry out all tasks at all levels;
  • Provide guidance for NDT personnel at all levels.

Level 3 certificated personnel may be authorised to carry out, manage and supervise PCN qualification examinations on behalf of the British Institute of NDT.

Where Level 3 duties require the individual to apply routine NDT by a method or methods within a particular product or industry sector, the British Institute of NDT strongly recommends that industry demand that this person should hold and maintain Level 2 certification in the applicable method(s) and sector(s).

The range and scope of PCN certification available at each level is defined in the relevant appendix to these general requirements.

Ultrasonic TOFD Level 3 training at Lavender International follows the training syllabus detailed in CP 105 and EN 25017 where applicable.

Some schemes do not have specific training hour requirements for Level 3 training and some do, Lavender International has put together a series of Level 3 training programmes which have shown over years of experience to meet the needs of the industry. We use the most recent resources including Study Guides, Handbooks, Question and Answers from ASNT and BINDT.

Lavender International follows the BS EN ISO (PCN) 9712 – NDT Qualification and Certification of NDT Personnel Standard for its Level 3 programmes.

All candidates must pass the Basic exam first, which remains valid for 5 years, which includes:

A) Product Technology
B) PCN General Requirements Document
C) 4 Methods – General Theory – 15 multiple choice questions on each
(note there must be a volumetric method)

Then you take the Method Exam

D) General Theory
E) Specific Training
F) Procedure Writing

Methods available for Level 3 exams – MT, PT, VT, UTW, UTC, UTWP, UTPA, UTTOFD, RTC, RTW, ETWP, ET Welds.

Employer-based schemes

B) EN 4179 – NAS 410

The Company Written Practice is followed by Lavender International to conduct the Level 3 exam as specified in the document with the approval of the Employer.

ASNT NDT Level 3

Lavender International cannot provide ASNT NDT Level 3 exams but can provide advice on the exam and training in preparation for the exam and contact information for exam locations in the UK and worldwide.

To progress from Level 2 to Level 3 requires a minimum amount of time spent as a Level 2. However, the time required varies from scheme to scheme and you are advised to review the appropriate scheme document when considering becoming a Level 3.

Further advice can be provided by contacting us at Lavender International.

Ultrasonic TOFD Level 3 courses take place around the world at Lavender international.


UK office – Penistone USA office – Houston, Texas On-site locations
Click here for available dates Click here for available dates Contact us


UK office – Penistone USA office – Houston, Texas
Weekly Contact us

If you would like further information about this course, please contact us.


If you are interested in receiving a proposal for Level 3 preparation, you are invited to fill out this entry form, please attach your NDT CV, NDT Certificates and details of your Level 3 aims below.

A member of staff will contact you with a proposal.

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Please attach NDT CV, NDT Certificates and any supporting information.

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