SNT-TC-1A Explained for ASNT Level III Basic Exam

Why SNT‑TC‑1A Matters More Than Ever in the 2026 Exam Format?

The ASNT Level III Basic exam underwent a major redesign effective January 2026. Instead of testing isolated knowledge, the exam now evaluates whether you can manage an NDT certification program—the exact purpose of SNT‑TC‑1A.

The new competency‑based model includes domains such as:

• NDT certification program management
• Exam administration
• Personnel qualification
• Procedure approval
• Oversight of NDT operations

Every one of these domains ties directly to SNT‑TC‑1A’s structure: training, experience, examinations, certification, recertification, and written practice requirements.

If you understand SNT‑TC‑1A deeply, you understand the exam.

The 2024 Edition: What Changed and Why It Matters

The 2024 edition includes several updates that appear in exam questions. Key changes include:

• Updated definitions (e.g., Detection Rate, False Call)
• Restrictions on the use of eye drops for vision exams
• Added recommendations for digital radiography, CR, and CT interpreters
• New guidance on training exam administrators
• Recognition of ASNT 9712 as an acceptable certification reference
• Clarification on when certification and recertification periods begin

These changes are not trivial—they directly affect administrative decisions, which the exam now tests heavily.

Understanding the Purpose of SNT‑TC‑1A (2024)

SNT‑TC‑1A is a Recommended Practice, not a mandatory standard. It provides a framework for employers to build their own NDT personnel certification programs.

This means:

• Employers must create a Written Practice (Section 5.0).
• Employers may modify training, experience, and exam requirements.
• The Level III must approve the Written Practice.
• Certification is always employer‑based.

The exam expects you to apply these principles to real‑world scenarios.

The Most Tested Concept: “Should” vs. “Shall”

This is the single most important administrative concept on the Basic exam.

SNT‑TC‑1A uses “should.”

This means recommendations, not mandatory requirements.

CP‑189 uses “shall.”

This means minimum mandatory requirements.

Example exam trap:

Question:
Does SNT‑TC‑1A require Level I candidates to have a high school diploma?

Correct reasoning:
SNT‑TC‑1A uses “should,” so it is a recommendation—not a requirement—unless the employer’s Written Practice makes it mandatory.

This distinction appears in dozens of exam questions.

The Written Practice: The Heart of the Certification Program

Section 5.0 requires every employer to establish a Written Practice that defines:

• Responsibilities of each certification level
• Training requirements
• Experience requirements
• Examination requirements
• Recertification rules
• Technique‑specific requirements

The Level III must review and approve the Written Practice.

Exam Insight:

Many questions present a scenario where the Written Practice contradicts SNT‑TC‑1A.
You must choose the answer that respects the employer’s Written Practice—because SNT‑TC‑1A allows customization.

Levels of Qualification: What the Exam Wants You to Know

Section 4.0 defines the responsibilities of Level I, II, and III personnel.

Level I

• Performs specific calibrations
• Performs specific tests
• Evaluates results for acceptance/rejection only per written instructions
• Works under Level II or III supervision

Level II

• Sets up and standardizes equipment
• Interprets and evaluates results
• Understands codes and specifications
• Trains and supervises Level I and trainees
• Reports results

Level III

• Develops and approves procedures
• Interprets codes and standards
• Selects methods and techniques
• Oversees NDT operations
• Trains and examines Level I, II, and III candidates
• Has broad knowledge of all NDT methods (via Basic exam)

These responsibilities appear frequently in scenario‑based questions.

Training & Experience Requirements (Section 6.0)

The 2024 edition includes updated training and experience tables for Level I and II candidates. These tables are recommendations, not mandatory requirements.

Key points:

• Employers may modify hours in their Written Practice.
• Documented prior experience may be accepted.
• Lab hours may count toward experience in expanded academic programs (new in 2024).

Exam Trap:

If a question asks whether a candidate “meets SNT‑TC‑1A requirements,” the correct answer often depends on whether the employer’s Written Practice adopts the recommended hours or modifies them.

8. Examinations (Section 8.0): What Level III Administrators Must Know

The exam administration section is one of the most heavily tested areas.

Types of exams required:

• General
• Specific
• Practical
• Vision exams (near vision + color contrast)

Important 2024 updates:

• Personnel administering written exams must be trained and documented.
• Restrictions on using eye drops to temporarily improve vision.
• Practical exams recommended for Level II personnel who perform NDT.
• ASNT 9712 added as an acceptable reference for exam equivalency.

Exam Insight:

Expect scenario questions like:

“A candidate fails the annual vision exam but continues working. What is the certification status?”

Correct answer:
Certification is not valid until the candidate passes the vision exam again.

Certification (Section 9.0): What the Certificate Must Include

Certification is the employer’s written testimony of qualification. It must include:

• Name of employee
• Level and method
• Date of certification
• Expiration date
• Signature of the Certifying Authority
• Statement that certification is per the employer’s Written Practice

The 2024 edition clarifies when certification begins—this was added due to an interpretation request.

Exam Trap:

The Level III does not sign the certificate unless designated as the Certifying Authority.

Interrupted Service (Section 11.0)

If a certified individual does not perform a method for six months, certification is suspended until:

• The individual’s competency is re‑verified
• The Level III approves reinstatement

This is a favorite exam topic because it tests administrative judgment.

11. Recertification (Section 12.0)

SNT‑TC‑1A recommends a five‑year recertification interval.

Employers may:

• Require exams
• Require performance reviews
• Require continued satisfactory performance
• Require updated training

The exam will test whether you understand that the employer defines the recertification process, not SNT‑TC‑1A.

The “New Hire” Scenario — A Classic Exam Favorite

Scenario:
A Level II certified at Company A joins Company B.

Can Company B accept the old certification?

Correct reasoning:

• SNT‑TC‑1A is employer‑based.
• Certification from Company A is not valid at Company B.
• Company B’s Level III must:

• Review training and experience records
• Determine equivalency
• Administer exams as required by Company B’s Written Practice
• Issue a new certification under Company B

This scenario appears in nearly every Basic exam.

Qualification vs. Certification — Know the Difference

These terms are often confused:

Qualification

The process of meeting training, experience, and exam requirements.

Certification

The employer’s written statement that the individual is qualified.

The exam will test whether you can distinguish between the two in administrative decisions.

Vision Exams — Updated Rules You Must Know

The 2024 edition includes new restrictions:

• Eye drops cannot be used to temporarily improve vision for exams.
• Vision exams must be documented.
• Failure to meet vision requirements invalidates certification until corrected.

Expect at least one question on this.

How to Study SNT‑TC‑1A for the Basic Exam

Focus on:

• Definitions (Section 2.0)
• Levels of qualification (Section 4.0)
• Written Practice requirements (Section 5.0)
• Training & experience tables (Section 6.0)
• Examination rules (Section 8.0)
• Certification & recertification (Sections 9–12)

Study like a Level III administrator:

• Think about what you would do in each scenario.
• Apply the Written Practice first, SNT‑TC‑1A second.
• Remember that SNT‑TC‑1A is flexible by design.

Exam Strategy: How to Maximize Your Score

• Don’t overthink—choose the answer that aligns with the document’s literal wording.
• Flag difficult questions and return later.
• Expect scenario‑based questions that require administrative judgment.
• Remember that SNT‑TC‑1A is a guideline—flexibility is built in.
• Use the 2024 editions only; older editions will mislead you.

Final Readiness Checklist

You should be able to answer confidently:

• What is the difference between a trainee and Level I?
• Can the employer modify SNT‑TC‑1A recommendations?
• What is the difference between qualification and certification?
• What happens when a technician misses a vision exam?
• How do you handle a new hire with previous certifications?
• Who signs the certification certificate?
• What does “should” mean in SNT‑TC‑1A?
• When does certification actually begin?

If you can explain these without hesitation, you’re ready for the administrative portion of the exam.

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ASNT-SNT-TC-1A Questions for ASNT NDT Level III Basic Examination

1. A new trainee at your facility begins performing MT independently during night shift because the Level II is busy. He records results and signs the report. During an audit, this is discovered. According to SNT‑TC‑1A, what is the correct interpretation?

1. Acceptable if the trainee has 40 hours of training
2. Acceptable if the Level II reviews the report later
3. Not acceptable because trainees cannot independently conduct or report NDT
4. Acceptable if the Written Practice allows it

Correct Answer: C
Clause 4.2

“The trainee should not independently conduct, interpret, evaluate, or report the results of any NDT.”

2. A Level II UT technician certified at Company A joins Company B. He presents his certificates and requests immediate authorization to perform UT. What must Company B do?

1. Accept the certification automatically
2. Require only a vision exam
3. Review training/experience and certify per Company B’s Written Practice
4. Allow him to work under supervision without certification

Correct Answer: C
Clause 6.1

“Documentation of prior certification may be used… as evidence of qualification for comparable levels of certification.”

3. Your company updates its Written Practice. Who must approve the revised document before it becomes valid?

1. HR Manager
2. Any Level II
3. Employer’s NDT Level III
4. ASNT Headquarters

Correct Answer: C
Clause 5.5

“The employer’s written practice shall be reviewed and approved by the employer’s NDT Level III.”

4. A Level I PT technician fails to complete his annual near‑vision exam but continues performing PT for two months. What is the certification status?

1. Still valid because PT is visual
2. Suspended until vision is re‑verified
3. Valid if supervisor approves
4. Automatically revoked permanently

Correct Answer: B
Clause 8.2.1

“This should be administered annually.”

5. A technician uses eye drops to temporarily improve near‑vision acuity before the annual exam. What does SNT‑TC‑1A state?

1. Allowed if documented
2. Allowed for Level I only
3. Prohibited
4. Allowed if employer approves

Correct Answer: C
Clause 8.2.1.1

“Pharmacological agents… shall not be used.”

6. A Level I MT technician is asked to interpret indications and determine acceptance criteria because the Level II is absent. Is this acceptable?

1. Yes, if trained
2. Yes, if the Written Practice allows
3. No, Level I cannot interpret results
4. Yes, if supervised remotely

Correct Answer: C
Clause 4.3.1

“Qualified to… perform specific evaluations for acceptance or rejection determinations according to written instructions.”

7. A Level II ET technician refuses to train a trainee, stating it is not his responsibility. What does SNT‑TC‑1A say?

1. He is correct
2. Training is optional
3. Level II must provide on‑the‑job training
4. Only Level III trains trainees

Correct Answer: C
Clause 4.3.2

“Should exercise assigned responsibility for on‑the‑job training and guidance of trainees and NDT Level I personnel.”

8. A dispute arises about which UT technique should be used for a new weld configuration. Who has the authority to designate the technique?

1. Level I
2. Level II
3. Level III
4. QA Manager

Correct Answer: C
Clause 4.3.3

“Capable of… designating the particular NDT methods, techniques, and procedures to be used.”

9. A Level II administers a written exam to a candidate who reports directly to him. Is this allowed?

1. Yes
2. Yes, if monitored by HR
3. No, exams cannot be administered by a subordinate
4. Yes, if the Level III approves

Correct Answer: C
Clause 8.1.8

“In no case shall an examination be administered by oneself or by a subordinate.”

10. A candidate’s practical exam includes only unflawed specimens. Is this acceptable?

1. Yes
2. Yes, if Written Practice allows
3. No, at least one flawed specimen is required
4. Yes, if Level III signs off

Correct Answer: C
Clause 8.5.2

“At least one flawed specimen… should be tested.”

11. A candidate passes all exams on March 1, but the Certifying Authority signs the certificate on March 15. When does certification begin?

1. March 1
2. March 15
3. Date chosen by Level III
4. Date of first NDT performed

Correct Answer: B
Clause 9.5.2

“The date of certification should be the date the Certifying Authority signs the certification document.”

12. If certification begins on March 15, 2026, when does it expire?

1. March 15, 2028
2. March 15, 2031
3. March 15, 2030
4. Five years from exam date

Correct Answer: C
Clause 9.5.3

“The date of expiration should be five (5) years from the date established in paragraph 9.5.2.”

13. A Level II resigns from the company. What happens to his certification?

1. Remains valid
2. Transfers automatically
3. Revoked
4. Suspended

Correct Answer: C
Clause 13.1

“The employer’s certification shall be deemed revoked when employment is terminated.”

14. A Level II MT technician has not performed MT for 7 months. What must occur?

1. Nothing
2. Certification is suspended until competency is re‑verified
3. Automatic recertification
4. Only a vision exam is needed

Correct Answer: B
Clause 11.1

“Written practice should include rules covering… interrupted service that requires reexamination and recertification.”

15. A candidate has 200 hours of UT experience but the Written Practice requires 210 hours. What applies?

1. SNT‑TC‑1A overrides the Written Practice
2. Candidate is qualified
3. Candidate must meet the Written Practice requirement
4. Level III may waive hours without documentation

Correct Answer: C
Clause 5.1–5.3

“The employer shall establish a written practice… [that] should describe the training, experience, and examination requirements.”

16. Your company hires an outside Level III to administer exams. What must be documented?

1. His salary
2. His ASNT membership
3. Employer’s acceptance of the outside supplier
4. His travel history

Correct Answer: C
Clause 8.1.7

“A recommendation was added to document acceptance of an outside supplier for examination services.”

17. A Level I UT candidate receives a General exam with 20 questions. Is this acceptable?

1. Yes
2. No, minimum is 40
3. Yes, if Level III approves
4. Yes, if combined with Specific exam

Correct Answer: B
Table 8.3.3

“Ultrasonic Testing… Level I General: 40.”

18. During a practical exam, a candidate marks an acceptable indication as a defect. What is this called?

1. Missed call
2. False call
3. Detection error
4. Interpretation error

Correct Answer: B
Clause 2.1.11

“When an acceptable indication… is identified as being a defect.”

19. A candidate detects 8 flaws out of 10 in a specimen. What is this measurement called?

1. Accuracy rate
2. Detection rate
3. Probability of detection
4. Sensitivity

Correct Answer: B
Clause 2.1.7

“Detection Rate… represents the number of flaws… detected… compared to the number… actually in the specimen.”

20. Your company performs only PT and MT. Must the Written Practice include UT requirements?

1. Yes
2. No, only methods used by the employer
3. Yes, for future expansion
4. Yes, if ASNT recommends

Correct Answer: B
Clause 5.4

“The employer’s written practice should identify the test techniques within each test method applicable to its scope of operations.”

Multiple‑Choice Questions Based on SNT‑TC‑1A (2024)

21. Which activity is permitted for a Trainee?

1. Independently interpret NDT results
2. Independently conduct NDT
3. Work only with a certified individual and not independently evaluate results
4. Sign NDT reports after Level II review

Correct Answer: C
Clause 4.2

“The trainee should not independently conduct, interpret, evaluate, or report the results of any NDT.”

22. What is the definition of Certification?

1. Demonstrated skill and knowledge
2. Written testimony of qualification
3. Documented training and experience
4. Employer‑approved training program

Correct Answer: B
Clause 2.1.2

“Certification: written testimony of qualification.”

23. Who is responsible for certification of NDT personnel?

1. ASNT
2. Outside Agency
3. Employer
4. Level III only

Correct Answer: C
Clause 9.1

“Certification of NDT personnel… is the responsibility of the employer.”

24. Who must approve the employer’s Written Practice?

1. HR Manager
2. ASNT
3. Employer’s NDT Level III
4. Certifying Authority

Correct Answer: C
Clause 5.5

“The employer’s written practice shall be reviewed and approved by the employer’s NDT Level III.”

25. How often must near‑vision acuity be examined?

1. Every 5 years
2. Every 2 years
3. Annually
4. Only at initial certification

Correct Answer: C
Clause 8.2.1

“This should be administered annually.”

26. Which statement is correct regarding eye drops?

1. Allowed if documented
2. Allowed for Level I only
3. Prohibited for improving visual acuity
4. Allowed if employer approves

Correct Answer: C
Clause 8.2.1.1

“Pharmacological agents… shall not be used.”

27. What is a False Call?

1. Missed flaw
2. Acceptable indication identified as a defect
3. Incorrect calibration
4. Incorrect technique selection

Correct Answer: B
Clause 2.1.11

“When an acceptable indication… is identified as being a defect.”

28. Which is a Level I responsibility?

1. Approve procedures
2. Interpret results independently
3. Perform specific NDT per written instructions
4. Train Level II personnel

Correct Answer: C
Clause 4.3.1

“Qualified to properly perform specific standardizations, specific NDT… according to written instructions.”

29. Which is a Level II responsibility?

1. Approve NDT techniques
2. Set up and standardize equipment
3. Develop procedures
4. Certify personnel

Correct Answer: B
Clause 4.3.2

“Qualified to set up and standardize equipment…”

30. Which is a Level III responsibility?

1. Perform NDT only
2. Interpret results only
3. Develop, qualify, and approve procedures
4. Conduct only practical exams

Correct Answer: C
Clause 4.3.3

“Capable of developing, qualifying, and approving procedures…”

31. What is the minimum composite passing grade for qualification exams?

1. 70%
2. 75%
3. 80%
4. 85%

Correct Answer: C
Clause 8.1.5

“Passing composite grade of at least 80%…”

32. What is the minimum passing grade for the Practical exam?

1. 60%
2. 70%
3. 75%
4. 80%

Correct Answer: D
Clause 8.1.5

“The Practical examination should have a passing grade of at least 80%.”

33. Who is prohibited from administering an exam?

1. Level III
2. Qualified representative
3. Outside agency
4. Oneself or a subordinate

Correct Answer: D
Clause 8.1.8

“In no case shall an examination be administered by oneself or by a subordinate.”

34. When does certification expire?

1. 3 years from certification
2. 5 years from certification date
3. 5 years from date Certifying Authority signs
4. At employer discretion

Correct Answer: C
Clause 9.5.3

“The date of expiration should be five (5) years from the date established in paragraph 9.5.2.”

35. When is certification revoked?

1. When exams expire
2. When training lapses
3. When employment is terminated
4. When Level III changes employer

Correct Answer: C
Clause 13.1

“The employer’s certification shall be deemed revoked when employment is terminated.”

36. What must the Written Practice include regarding interrupted service?

1. Salary adjustments
2. Rules for reexamination and recertification
3. Mandatory retraining hours
4. Automatic suspension

Correct Answer: B
Clause 11.1

“Written practice should include rules covering… interrupted service that requires reexamination and recertification.”

37. What is the recommended maximum recertification interval?

1. 3 years
2. 4 years
3. 5 years
4. 10 years

Correct Answer: C
Clause 12.2

“Recommended maximum recertification interval is five (5) years…”

38. Which record must be maintained?

1. Employee salary
2. Vision exam results
3. Personal medical history
4. Travel logs

Correct Answer: B
Clause 9.4.5

“Results of the vision examinations… should be maintained.”

39. What must the Practical exam include?

1. Only unflawed specimens
2. At least one flawed specimen
3. Only digital samples
4. Employer‑selected written questions

Correct Answer: B
Clause 8.5.2

“At least one flawed specimen… should be tested.”

40. How many General exam questions are required for Level I UT?

1. 20
2. 30
3. 40
4. 50

Correct Answer: C
Table 8.3.3

“Ultrasonic Testing… Level I General: 40.”

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