ACS Non-Destructive Testing (NDT) Methods 3

Question 1

What type of radiation is used in radiographic inspection of aircraft structural components?

Accepted Answer

X-rays or gamma rays

Answer

Ultraviolet (UV) radiation

Answer

Infrared (IR) radiation

Answer

Radio frequency (RF) radiation

Question 2

On a radiographic film, a darker area (higher film density) typically indicates what about the inspected material?

Accepted Answer

A void, crack, or area of reduced material density allowing more radiation to pass through

Answer

Greater material thickness or higher density in that area

Answer

A surface contaminant blocking radiation

Answer

Correct exposure with no defects present

Question 3

What is the purpose of a penetrameter (Image Quality Indicator, IQI) in radiographic testing?

Accepted Answer

To verify that the radiograph has sufficient sensitivity and quality to detect a defined minimum flaw size

Answer

To measure the total radiation dose received by the technician

Answer

To calibrate the X-ray machine voltage and current settings

Answer

To remove scattered radiation artifacts from the film

Question 4

Which NDT method is most appropriate for detecting delaminations in a carbon fiber reinforced polymer (CFRP) aircraft panel?

Accepted Answer

Ultrasonic testing (pulse-echo or through-transmission)

Answer

Magnetic particle inspection

Answer

Dye penetrant inspection

Answer

Eddy current surface probe testing

Question 5

What is the primary radiation safety concern for technicians performing X-ray radiographic inspection?

Accepted Answer

Cumulative exposure to ionizing radiation increasing the risk of biological harm

Answer

Ultraviolet skin burns from the X-ray tube housing

Answer

Chemical burns from radiographic film developer solutions

Answer

Hearing damage from high-frequency radiation noise

Question 6

What does a bright fluorescent indication under UV (black) light during fluorescent penetrant inspection (FPI) indicate?

Accepted Answer

Penetrant has been drawn out of a surface-opening discontinuity, indicating a crack or porosity

Answer

The developer has not yet reacted with the penetrant

Answer

The part surface was over-cleaned, removing all penetrant

Answer

Background fluorescence from the developer material only

Question 7

According to FAA AC 43.13-1B, which statement about NDT method selection is correct?

Accepted Answer

The NDT method used must be specified in the manufacturer's maintenance manual or approved equivalent data for that inspection

Answer

Any NDT method may be substituted for another without engineering approval if the inspector has been trained in both

Answer

Visual inspection alone is sufficient for all primary structural inspections if performed by a certificated A&P mechanic

Answer

NDT is only required on powerplant components, not airframe structures