ACS Non-Destructive Testing (NDT) Methods

Question 1

Which NDT method is most effective for detecting surface and near-surface cracks in ferromagnetic aircraft components?

Accepted Answer

Magnetic particle inspection

Answer

Ultrasonic testing

Answer

Dye penetrant inspection

Answer

Eddy current testing

Question 2

What is the primary purpose of the developer in dye penetrant inspection?

Accepted Answer

To draw the trapped penetrant back to the surface to form an indication

Answer

To clean the surface before penetrant application

Answer

To increase the viscosity of the penetrant

Answer

To remove excess penetrant from the surface

Question 3

In dye penetrant inspection, what is the correct sequence of steps?

Accepted Answer

Clean → Apply penetrant → Remove excess → Apply developer → Inspect

Answer

Clean → Apply developer → Apply penetrant → Inspect

Answer

Apply penetrant → Clean → Apply developer → Inspect

Answer

Apply developer → Apply penetrant → Clean → Inspect

Question 4

Which type of visual inspection tool is used to inspect the interior of an engine cylinder without disassembly?

Accepted Answer

Borescope

Answer

Micrometer

Answer

Dial indicator

Answer

Feeler gauge

Question 5

What is the minimum dwell time typically specified for dye penetrant inspection of standard discontinuities in aluminum alloy parts?

Accepted Answer

5 to 30 minutes

Answer

30 seconds

Answer

1 minute

Answer

1 to 2 hours

Question 6

Which NDT method is LEAST effective for detecting defects in non-metallic composite materials?

Accepted Answer

Magnetic particle inspection

Answer

Ultrasonic testing

Answer

Radiographic inspection

Answer

Thermographic inspection

Question 7

According to FAA regulations, who may perform NDT inspections on certificated aircraft?

Accepted Answer

Only FAA-certificated airframe and powerplant mechanics with appropriate training and authorization

Answer

Any FAA-certificated pilot with instrument rating

Answer

Any person supervised by a licensed mechanic

Answer

Only FAA inspectors