Non-Destructive Testing (NDT) Methods Flashcards
7 cards from real ACS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Non-Destructive Testing (NDT) Methods flashcards as text
Which NDT method is most effective for detecting surface and near-surface cracks in ferromagnetic aircraft components?
Answer: Magnetic particle inspection
Magnetic particle inspection (MPI) is specifically designed for ferromagnetic materials and can reveal both surface and subsurface discontinuities by applying a magnetic field and iron particles.
What is the primary purpose of the developer in dye penetrant inspection?
Answer: To draw the trapped penetrant back to the surface to form an indication
The developer acts as a blotter, drawing the entrapped penetrant out of discontinuities to form a visible indication on the surface.
In dye penetrant inspection, what is the correct sequence of steps?
Answer: Clean → Apply penetrant → Remove excess → Apply developer → Inspect
The correct sequence is: pre-clean the surface, apply penetrant and allow dwell time, remove excess penetrant, apply developer, then inspect under appropriate lighting.
Which type of visual inspection tool is used to inspect the interior of an engine cylinder without disassembly?
Answer: Borescope
A borescope is an optical instrument with a rigid or flexible tube used to inspect the interior of inaccessible areas such as engine cylinders without requiring disassembly.
What is the minimum dwell time typically specified for dye penetrant inspection of standard discontinuities in aluminum alloy parts?
Answer: 5 to 30 minutes
For most aluminum alloy parts, penetrant dwell times typically range from 5 to 30 minutes to allow adequate capillary action into discontinuities, as specified by the applicable process specification.
Which NDT method is LEAST effective for detecting defects in non-metallic composite materials?
Answer: Magnetic particle inspection
Magnetic particle inspection requires the material to be ferromagnetic; composite materials are non-metallic and non-ferromagnetic, making MPI completely ineffective for composites.
According to FAA regulations, who may perform NDT inspections on certificated aircraft?
Answer: Only FAA-certificated airframe and powerplant mechanics with appropriate training and authorization
NDT inspections on certificated aircraft must be performed by FAA-certificated A&P mechanics who have received specific training and authorization in the applicable NDT method per the manufacturer's approved data.