AEROSPACE MATERIALS STUDY GUIDE 2026/2027
QUESTIONS AND SOLUTIONS RATED A+
✔✔Which type of NDI inspection do we have a dwell time? - ✔✔dye penetrant
✔✔What two NDI inspection types can we use fluorescent? - ✔✔dye penetrant and
magnetic particle
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Dye Penetrant - ✔✔1. dye goes on part and is then developed to find cracks
2. used on ferrous metals, nonferrous metals, nonporous plastics
3. we can ONLY find surface defects
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Eddy Current - ✔✔1. electromagnetic induction to find surface and near-surface flaws
2. can only use on electrically conductive materials
3. Surface cracks, Pits, Subsurface cracks, Corrosion on inner surfaces, Determine
alloy and heat-treat condition
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Magnetic Particle - ✔✔1. Inspection process consists of: Magnetizing the part ; Applying
ferromagnetic particles to the surface area to be inspected
2. Not applicable to nonmagnetic materials
3. Method of detecting invisible cracks and other defects on or near the surface of
ferromagnetic materials, such as iron and steel
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Ultrasonic - ✔✔1. Flaws are detected by measuring the amplitude of signals reflected
by discontinuity
2. can be used on most materials
QUESTIONS AND SOLUTIONS RATED A+
✔✔Which type of NDI inspection do we have a dwell time? - ✔✔dye penetrant
✔✔What two NDI inspection types can we use fluorescent? - ✔✔dye penetrant and
magnetic particle
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Dye Penetrant - ✔✔1. dye goes on part and is then developed to find cracks
2. used on ferrous metals, nonferrous metals, nonporous plastics
3. we can ONLY find surface defects
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Eddy Current - ✔✔1. electromagnetic induction to find surface and near-surface flaws
2. can only use on electrically conductive materials
3. Surface cracks, Pits, Subsurface cracks, Corrosion on inner surfaces, Determine
alloy and heat-treat condition
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Magnetic Particle - ✔✔1. Inspection process consists of: Magnetizing the part ; Applying
ferromagnetic particles to the surface area to be inspected
2. Not applicable to nonmagnetic materials
3. Method of detecting invisible cracks and other defects on or near the surface of
ferromagnetic materials, such as iron and steel
✔✔Basic description, what kind of materials can we use it on, and what can we find with
it:
Ultrasonic - ✔✔1. Flaws are detected by measuring the amplitude of signals reflected
by discontinuity
2. can be used on most materials
