Aircraft Structural Inspection Techniques Flashcards
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Read the first 7 Aircraft Structural Inspection Techniques flashcards as text
Which type of corrosion attacks the grain boundaries of an aluminum alloy that was improperly heat-treated?
Answer: Intergranular corrosion
Intergranular corrosion follows grain boundaries and can severely weaken the alloy with little visible surface evidence.
Filiform corrosion most commonly appears as:
Answer: Thread-like filaments beneath paint or other coatings
Filiform corrosion forms worm-like filaments under protective finishes, usually on aluminum or magnesium.
Dye penetrant inspection is capable of detecting:
Answer: Surface-breaking cracks and porosity in nonporous materials
Penetrant must enter an opening at the surface, so it only reveals surface-breaking discontinuities.
Eddy current inspection is especially well suited to finding:
Answer: Cracks around fastener holes in conductive structure
Eddy current detects surface and near-surface cracks in electrically conductive materials, such as around rivet holes.
A white to gray powdery deposit found on an aluminum skin is normally:
Answer: Aluminum corrosion product
Aluminum corrosion typically produces white or gray powdery oxide and hydroxide deposits.
Magnetic particle inspection can be used only on:
Answer: Ferromagnetic materials
The method relies on magnetic flux leakage, so the part must be ferromagnetic such as steel.
Fretting corrosion is caused by:
Answer: Slight relative motion between tightly fitted surfaces
Fretting results from small repeated movement between close-fitting parts that breaks down protective films.
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