FAA Powerplant Written Practice Test

Which of the following statements is true regarding structural inspection of engine parts during an overhaul?

1. Dye penetrant can be used on all metals

2. Resonance ultrasound inspection is primarily used for color detection

3. X-rays can only be used on aluminum components

4. X-rays can be used to check the structural integrity of engine components

The correct answer is: X-rays can be used to check the structural integrity of engine components

The correct statement is that X-rays can be used to check the structural integrity of engine components. X-ray inspection, also known as radiography, is a non-destructive testing method that uses X-ray radiation to penetrate materials and produce images of the internal structure. This technique is particularly useful for detecting internal cracks, voids, and other discontinuities that may compromise the integrity of engine components, making it a valuable tool during an overhaul. It is applicable to a range of materials, including metals such as aluminum, steel, and titanium, allowing for comprehensive evaluation of components made from various materials. Dye penetrant is a useful technique for detecting surface cracks and discontinuities, but its application is limited to non-porous materials and is not suitable for all metals, which is why the first statement does not hold true. Resonance ultrasound inspection focuses on material characterization and can provide information about mechanical properties but is not primarily used for color detection, making that statement inaccurate as well. The assertion that X-rays can only be used on aluminum components is incorrect, as X-ray inspection is versatile and applicable to many different materials, not solely aluminum.