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Aircraft NDT

Aircraft Maintenance NDT Principles

QuestionAnswer
Which NDI method is considered quick, reliable, small level of skill, and inexpensive for detecting surface defects Dye Penetrant Inspection
This method cannot be used on materials with rough surfaces or highly absorbent such as rubber, plastics, or some synthetic materials Dye Penetrant Inspection
What are the two types of penetrant materials for dye penetrant inspection visible dye and fluorescent dye
After penetrant is applied it is set aside to drain, this is known as the... penetration time or dwell time
During a dye penetrant process, poor cleaning, poor developer removal , or press-fit parts generally result in... False Indications
A form of NDI that can detect flaws on the surface or just below the surface of alloys composed of iron or steel. Magnetic Particle Inspection
Iron, steel, cobalt, nickel and their alloys are considered ________ materials allowing them to be affected by magnetic particle inspection. Ferromagnetic
The ease with which a part can be magnetized permeability
What are the two methods of magnetic particle inspection circular and longitudinal magnetization
Proper orientation is critical to reveal defects, therefore, how should the magnetic field situated relative to a crack Right angles are best
Two methos used to perform circular magnetization direct contact or direct induction and indirect or central conductor methods
What is longitudinal magnetization used for? circumferential discontinuities 45 to 90 degrees from the axis
What is used to create longitudinal magnetization? Coil shot
What is used to create circular magnetization Head shot
Which current (AC or DC) is most able to detect subsurface discontinuities AC
Which magnetic particle inspection method uses magnetizing force that is active when the indicating method is applied. continuous magnetization method
How can magnetic particles be applied Wet or Dry
What are the methods of applying a penetrant for inspection? Spraying, immersion, brushing
Which method of nondestructive testing uses sound waves? Ultrasonic
Radiographic inspection can cause... Genetic Mutations
A part which is being prepared for dye penetrant inspection should be cleaned with... A volatile petroleum base solvent
What method of magnetic particle inspection is used most often to inspect aircraft parts for invisible cracks and other defects? Continuous
Which nondestructive testing method is suitable for inspecting most metals, plastics, and ceramics for surface and subsurface defects? Ultrasonic
The pattern for an inclusion in a magnetic particle inspection causes... Parallel lines
The testing medium that is generally used in magnetic particle inspection utilizes a ferromagnetic material that has... High permeability and low retentivity
Which type of magnetization may be used with steels that have been heat treated for stress applications? Residual
A mechanic has completed a bonded honeycomb repair using the potted compound repair technique. What NDT method is used to determine the soundness of the repair? Metallic ring test
What are the two types of indicating mediums available for magnetic particle inspection Wet and dry process materials
What is one way a part may be demagnetized after magnetic particle inspection? Slowly moving the part out of an AC magnetic field of sufficient strength
To detect a minute crack using dye penetrant inspection usually requires... A longer-than-normal penetrating time
Disadvantages : Detects only surface breaking defects. Surface preparation is critical as contaminants can mask defects. Requires a relatively smooth and nonporous surface. Dye Penetrant
Disadvantages: Surface must be accessible to probe and couplant. Skill and training required is more extensive than other technique. Surface finish and roughness can interfere with inspection. Ultrasonic
Disadvantages Only ferromagnetic materials can be inspected. Proper alignment of magnetic field and defect is critical. Large currents are needed for very large parts. Magnetic Particle Testing
Disadvantages:Only conductive materials can be inspected. Ferromagnetic materials require special treatment to address magnetic permeability. Depth of penetration is limited. Eddy Current Testing
Disadvantages: Extensive operator training and skill required. Access to both sides of the structure is usually required. Orientation of the radiation beam to non-volumetric defects is critical. Radiographic Testing
Advantages: Large surface areas or large volumes of parts can be inspected rapidly at low cost. Parts with complex geometry routinely inspected. Indications produced directly on surface of part providing a visual image of the discontinuity. Dye Penetrant Testing
Advantages: Large surface areas of complex parts can be inspected rapidly. Can detect surface and subsurface flaws. Surface preparation is less critical than it is in penetrant inspection. Magnetic Particle Testing
Advantages: Depth of penetration for flaw detection or measurement is superior to other methods. Only single sided access is required. Provides distance information. Minimum part preparation is required. Ultrasonic Testing
Advantages: Detects surface and near surface defects. Test probe does not need to contact the part. Method can be used for more than flaw detection. Eddy Current Testing
Advantages: Can be used to inspect virtually all materials. Detects surface and subsurface defects. Ability to inspect complex shapes and multi-layered structures without disassembly. Minimum part preparation is required. Radiographic
Created by: bgilbert