Nondestructive Inspection Testing (unfinished)

What is NDI stand for?

Nondestructive inspection

What does NDT stand for?

Nondestructive testing

What is NDI?

Determines airworthiness without damaging the component

Who must interpret NDI results?

Qualified/certified personnel

What is visual inspection enhanced by? (3)

• Bright lights

• Magnifying glass

• Mirrors

When performing a visual inspection, does the lack of visible dect guarantee intergrity?

No

When inspecting a surface, how should you direct a flashlight?

4-45 degree angle

When inspecting a surface, where should you keep your eye from the light

Above the beam

How should you determine lengths of cracks?

Tracing with light at right angles

How does a borescope help visual inspections?

Allows for visual inspection in inaccessible areas

What do all aircraft turbine engine have relating to the borescope?

Borescope access ports

What does liquid penetration inspection do?

Detects surface defects in nonporous materials

What is the main limitation of liquid penetrant inspection?

Defect must be open to the surface

What are the 6 steps of liquid penetrant inspection?

1. Clean surface

2. Apply penetrant

3. Remove excess penetrant

4. Dry part

5. Apply developer

6. Inspect and interpret

What are the two different kits of liquid penetrants?

• Visible

• Fluorescent

What is a concern of overwashing when using liquid penetrant?

Removes penetrants and hide defects

How do visible penetrant appear on defects?

Red on white developer

How does fluorescent penetrant appear on defects?

Glow yellow-green under black light

What are two false indication when using liquid penetrants?

• Poor washing

• Accumulation at press-fit parts are normal and regular in form

What is an eddy current use?

Electromagnetic

What does the eddy current inspection detect? (3)

• Cracks

• Corrosion

• Alloy/heat-treat conditions

How does an eddy current work?

Creates magnetic field that induces eddy currents in conductive speciments

What does ultrasonic use to detect flaws?

Sound energy

What advantage ultrasonic has over x-ray?

Find defects too small for x-ray

What are the two methods for ultrasonic inspection?

• Immersion

• Contact

Regarding the ultrasonic immersion method, how does it work?

Both part and search unit immersed in liquid

Regarding the ultrasonic contact method, how does it work?

Uses viscous couplant between search unit and part

What are the three ultrasonic inspection methods?

• Pulse echo

• Through-transmission

• Resonance

How does the pulse echo ultrasonic inspection method work?

Measures reflected signals and timing to locate flaws

What does through- transmission ultrasonic inspection method use?

Uses two transducers

How does the resonance method in ultrasonic work?

Varies frequency to measure thickness

What are three examples of couplants?

• Grease

• Oil

• Water