Flashcards in Boroscope Deck (20):
What is a visual inspection?
A visual inspection is the most common form of NDT and it consists of viewing the area using the eyes aided with other instruments.
List five things looked for during a pre-flight inspection.
Cracks, Corrosion, Leaks, Missing part and Foreign Object Damage
List five tools used during a walkaround inspection
Five tools used during a walkaround are eyes, flashlights, inspection mirror, magnifying glasses, borescope or fiberscope.
What is FOD?
FOD, also known as Foreign Object Damage, is damage caused by outside objects such as birds, tools, hardware, and debris.
What is the purpose of a borescope inspection?
The purpose of a borescope inspection is to visually inspect an area inside that is impossible to see.
What are the three classifications of borescopes used?
The three classifications of borescopes used are video, rigid, and flexible.
What is the recommended technique for detecting cracks?
The recommended technique for detecting cracks is a 4-45 degree angle off the surface of the area being inspected.
Who can perform a preflight inspection?
Pilots, mechanics, crew members, and the FAA can perform a preflight inspection.
What type of magnifying glass is recommended for crack detection ?
A 5- 10X magnifying glass is recommended for crack detection
If an area is suspected of damage what should be done to the area to thoroughly inspect it for damage?
The area should be cleaned. Remove any contaminants however do not remove the finish.
List five areas on an aircraft that are susceptible to damage? Why?
Fuselage- bird strikes, lightning strikes
Landing Gear- for condition and security of attachment, tire wear and cuts Engine Section- source of leakage
Propeller- nicks, bends, dents, cracks
Empennage- defects, distortion, stress
List four advantages of a visual inspection.
Inexpensive, Highly portable, Immediate results, Minimum training
List four disadvantages of a visual inspection
Surface damage only, can only detect large defects, misinterpretation of scratches, not accurate enough
What should the mechanic use as a guideline as assurance that nothing was missed during a walkaround?
A mechanic should used a checklist as a guideline as assurance that nothing was missed during a walkaround.
Upon completion of a borescope inspection you locate a discontinuity, what is the mechanic's next steps?
The mechanic must record the discontinuity with a written report for evaluation. The size, shape and location of the discontinuity must be included with the written report.
What is a discontinuity?
A discontinuity is an interruption in the normal physical structure or configuration of a part. A defect is a discontinuity that interferes with the function of a part. It can occur during manufacturing or in service.
When selecting the type of inspection method used what are some of the factors that should be considered?
Some factors that should be considered are Type and origin of discontinuity, Material manufacturing process, Accessibility of the component to perform NDT, Type of equipment available, Time available, Cost.
Define the term Non-Destructive Testing.
NDT is a method used to determine the conditions of components without harming or damaging it.
Name the types of N.D.T. methods.
Visual, Liquid Penetrant, Ultrasonic, Magnetic Particle, Eddy Current, Radiographic