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Materials and Processaes - J
Terms in this set (26)
1. How do you "work harden" a piece of metal?
By cold working the metal.
2. Describe the primary difference between a thermosetting and a thermoplastic resin.
A thermosetting resin doesn't soften when heated and chars or burns rather than melting. Thermoplastic resins become soft and pliable when heated, and harden when cooled.
3. Explain how thermoplastic and thermosetting resins are commonly used in modern aircraft.
Plexiglass is a thermoplastic resin commonly used for windshields and windows. Thermosetting resins are most often used as the matrix material in composite structures.
4. Name one of the types of resin commonly used as a matix material for aircraft composite laminates.
Polyester resin or Epoxy resin.
5. What are some of the materials that are commonly used as the reinforcing component in a composite structure?
Fiberglass, Aramid (Kevlar), Graphite (Carbon) fiber, linen, and paper.
6. What are the reasons that alloy steel that is responsive to heat treatment is usually less suitable for welding?
It may become brittle and lose its ductility in the area of the weld.
7. Give one advantage of pre-preg (pre-impregnated) materials, other than saving time in the construction or repair of composite components.
(1) Pre-preg fabrics contain the correct amount of matrix.
(2) The matrix material evenly and completely permeates the reinforcing fibers.
(3) The matrix has the resin and hardener in the correct proportions.
1. What is indicated by the markings on the heads of solid shank rivets?
The material that they are made of, and indirectly, their strength.
2. How can you keep heat treated aluminum alloy rivets soft enough to install after the quenching process?
If the rivets are stored in a freezer they will remain soft for several days.
3. What is the grip length of a bolt?
The length of the unthreaded portion.
4. In what way are AN standard steel bolts identified?
By the code markings on the bolt heads.
5. What is the difference between a close tolerance bolt and a general purpose bolt?
Close tolerance bolts are machined to more accurate dimensions.
6. For what types of applications are self-locking nuts not allowed?
Self-locking nuts may not be used when either the bolt or the nut is subject to rotation.
7. If the maintenance procedures do not specify a torque value for a bolt or nut, how can you determine the proper values?
Consult a standard torque table such as found in AC 43.13-1B.
8. What is the most commonly used type of aircraft control cable?
Extra flexible 7 x 19 stainless steel cable.
1. What type of precision measuring instruments can be used to measure the outside diameter of aircraft parts?
Outside micrometers and vernier calipers.
2. For what reason should a micrometer be periodically calibrated?
If dropped, its accuracy may be affected.
If the spindle is over-tightened, the frame may be sprung.
Continually sliding objects between the anvil and the spindle may wear the surfaces.
1. Describe the steps involved in a dye penetrant inspection.
The surface is cleaned, and then penetrant is applied and allowed to dwell for a specified time.
The penetrant is then removed with an emulsifier cleaner.
Once removed, the part is dried and then developer is applied. The results are then inspected and interpreted.
2. Name some tools that are commonly used to assist in making visual inspections of welds.
A magnifying glass, flashlight, mirror, and, possibly, a borescope.
3. What are some of the non-destructive testing methods that may be used on aluminum parts?
Visual, dye penetrant, eddy current, ultrasonic testing, and radiography.
4. What process occurs during the preparation stage of a dye penetrant inspection when the penetrating liquid is applied, and then removed from a cracked part?
The penetrant enters the cracks by capillary action and remains there until made visible by the developer.
5. A correctly made butt weld will have what bead width and how much penetration?
The bead width should be 3 to 5 times the thickness of the base metal and there must be 100% penetration.
6. What telltale characteristics are evidence of a cold weld?
A cold weld has rough, irregular edges that are not feathered into the base metal and has variations in penetration amounts.
7. The penetration of a fillet weld should be what percentage of the thickness of the base metal?
25 to 50 percent.
8. Describe the basic steps for conducting a magnetic particle inspection.
Magnetize the part, then coat the surface with ferromagnetic particles. If a defect or discontinuity is present, the particles align with the discontinuity forming a visible pattern.
1. What type of steel is used to make engine mounts and landing gears?
4130 chromally steel.
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