Materials in process

Question 1

Describe the steps for a dye, penetrant inspection

Answer 1

The surface is cleaned. The penetrate is applied in allowed to dwell for specified time, the penetrant is removed with an emulsifier or cleaner, dye the part and apply the developer inspect defects

Question 2

Name some tools that are commonly used to assist in making visual inspections of welds

Answer 2

Magnifying glass, flashlight mirror, and possibly a borescope

Question 3

What are some of the nondestructive testing methods that may be used on aluminum components

Answer 3

Visual dye penetrant eddy, current ultrasonic, testing and radiography

Question 4

Which nondestructive testing method can be performed without removing the surface coatings such as primer, paint, anodized films, and is effective in detecting surface and sub surface corrosion

Answer 4

Eddy current inspection method

Question 5

What process occurs during the penetration stage of a dye penetrant inspection when the penetrating liquid is applied, and then removed from a cracked part

Answer 5

The pitcher enters the crack by capillary action, and remains there, until made visible by the developer

Question 6

Name the different types of hardness tester, used on steel and other alloys such as aluminum

Answer 6

Rockwell, brinnell in Barcol

Question 7

Which steel alloy is noted for its toughness, and is most commonly used for aircraft tubular structure, such as frame, members, engine, mounts, landing gear, parts, and other structural parts

Answer 7

Chromalloy , chrome-molybdenum steel

Question 8

A correctly made, butt weld will have what bead with and how much penetration

Answer 8

The bead width should be 3 to 5 times the thickness of the base metal, and there must be 100% penetration

Question 9

What are the characteristics of a cold weld

Answer 9

A cold world has rough, irregular edges that are not feathered into the base material and has variations in penetration amounts

Question 10

The penetration of a fillet weld should be what percentage of the thickness of the base metal

Answer 10

25 to 50%

Question 11

What is the term used that applies to the group of metals that has iron as its principle constituent

Answer 11

Ferrous

Question 12

Describe the basic steps for conduction, a magnetic particle inspection

Answer 12

Magnetized 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

Question 13

What is indicated by the markings on the heads of a solid shank rivet

Answer 13

The material that they are made of, and indirectly their strength

Question 14

How can you keep heat treated aluminum alloy rivet soft enough to install after quenching process

Answer 14

If the rivets are stored in a freezer, they will remain soft for several days

Question 15

What is the grip length of a bolt?

Answer 15

From the bottom of the boat head to where the threads start, the length of the unthreaded portion of the bolt

Question 16

What does the grip length of a bolt correspond to?

Answer 16

The thickness of the material being fastened with the bolt

Question 17

In what way are AN standard steel bolts identified

Answer 17

By the code markings on the bolt heads

Question 18

What is the difference between a close tolerance, bolt, and a general purpose bolt?

Answer 18

Close tolerance bolts are machine to more accurate dimensions

Question 19

When referring to a standard torque chart, how can a 1/4 x 28 size bolt be defined

Answer 19

It is a 1/4 inch diameter bolt with a thread count of 28 threads per inch

Question 20

The diameter of AN standard steel bolt as in the part number AN3-5 is measured in what fractional increment

Answer 20

1/16th of an inch the AN3 is a 3/16” diameter bolt

Question 21

What are the basic types of washers?

Answer 21

Plain,lock, special

Question 22

What hardware is used as a threaded bushing to repair threads

Answer 22

Helicoil

Question 23

For what types of applications are self locking nuts allowed

Answer 23

Self locking nuts may not be used when either the bolt or the nut is subject to rotation

Question 24

If the maintenance procedures don’t specify a torque value for a bolt or nut how can you determine the proper values?

Answer 24

Consult a standard torque table, such as the one and AC43.13–1B

Question 25

What type of precision measuring instrument can be used to measure the outside dimensions of aircraft parts

Answer 25

Outside micrometers in vernier calipers

Question 26

For what reasons should a micrometer be periodically calibrated?

Answer 26

If dropped, its accuracy may be affected, or if the spindles is over tightened, the frame may be sprung or continually sliding objects between the anvil, and the spindle may wear surface 

Question 27

How do you work hard in a piece of metal?

Answer 27

By cold, working the metal

Question 28

Describe the difference between thermosetting and a thermal plastic resin

Answer 28

A thermosetting resin doesn’t soften when heated and chares, or burns rather than melting. Thermoplastic resins become soft and pliable when heated and hardened when cooled

Question 29

Explain how thermoplastic and thermosetting resins are commonly used in modern aircraft

Answer 29

Plexiglass is a thermalplastic resin commonly used for windshield and windows, Thermosetting residents are most often used as the matrix material in composite structures

Question 30

Name one of the types of resin commonly used as a matrix material for aircraft, composite laminate

Answer 30

Polyester, resin, or epoxy resin

Question 31

What are some of the materials that are commonly used as the reinforcing component of a composite structure

Answer 31

Fiberglass, Kevlar, carbon fiber, Linen, paper

Question 32

What are reasons that alloy steel that is responsive to heat? Treatment is usually less suitable for welding.

Answer 32

It may become brittle and lose its ductility in the area of the weld

Question 33

Give one advantage of a pre-Preg (pre-impregnated) materials, other than saving time in the construction or repair of composite components

Answer 33

Pre-preg fabrics contain the correct amount of matrix.

Question 34

What are advantages of using composites in aircraft?

Answer 34

High strength to weight ratio, longer life than metals, higher corrosion resistance, easy to repair

Question 35

What is potting compound used for in bonded honeycomb repairs

Answer 35

Filling, small holes, 1 inch or less