AMT Shop Practices Final Study Guide

Pure aluminum surface layers on an aluminum alloy core

What does alclad metal consist of?

Stainless steel

What is generally used in the construction of aircraft engine firewalls?

Standard steel bolts

Aircraft bolts with a cross or asterisk marked on the bolthead are:

Material

In general bolt grip lengths should equal the ________ thickness.

AC 43.13 B

Where can the recommended torque value for a nut be found if it is not given?

Only for shear load applications

Where is a clevis bolt used in an airplane?

Change washers and try again

If a cotter pin hole does not align within the recommended torque range, what is the acceptable practice?

AN corrosion-resistant steel bolt

A bolt with a single raised dash on the head is classified as a:

NAS close tolerance bolt

A bolt with an "X" inside a triangle on the head is classified as an:

Class 3 fit for the threads

Aircraft bolts are usually manufactured with a:

99% commercially pure aluminum

What does the aluminum code 1100 identify?

The major alloying element (copper)

In the four digit aluminum index system number 2024, the first number indicates:

14 days

How long can icebox rivets be stored before they must be heat treated again before use?

2117 aluminum alloy (field rivet)

What does the AD indicate in a MS20426AD6-7 rivet?

Diameter (6/32") & length (7/16")

What does the 6-7 indicate in a MS20426AD6-7 rivet?

Universal head rivet

What rivet can replace all protruding head rivets?

AD (A dimple)

A rivet with a recessed dot (dimple) has a letter designation of:

32nd inch increments

What unit of measurement is used for the diameter of a rivet?

16th inch increments

What unit of measurement is used for the length of a rivet?

True

Plain and jam (check) nuts come in left and right hand threads.

100 degrees

Most aircraft rivets of the countersink type have heads with an angle of:

250 degrees Fahrenheit

A fiber self locking nut should not be used where the temperature is above:

2000 series

The primary alloying ingredient is copper for which aluminum alloy?

7000 series

The primary alloying ingredient is zinc for which aluminum alloy?

Malleable

A metal that can be hammered, rolled, or pressed into place without cracking or breaking is considered to be _________.

Heat treated

Aluminum alloy must be ____ ________ for use as a structural part.

Thermal expansion

When a metal expands due to temperature this referred to as _______ _________.

Yes

Does carbon added to iron give it strength?

Iron

The term ferrous metal applies to metals having ____ as their primary constituent.

Magnetism

Most ferrous metals have a phenomenon referred to as _________.

41XX chrome-malybdenum

One of the most widley used steels is ____ _____ _______ steel.

1000 series

What series is aluminum that is 99% pure?

No

Are pure aluminum alloys used for structural applications?

Pure aluminum surfaces/cladding

What does alclad aluminum have?

T3 (2024-T3)

What is the most used indicator for 2024 aluminum?

T6 (7075-T6)

What is the most common used indicator for 7075 aluminum?

0

2024 or 7075 in the annealed state is identified by a _ following the material identification.

Wear resistant case

Case hardening produces a ____ _________ _____ over a strong tough core.

Annealed

Steel has its lowest strength in the ________ state.

1/32 inch

What unit of measurement is used for the diameter of a rivet?

1/16 inch

What measurement is used for the length of a rivet?

Copper

What is the primary alloying material used in 2117-T4 aluminum alloy?

Magnesium

What is the primary alloying material used in 5056 aluminum alloy?

Zinc

What is the primary alloying material used in 7075 aluminum alloy?

3/64 inch to 1/8 inch

What is the minimum amount of rivet material that must protrude through the combined thicknesses being joined to form a shop head?

Inspection/testing used to determine the airworthiness of a component or part without damaging it

What is non-destructive inspection/testing?

A borescope

What is used to examine the inside of a reciprocating engine cylinder without disassembling the whole engine?

Liquid Penetrate Testing

Nonporous materials can be checked for defects open to the surface through ______ _________ inspection.

An NDI technique that uses sound energy moving through the test specimen to detect flaws

What is ultrasonic inspection?

Magnetic particle

________ ________ inspection is a method of detecting invisible cracks and other defects in ferromagnetic materials.

Perpendicular

To locate a defect in a part, it is essential that the magnetic lines of force pass approximately ______________ to the defect.

Radiographic

____________ inspection techniques are used to locate defects or flaws in airframe or engines with little or no disassembly.

A quick evaluation of any accessible surface to detect the presence of delamination or debonding in composite structures.

What is tap testing?

Liquid penetrate inspection

What inspection method requires applying a developer?

Eddy current inspection

What inspection method uses an electromagnetic field to measure a difference in hardness rates within a metal part?

Acoustic emission inspection

This inspection method involves placing sensors at various locations on an aircraft structure, applying a load or stress, and measuring the sound waves that are emitted by cracks or areas of corrosion?

need to look

This inspection method can detect cracks, laps, seams, cold shuts, inclusions about and within a metal part by passing electric current through the part is called:

need to check

The induction of a magnetic field consisting of concentric circles of force about and within a metal part by passing electric current through the part is called:

Magnaglo inspection

Magnetic particle inspection using a fluorescent solution and a black light is called:

The part is 1 or 2 feet from the opening

Demagnetizing current should not be cut off until:

No

Is temperature a factor in preparing for radiographic exposure?

A sphere like flaw

A gas cavity, as seen in a radiograph looks like:

An acetylene tank & regulator, an oxygen tank & regulator, a torch, and the fill rod

What equipment is involved in gas welding?

The electrode holder, an electrode, the ground, and a supply of power

What equipment is involved in stick welding?

It shields the molten puddle from oxygen

What is the function of the inert gas in welding?

Using chill bars or welding fixtures to absorb the heat

What methods can be used to control expansion and contraction when performing a straight butt joint weld to join two sheets?

Gas Welding

___ _______ is accomplished by heating the ends or edges of metal parts to a molten state with a high temperature flames.

Shielded metal arc welding (SMAW)

________ _____ ___ _______ is the most common type of welding and is usually referred to as "stick" welding.

Tungsten Intert Gas welding, umlike other types of electric arc welding, the electrode is not consumed; rather, a filler rodi s manually fed into the molten puddle

What is TIG welding?

Spot welding

Current flows through the material and the two copper electrodes on a/an ____ _______ machine, and the greater resistance of the material compared to the copper melts the materials and forces the molten spots to unite.

1/8 inch

Filler rod is added to the puddle in the amount that provides for the completed fillet to be built up about ________ the thickness of the base metal.

Chrome molybdenum

When welding _____ ___________ that's more than 3/16 inch thick, the surrounding area must be preheated to a temperature between 300 degrees F and 400 degrees F before beginning to weld so that a brittle grain structure does not result.

Nonferrous

Lead, copper, magnesium, and aluminum are classified as __________ metals because they contain no iron.

Argon

When TIG welding aluminum, ______ is preferred as a shielding gas because it provides better cover and better cleaning action than the alternative gas, helium.

Arc

In TIG welding, the welding ___ is established by touching the base metal plate with the electrode and immediately withdrawing it only about 1/4 inch or less from the base.

Crater

If the arc is broken during the welding of a bead and the electrode is removed quickly a/an ______ is formed at the point where the arc ends by the pressure of the gases from the electrode tip forcing the weld metal way from the bead.

Fillet welds

What welds are used to make tee and lap joints?

expansion

Unven heating of metal causes uneven _________ which sets up stressed within the metal.

butt joints

A/An _____ ______ made by placing two pieces of material edge to edge, without overlap, and then welding.

An inert gas released from melted flux

In SMAW, the molten puddle of metal is shielded from oxygen by:

Shielded metal arc welding (SMAW)

This type of welding typically uses a low-voltage, high current DC power source.

Welding aluminum or magnesium

In TIG welding, the power supply should be set to AC for:

Argon

In plasma arc welding, the plasma gas is usually:

Flashback arrestor

This important piece of welding gear prevents a high-pressure flame or oxygen-fuel mixture from being pushed back into either cylinder and causing an explosion.

Cutting torch

Out of this list of torches, which one uses the highest pressure?

Stainless steel

Which of these should not be welded with a neutral flame?

That the weld must be completely removed and replaced

A dark blue film on a titanium weld indicates:

1/4 inch

An arc weld should have the edges beveled and be done in multiple passes on any plate thicker than:

Groove weld

Butt joints where the metal to be welded is 1/4 inch thick or more should be welded with a:

1/8 inch

A gas weld should have the edges beveled on any plate thicker than:

Leather, closed toe shoes, welding mask, etc

Describe the protective clothing for oxyfuel gas and arc welding?

Retinas can burn due to the bright UV light exposure

In arc welding, why is proper eye and face shielding devices particularly important?

No, because self ignition of the oil/grease can occur

Should oxygen cylinder valves ever come into contact with oil or grease and why?

High pressure gas could directly or indirectly (via debris) injure you

What are the risks associated with standing in front of a regulator when opening cylinder valves?

Close valves, pressurize system (slightly), inspect for leaks

What is the correct procedure for testing for leaks in an oxyacetylene welding system?

Backfire is just a external burn, flashback burns back up the line

How does backfire differ from a flashback?

Shut off valves, extinguish flames, and inspect

What should be done in the event of a backfire or flashback?

Risk prevention, clean working area, less risk of a fire

Why should used containers be thoroughly cleaned before any welding or cutting is done on them?

Bad grounds could mean a bad/weak weld, not enough current, danger of shock

Why should all electrical welding equipment be properly grounded?

In case of emergencies

What is the significance of having each welding machine equipped with a power disconnect switch?