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63 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the proper type of non-destructive inspection to use for locating surface cracks in an aluminum alloy casting or forging? |
Dye penetrant inspection |
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What inspection method will be most appropriate for checking a nonferrous metal part for intergranular corrosion? |
Eddy current inspection |
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What inspection method will be most appropriate for checking the internal structure of an airplane wing for corrosion? |
X-ray inspection |
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How does filiform corrosion usually appear on an aircraft structure? |
As thread like lines of puffiness under a film of Polyurethane or other dense finish system topcoats. |
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What inspection method would be most appropriate for checking a steel landing gear component for stress cracks? |
Magnetic particle inspection. |
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What type of inspection is best suited for detecting a fault within a piece of non-ferrous metal? |
An ultrasonic inspection. |
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Explain the procedure to use when making a dye penetrant inspection of a part. |
1 clean the part thoroughly 2. apply to penetrant 3. Allow to soak for the recommended dwell time 4. Remove all of the penetrant from the surface and apply the developer. |
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Why is it important that all parts are thoroughly cleaned before they are inspected with the dye penetrant inspect method? |
Because Grease or dirt may prevent the penetrant from seeping into the fault. |
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Explain the procedure to use when performing a magnetic particle inspection of a part? |
1. Thoroughly clean the part 2. Magnetize the part as directed by the appropriate service manual 3. Apply the indicating medium over the surface 4. Inspect under a black light 5. demagnetize the part after inspection is complete. |
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Why is it necessary to magnetize a part both circularly and longitudinally when inspecting steel part by magnetic particle method? |
Detect faults across as well as lengthwise within the part. |
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Does Circular magnetism detect parts that are across or lengthwise to the part |
Lengthwise |
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Why is it important that all engine parts which have been inspected by magnetic particle method be completely demagnetized? |
So that they don't attract steel particles that are produced by engine wear and may cause damage to bearings surfaces. |
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What is the principle of eddy current inspection? |
A current is induced into the metal being tested by a test probe. The amount of current is determined by the conductivity, mass, permeability of the material, and the presence of any fault or voids on the part being inspected. |
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Why is it important that a piece of aluminum alloy be quenched immediately after it is removed from the heat treating oven? |
Because a delay in quenching could result in the grain structure to grow enough that intergranular corrosion is likely to form within the metal. |
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What is meant by normalizing a piece of steel after it has been welded or machined? |
Remove stresses that are locked into the material by welding or the machining process. |
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Explain the way a steel structure is normalized after it has been welded? |
Heat the structure to a temperature above its critical temperature and allow it to cool in still air. |
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Why is a piece of steel tempered after it has been hardened? |
To remove some of its brittleness. |
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How is steel annealed? |
Heat to just about the upper critical temperature until it reaches uniform temperature throughout then allow to cool very slowly in the oven. |
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How is steel hardened? |
It is heated to its critical temperature and quenched in water, Brine or oil. |
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What is meant by tempering steel? |
When steel is hardened and some of the hardness is removed to relieve some of the internal stresses and brittleness. |
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What is meant by case hardening? |
When the surface of a metal is hardened by infusion of a carbon or an aluminum nitride so the interior of the metal remains strong and tough. |
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What are two methods of case hardening? |
Carburizing and nitriding. |
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How is steel nitrided? |
Steel is heated in an atmosphere with a compound of ammonia composing of nitrogen and hydrogen. The aluminum alloy element in the steel combines with the nitrogen to form an extremely hard aluminum nitride on the surface of the steel. |
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What is another name for precipitation heat treatment? |
Artificial aging. |
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Describe the method of solution heat treatment of aluminum alloy? |
The metal is heated and quenched and it's returned to the oven and heated to a lower temperature and it's held at this temperature for a specific time then removed from the oven and allowed to cool in still air. This increases the strength and hardness of the metal |
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What is meant by icebox rivet? |
Rivets made of 2017 or 2024 aluminum alloy it is heat treated and quenched then stored in a sub-freezing ice box until they are ready to be used. |
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What are the two most commonly used rivet heads? |
MS20470 Universal head and NS20426 100° Countersunk head. |
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What alloy is identified by the following rivet codes A, AD, D, DD, B? |
A is 1100 aluminum AD is 2117-T aluminum alloy D is 2017 - T aluminum alloy DD is 2024-T aluminum alloy B is 5056-T aluminum alloy |
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What is the meaning of this rivet designation MS20470AD4-6? |
MS20470 is Universal head AD is 2117-t aluminum alloy 4 is 4/32(1/8) inch diameter 6 is 6/16(3/8) inch long |
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What mark on the head of a rivet identifies the following alloys 2117-T, 2017-T, 2024-T 5056-T? |
2117-T is recessed dot 2017-T raised dot 2024-T raised double dash 5056-T raised cross |
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What type of loading should be avoided when using a self-locking nut on an aircraft bolt? |
Do not use on any application where there are rotational forces applied to the nut or to the bolt. |
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How tight should the nut be installed on a clevis bolt that is used to attach a cable fitting to a control surface horn? |
It should not be tight enough to prevent the clevis bolt from turning in the cable fitting and horn. |
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What determines the correct grip length of a bolt used in an aircraft structure? |
It should be the same as the combined thickness of the material being held by the bolt. |
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How tight should the nut be installed on a clevis bolt that is used to attach a cable fitting into a control surface horn? |
The nut should not be tight enough to prevent the clevis bolt from turning in the cable fitting on the horn. |
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What bolt is described by this number AN6 - 14A? |
AN6 is a Hex head bolt, 6/16 or 3/8 inch diameter. 14 is the length or 1-1/2 inch long A indicate shank is not drilled for a cotter pin. |
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What is indicated by a triangle on the head of a steel bolt? |
A close tolerance bolt. |
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What is the correct application for self-tapping sheet metal screws on an aircraft? |
They maybe used to hold non structural components onto the aircraft. |
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How can you tell when a self locking nut must be discarded? |
When you can screw the nut into the bolt without using a wrench. |
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What is a channel nut? |
A series of nuts mounted loosely in a channel that is reveted to the aircraft structure. |
This allows installing of screws in a channel nut without having to hold the nut with a wrench. |
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Of what two materials are cotter pins made? |
Low carbon steel and corrosion resistance steel. |
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What is the smallest size cable that is allowed to be used in the primary control system of an aircraft? |
1/8 inch diameter cable. |
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What type of control cable must be used when pulleys are used to change the direction of cable travel? |
Extra flexible cable of 7x19 |
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What is the basic wood used for aircraft Wing spars? |
Sitka spruce |
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What type of fabric is most widely used for covering aircraft structures? |
Heat shrinkable polyester fabric. |
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What is the alloy number of the most commonly used aluminum alloy for aircraft structural use? |
2024-T |
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What is the alloy number of a high strength aluminum alloy that has zinc as an annoying component? |
7075 |
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Why is it very important that the surface of a piece of clad aluminum alloy is not scratched? |
It could be exposed to corrosion which is likely to form. |
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Why is it important that a piece of aluminum alloy be quenched immediately after it's removed from the heat treating oven? |
If delayed the aluminum alloy is likely to form grain structures that could grow into intergranular corrosion in the metal. |
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What is meant by precipitation heat treatment of a piece of aluminum alloy? |
By holding the aluminum that has been solution heat treated at a specific temperature for a period of time also known as artificial aging. |
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What type of composite material is used when stiffness is the prime requirement? |
Graphite or carbon |
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Explain the way a piece of aluminum alloy is solution heat treated? |
Heat the piece of aluminum alloy in the oven to a proper temperature for a specified time and then remove and quench in water. |
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What type of composite material is used when toughness is the prime requirement? |
Kevlar |
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How does a filiform corrosion usually appear on an aircraft structure? |
In the form of thread-like lines of puffiness under a film of Polyurethane or other dense finish system topcoats |
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What determines the size of the torch tip that is to be used when gas welding steel? |
Thickness of the material being welded. |
Because the size of the torch orifice determines the amount of flame produced thus the amount of heat going into the metal being welded. |
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How is the welding flux removed from a piece of aluminum that has been gas welded? |
By scrubbing with a Bristle brush and hot water. |
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What must be done to a welded joint if it must be rewelded? |
All traces of the old weld must be removed so new weld would penetrate the base metal. |
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What kind of measuring instrument is used to measure the round out of an aircraft engine crankshaft? |
Dial indicator |
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What measuring instruments are used to measure the fit between a rocker arm shaft and its bushings? |
Micrometer caliper for the outside diameter of the shaft and a telescopic gauge and micrometer caliper for the inside of the bushing. |
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In what increments can a micrometer caliper be read? |
One thousandth (0.0001) |
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What is the advantage of a vernier caliper over a micrometer caliper? |
The vernier has a greater range than a micrometer caliper. |
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What precision tool is used to measure Piston Ring side clearance? |
Thickness gage |
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What precision tools are used to measure the inside diameter of a cylinder? |
Telescopic gage and micrometer caliper. |
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What precision tools are used to measure the inside diameter of a small hole? |
A small hole gage and micrometer caliper |
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