METALLIC STRUCTURE

Select the alternative which best describes the function of the flute section of a twist drill. Provides a method for cooling oil to be delivered to the cutting surface. Forms the area where the drill bit attaches to the drill motor. Forms the cutting edges of the drill point.

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What should be the included angle of a twist drill for hard metal?. 118°. 100°. 90°.

When comparing the machining techniques for stainless steel sheet material to those for aluminum alloy sheet, it is normally considered good practice to drill the stainless steel at a. higher speed with less pressure applied to the drill. lower speed with more pressure applied to the drill. lower speed with less pressure applied to the drill.

If a streamline cover plate is to be hand formed using a form block, a piece of dead soft aluminum should first be placed over the hollow portion of the mold and securely fastened in place. The bumping operation should be. distributed evenly over the face of the aluminum at all times rather than being started at the edges or center. started by tapping the aluminum lightly around the edges and gradually working down into the center. started by tapping the aluminum in the center until it touches the bottom of the mold and then working out in all directions.

When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be. the shear strength of the riveted joint. to use rivet spacing similar to a seam in the skin. that the bond between the patch and the skin is sufficient to prevent dissimilar metal corrosion.

What purpose does flux serve in welding aluminum?. Removes dirt, grease, and oil. Minimizes or prevents oxidation. Ensures proper distribution of the filler rod.

MS20426AD-6-5 indicates a countersunk rivet which has. a shank length of 5/16 inch (excluding head). a shank length of 5/32 inch (excluding head). an overall length of 5/16 inch.

(Refer to Figure 5.) What is the length of flat A?. 3.7 inches. 3.8 inches. 3.9 inches.

Clad aluminum alloys are used in aircraft because they. are naturally corrosion resistant, so they do not require corrosion resistant materials for protection. have surface layers of pure aluminum or aluminum alloy bonded to the core material to inhibit corrosion. are highly corrosion resistant because an oxide film forms on their surfaces upon contact with air.

Under certain conditions, type A rivets are not used because of their. low strength characteristics. unique design that causes crazing or cracking. tendency toward embrittlement when subjected to vibration.

How many MS20470 AD-4-6 rivets will be required to attach a 10 x 5 inch plate, using a single row of rivets, minimum edge distance, and 4D spacing?. 56. 54. 52.

In selecting a torch tip size to use in welding, the size of the tip opening determines the. amount of heat applied to the work. temperature of the flame. melting point of the filler metal.

Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally. repairable, using approved methods. repairable, except when subjected to compressive loads. not repairable, but must be replaced when damaged or deteriorated.

When soldering close fitting parts, solder is drawn into the space between the two parts by. capillary action. the dissimilar temperatures of the parts. the pressure caused by the flame of the soldering torch.

The dimensions of an MS20430AD-4-8 rivet are. 1/8 inch in diameter and 1/4 inch long. 1/8 inch in diameter and 1/2 inch long. 4/16 inch in diameter and 8/32 inch long.

Which of the following need not be considered when determining minimum rivet spacing?. Rivet diameter. Rivet length. Type of material being riveted.

The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the. bend allowance. minimum radius of bend. maximum radius of bend.

(Refer to Figure 3.) Which is the grip length of the flush rivet?. 1. 2. 3.

When a butt-welded joint is visually inspected for penetration, the penetration should be. 50 percent of the thickness of the base metal. 100 percent of the thickness of the base metal. 75 percent of the thickness of the base metal.

Which rivets should be selected to join two sheets of .032-inch aluminum?. MS20425D-4-3. MS20470AD-4-4. MS20455DD-5-3.

In Gas Tungsten Arc (GTA) welding a stream of inert gas is used to. prevent the formation of oxides in the puddle. concentrate the heat of the arc and prevent its dissipation. lower the temperature required to properly fuse the metal.

What is indicated by a black 'smoky' residue streaming back from some of the rivets on an aircraft?. Filiform corrosion is occurring between the rivets and the skin. Intergranular corrosion is occurring between the rivets and the skin. Fretting corrosion is occurring between the rivets and the skin.

Which statement best describes magnesium welding?. Magnesium can be welded to other metals. Filler rod should be nickel-steel. Filler rod should be the same composition as base metal.

When repairing puncture-type damage to a metal-faced laminated honeycomb panel, the edges of the doubler should be tapered to. two times the thickness of the metal. 100 times the thickness of the metal. whatever is desired for a neat, clean appearance.

Which rivet is used for riveting nickel-steel alloys?. 2024 aluminum. Mild steel. Monel.

A factor which determines the minimum space between rivets is the. length of the rivets being used. diameter of the rivets being used. thickness of the material being riveted.

High pressure cylinders used to transport and store acetylene must. be pressure tested to 3,000 psi. be green in color. contain acetone.

A very thin and pointed tip on a soldering copper is undesirable because it will. transfer too much heat to the work. have a tendency to overheat and become brittle. cool too rapidly.

What is the minimum edge distance for aircraft rivets?. Two times the diameter of the rivet shank. Two times the diameter of the rivet head. Three times the diameter of the rivet shank.

When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?. Treat the surfaces to be riveted together with a process called anodic treatment. Place a protective separator between areas of potential electrical difference. Avoid the use of dissimilar metals by redesigning the unit according to the recommendations outlined in AC 43.13-1A.