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25 Cards in this Set
- Front
- Back
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What special precautions must be taken when repairing a radome? |
Nothing must be done to the radome that will affect its electrical transparency or its aerodynamic strength. |
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What are 3 requirements for a repair to a piece of sheet metal aircraft structures? |
The repair must restore the lost strength and rigidity, and it must not change the aerodynamic shape of the part. |
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What type of device is a Cleco fastener? |
A patented fastener that is inserted in the rivet holes and is used to hold 2 pieces of sheet metal together until they can be riveted. |
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What is the main function of throatless shears in an aircraft sheet metal shop? |
Throatless shears are used to cut mild carbon steel up to 10 gauge, and stainless steel up to 12 gauge. They can be used to cut irregular curves in metal. |
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What is the purpose of a sight line when laying out sheet metal to be bent in a cornice brake? |
The sight line allows the jaw of a cornice brake to be positioned so the bend made by the brake will start at the bend tangent line. |
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When making a riveted repair to an aircraft sheet metal structure, which should be the strongest, the shear strength of the rivet, or the bearing strength of the metal sheet? |
The 2 strengths should be close to each other, but the bearing strength of the sheet should be greater. |
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What kind of stress is in the upper skin of an aircraft wing in flight? |
Compression. |
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What is meant by the bend allowance used in making a bend in a piece of sheet metal? |
The bend allowance is the amount of metal that is actually used in making the bend in a piece of sheet metal. |
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What determines the minimum bend radius that can be used with a piece of sheet metal? |
The thickness of the material and its hardness. |
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What is meant by setback when bending a piece of sheet metal in a cornice brake? |
Setback is the distance the jaws of the brake must be set back from the mold line to form the bend. |
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What is meant by a joggle in a piece of sheet metal? |
A joggle is a small offset near the edge of sheet metal that allows the sheet to overlap another piece of metal. |
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When drilling stainless steel, should the drill be turned fast or slow? |
It should be turned slowly. |
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When hand-forming a piece of sheet metal that has a concave curve, should it be started in the center of the curve or at its edge? |
Start at the edge and work towards the center. |
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How is the point of a twist drill ground that is to be used for drilling transparent acrylic material? |
The cutting edge should be dubbed off to a zero rake angle, and the included angle of the tip should be ground to 140°. |
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What causes crazing in a piece of transparent acrylic material? |
Uneven stresses in the material, usually caused by heat. |
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What is the purpose of anodizing a piece of aluminum alloy, and how is it applied? |
Anodizing is a protective film that is deposited on the surface of aluminum alloy by an electrolytic process. |
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What kind of metal forming is done by a slip roll former? |
Simple curves with a large radius. |
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What must be done to the flanges of an angle for it to be curved? |
The flanges must be stretched for a convex curve and shrunk for a concave curve. |
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What is the minimum edge distance allowed when installing rivets in a piece of aircraft sheet metal structure? |
Two times the diameter of the rivet. |
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What is the recommended transverse pitch to use when making a riveted two-row splice in a piece of sheet metal. |
3/4 of the pitch of the rivets in the rows. |
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Why should aluminum alloy rivets be driven with as few blows as is possible? |
Excessive hammering will work-harden the rivets and make them difficult to drive. |
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What type of metal should be hot-dimpled? |
7075-T6, 2024-T81 aluminum and magnesium alloys should be hot-dimpled. |
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What determines whether a piece of sheet metal should be dimpled or countersunk when installing flush rivets? |
The thickest of the sheet; counter-sinking should be done only when the thickness of the sheet is greater than the thickness of the rivet head. |
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What kind of repair can be made to a small damage of the core material and one face sheet of a piece of aluminum alloy honeycomb structure? |
A potted compound repair. |
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Why are the lightning holes in a sheet metal wing rib flanged? |
Flanging the lightning holes gives the rib rigidity. |
