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What is the main stress aircraft rivets are designed to take? Keep in mind that rivets join metal together in an environment subject to continual flexing, and expansion and contraction.
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A type of fuselage construction designed to have the loads carried and transmitted by the substructure (for example: stringers and longerons) is known as:
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Final Review
| Question | Answer |
|---|---|
| What is the main stress aircraft rivets are designed to take? Keep in mind that rivets join metal together in an environment subject to continual flexing, and expansion and contraction. | Shear |
| A type of fuselage construction designed to have the loads carried and transmitted by the substructure (for example: stringers and longerons) is known as: | Semi-Monocoque |
| A width measurement left or right of the vertical center line of the aircraft is the: | Butt Line |
| The property which enables a metal to return to its original shape, when the force which causes the change of shape is removed is known as: | Elasticity |
| The neutral axis of a bend is: | a line created by the points where the compressive load of the bend equals the tension load |
| Bend allowance refers to the | amount of material in a flat-pattern layout that must be allocated to make a bend |
| Setback is the | distance between the bend tangent line and the mold point |
| The radius of a universal rivet set used to drive rivets is | slightly greater than that of the appropriate rivet head |
| The proper drill bit for an MS20470AD3-4 rivet is a number: | 40 |
| The minimum acceptable dimensions, where D equals the diameter of the shank, for a properly driven rivet buck tail is | height 0.50 D, width 1.5 D |
| Which of the following is not a type of aircraft flap? | Rutan |
| Which rivet should be used for joining two pieces of 0.020 inch aluminum alloy? Keep in mind the standard for determining the length and width of rivets. | MS20470AD3-3 |
| A universal head rivet is identified by the number | MS20470 |
| What is the bend allowance for a 90-degree bend in a piece of 0.064 inch material bent over a 3/16 inch radius? | 0.340 |
| Why can aviation snips cut ticker metal than common hand snips? | They have a compound leverage type handle design |
| As a general rule the diameter of a rivet should be | Equal to three times the thickness of the thickness sheet of the joint material |
| K-factor charts calculate | The setback |
| What color cleco fastener is used for a #11 hole? | Brass |
| True or False, the spring brake is not a straight line sheet metal forming machine | True |
| The use of pencils for marking on sheet metal parts should be avoided because | They harden the sheet in area of the mark |
| Clad aluminum alloys are used on aircraft because they | Are less subject to corrosion than uncoated aluminum alloys |
| True or false, cantilever wings have no external bracing. | True |
| When fabricating part from alclad 2024-T3 aluminum sheet stock, | When possible all bends should be made across the grain of the metal (not parallel to the grain direction) |
| The purpose of a relief hole is to | lighten the metal |
| Monocoque fuselages derive their principle strength from | Bulkheads, formers and skin |
| Minimum edge distance for universal head rivets is | 2 Diameters |
| True or false? Rivet edge distance is measured form the center of the rivet to the nearest edge. | True |
| When aluminum alloys are heat treated to their critical temperature and quenched, it is_____________ heat treated. | Solution |
| A rivet with a raised dot on the head would be a | 2017 |
| A rivet designated as a DD rivet would be which type of alloy? | 2024 |
| When brazing, the filler rod should be melted by | Touching the rod to the hot metal |
| __________ is the force per unit area tending to stretch a structural member. | Tension |
| ______________ is actually a combination of two forces acting upon a structural member at one or more points. | Bending |
| Damages that can be repaired by patching, splicing, and insertion without imparment of the original strength is considered: | Repairable damage |
| Whenever possible, use of an elongated octagonal patch for a repair of a smooth skin because this type of patch | Eliminates dangerous stress concentrations |
| The design of major structural repairs not included in the aircraft’s maintenance or structural repair manual must be | Submitted on a form 337 and approved by the FAA |
| The primary function of a fastener in a lap joint is to | Transmit the loads from one layer of the patch to another |
| What should be the included angle of a twist drill for standard sheet metal work? | 118 |
| The load-carrying capabilities of a rivet of any given material are a function of the | the diameter of the rivet |
| What is the usual result of making a bend with too small a radius? | the material is likely to crack |
| What is not a factors that enters into the amount of material required for bend allowance? | coarseness of the material |
| The proper drill bit for an AN470AD5-6 rivet is a number | 21 |
| What must be done to the face of a bucking bar to prevent its marring the rivet? | keep it clean and polished (smooth) |
| What is the best way of accurately locating a rivet hole for drilling in a sheet metal skin? | use a center punch |
| The following metal and rivet combination would be properly matched. | AN470AD4 rivets in .040 2024 sheet |
| 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 | lower speed with more pressure applied to the drill |
| In making wing skin repairs, | rivets selected should be the same alloy as the material being riveted. |
| The identifying marks on the heads of aluminum alloy rivets indicate the | specific alloy used in the manufacture of the rivet. |
| What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment? | retard age hardening |
| What is the purpose of a lightening hole in a wing rib? | to reduce weight without reducing strength |
| Why should the edges of a circular patch be chamfered and turned down slightly? | to provide a tighter fit on the skin surface |
| A file with two rows of teeth, one row set at 75 degrees and the other row set at 45 degrees, is known as a _____________ file | Double cut |
| How large should the center punch mark be for starting a drill in aluminum alloy skin? | just large enough for the drill to begin cutting, but not made heavy enough to distort the skin. |
| Where a rectangular cutout is used, the radius at each corner should be no less than __________ inch. | 1/2 |
| The starting and ending points of the bend are known as | Bend Tangent Lines |
| Why should a carburizing flame be avoided when welding steel? | it hardens the surface |
| Which item listed below is the most important consideration when selecting a welding rod? | type of metal to be welded |
| In gas welding, the amount of heat applied to material being welded is controlled by | the size of the tip opening |
| In electric-arc welding, the arc is struck between the metal to be welded and the | electrode |
| A flashback is | the burning back of the flame into (or behind) the mixing chamber of the torch |
| An oxyacetylene flame whose inner cone has a sharp point and burns with a hissing sound is a/an: | oxidizing flame |
| Acetylene hoses are | red with left-hand thread fittings |
| Which is correct concerning the use of a file? | Apply pressure on the forward stroke, only, except when filing very soft metals such as lead or annealed aluminum |
| The primary alloying agent of 2024-T36 is indicated by the number | 2 |
| Which rivet may be used as received without further treatment? | 2117-T3 |
| A piece of flat stock that is to be bent to a closed angle of 15 degrees must be bent through an angle of | 165 degrees |
| The purpose of a joggle is to | Allow clearance for a sheet or an extrusion |
| Welding over a brazed or soldered joint is | Not permitted |
| 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 |
| Filing or grinding a weld bead | Reduces the strength of the joint |
| What is the bend allowance for .040 material thickness, 3/16th bend radius, with a 85° bend? | .305 |
| What is the bend allowance for .064 material thickness, 1/8th bend radius, with a 45° bend? | .120 |
| What is the set back for .040 material thickness, 3/16th bend radius, with a 85° bend? | 208 |
| What is the set back for .064 material thickness, 1/8th bend radius, with a 45° bend? | .078 |
| What is the set back for .040 material thickness, 1/8th bend radius, with a 60° bend? | .095 |
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PetersAviation