Structures ShtMtl

A well designed rivet joint will subject the rivets to. tension loads. shear loads. compressive loads.

A main difference between Lockbolt/ Huckbolt tension and shear fasteners (other than their application) is in the. method of installation. number of locking collar grooves. shape of the head.

Alloy 2117 rivets are heat treated. to a temperature of 910 to 930 OF and quenched in cold water. by the manufacturer and do not require heat treatment before being driven. by the manufacturer but require reheat treatment before being driven.

The general rule for finding the proper rivet diameter is. three times the thickness of the thickest sheet. two times the rivet length. three times the thickness of the materials to be joined.

The shop head of a rivet should be. A - one and one-half times the diameter of the rivet shank. B - one and one-half times the diameter of the manufactured head of the rivet. C - one-half times the diameter of the rivet shank.

One of the main advantages of Hi-Lok type fasteners over earlier generations is that. A - the squeezed on collar installation provides a more secure, tighter fit. B - they can be removed and reused again. C - they can be installed with ordinary hand tools.

The markings on the head of a Dzus fastener identify the. A - manufacturer and type of material. B -body type, head diameter, and type of material. C -body diameter, type of head, and length of the fastener.

The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in. A - sixteenths of an inch. B - tenths of an inch. C - hundredths of an inch.

The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in. A - sixteenths of an inch. B - hundredths of an inch. C - tenths of an inch.

Threaded rivets (Rivnuts) are commonly used to . A - join two or more pieces of sheet metal where shear strength is desired. B - join two or more pieces of sheet metal where bearing strength is desired. C - attach parts or components with screws to sheet metal.

Cherrymax and Olympic-Lok rivets. A - may be installed with ordinary hand tools. B - utilize a pulling tool for installation. C - utilize a rivet gun, special rivet set, and bucking bar for installation.

Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the. A - possibility of causing delamination. B - difficulty in forming a proper shop head. C - increased possibility of fretting corrosion in the fastener.

Metal fasteners used with carbonlgraphite composite structures. A - must be constructed of high strength aluminumlithium alloy. B - must be constructed of material such as titanium or corrosion resistant steel. C - may be constructed of any of the metals commonly used in aircraft fasteners.

If a new safety belt is to be installed in an aircraft, the belt must conform to the strength requirements in which document?. A - TSO C22. B - FAR Part 39. C - STC 1282.

Select the alternative which best describes the function of the flute section of a twist drill. A - Forms the cutting edges of the drill point. B - Forms the area where the drill bit attaches to the drill motor. C - Prevents overheating of the drill point.

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

Shallow scratches in sheet metal may be repaired by. A - buffing. B - burnishing. C - stop drilling.

What should be the included angle of a twist drill for soft metals?. A 118°. B 90°. C 65°.

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. A - higher speed with less pressure applied to the drill. B - lower speed with less pressure applied to the drill. C - lower speed with more pressure applied to the drill.

A single lap sheet splice is to be used to repair a section of damaged aluminum skin. If a double row of 1/8-inch rivets is used, the minimum allowable overlap will be. A. 3/4, inch. B. 13/16, inch. C. 1/2, inch.

Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?. A - If rivets show no visible distortion, further investigation is unnecessary. B - If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction. C - If bearing failure has occurred, the rivet shanks will be joggled.

What is the minimum edge distance for aircraft rivets?. A - Three times the diameter of the rivet shank. B - Tho times the diameter of the rivet head. C - Two times the diameter of the rivet shank.

When drilling stainless steel, the drill used should have an included angle of. A - 140° and turn at a low speed. B - 118° and turn at a high speed. C - 90° and turn at a low speed.

What is the minimum spacing for a single row of aircraft rivets?. A - Three times the length of the rivet shank. B - Three times the diameter of the rivet shank. C - Tho times the diameter of the rivet shank.

(Refer to figure 1.) Which of the rivets shown will accurately fit the conical depression made by a 100" countersink?. A 3. B 2. C1.

Which is correct concerning the use of a file?. A - A smoother finish can be obtained by using a double cut file than by using a single cut file. B - Apply pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum. C - The terms "double cut" and "second cut" have the same meaning in reference to files.

What is one of the determining factors which permits machine countersinking when flush riveting?. A - Thickness of the material and rivet diameter are the same. B - Thickness of the material is greater than the thickness of the rivet head. C - Thickness of the material is less than the thickness of the rivet head.

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

Which procedure is correct when using a reamer to finish a drilled hole to the correct size?. A - Turn the reamer only in the cutting direction. B - Apply considerable pressure on the reamer when starting the cut and reduce the pressure when finishing the cut. C - Turn the reamer in the cutting direction when enlarging the hole and in the opposite direction to remove from the hole.

Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually. A - permitted only if the damage does not exceed 6 inches in any direction. B - not permitted. C - permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface.

Clad aluminum alloys are used in aircraft because they. A - are stronger than unclad aluminum alloys. B - are less subject to corrosion than uncoated aluminum alloys. C - can be heat treated much easier than the other forms of aluminum.

When straightening members made of 2024-T4, you should. A - straighten cold and anneal to remove stress. B - straighten cold and reinforce. C - apply heat to the inside of the bend.

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

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

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

When fabricating parts from Alclad 2024-T3 aluminum sheet stock,. A -bends should be made with a small radius to develop maximum strength. B - all bends must be 90" to the grain. C - all scratches, kinks, tool marks, nicks, etc., must be held to a minimum.

Rivet gauge, or transverse pitch is the distance between the. A - heads of rivets in the same row. B - centers of rivets in adjacent rows. C - centers of adjacent rivets in the same row.

Rivet pitch is the distance between the. A - centers of adjacent rivets in the same row. B - heads of rivets in the same row. C - centers of rivets in adjacent rows.

(Refer to figure 2.) Select the preferred drawing for proper countersinking. A-2. B-1. C - All are acceptable.

What is indicated by a black "smoky" residue streaming back from some of the rivets on an aircraft?. A - Fretting corrosion is occurring between the rivets and the skin. B - Exfoliation corrosion is occurring inside the structure. C - The rivets were excessively work hardened during installation.

The identifying marks on the heads of aluminum alloy rivets indicate the. A - degree of dimensional and process control observed during manufacture. B - specific alloy used in the manufacture of the rivets. C - head shape, shank size, material used, and specifications adhered to during manufacture.

When an MS20470D rivet is installed, its full shear strength is obtained. A - by the cold working of the rivet metal in forming a shop head. B - only after a period of age hardening. C - by heat treating just prior to being driven.

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

What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?. A - To retard age hardening. B - To relieve internal stresses. C - To accelerate age hardening.

Under certain conditions, type A rivets are not used because of their. A - low strength characteristics. B - tendency toward embrittlement when subjected to vibration. C - high alloy content.

A rivet set used to drive MS20470 rivets should. A - be nearly flat on the end, with a slight radius on the edge to prevent damage to the sheet being riveted. B - have a slightly greater radius than the rivet head. C - have the same radius as the rivet head.

Heat treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration. A - may be returned to refrigeration and used later without reheat treatment. B - must be reheat treated before use. C - must be discarded.

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

The primary alloying agent of 2024-T36 is indicated by the number. A - 20. B - 24. C - 2.

Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture?. A - 20. B - 17. C - 2.

A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet holes are drilled for 3132-inch rivets. The length of the rivets to be used will be. A - 5/16 inch. B - 1/4 inch. C - 1/8 inch.

Most rivets used in aircraft construction have. A - a raised dot. B - smooth heads without markings. C - dimples.

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

Which rivet may be used as received without further treatment?. A - 2117-T3. B - 2010-T3. C - 2024-T4.

(Refer to figure 3.) Which is the grip length of the flush rivet?. A - 2. B - 3. C - 1.

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

A sheet metal repair is to be made using two pieces of 0.0625-inch aluminum riveted together. All rivet holes are drilled for 118-inch rivets. The length of the rivets to be used will be. A - 5/16, inch. B - 3/16 inch. C - 5/32 inch.

Mild steel rivets are used for riveting. A - nickel steel parts. B - magnesium parts. C - steel parts.

A DD rivet is heat treated before use to. A - soften to facilitate riveting. B - harden and increase strength. C - relieve internal stresses.

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

The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to. A - one and one half times the rivet diameter plus .096 inch. B - three times the rivet diameter plus .096 inch. C - two times the rivet diameter plus .064 inch.

What is generally the best procedure to use when removing a solid shank rivet?. A - Drill to the base of the manufactured rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch. B - Drill through the manufactured head and shank with a drill one size smaller than the rivet and remove the rivet with a punch. C - Drill through the manufactured head and shank with a shank size drill and remove the rivet with a punch.

Joggles in removed rivet shanks would indicate partial. A - bearing failure. B - torsion failure. C - shear failure.

What type loads cause the most rivet failures?. A - Shear. B - Head. C - Bearing.

Which rivet is used for riveting magnesium alloy structures?. A - 5056 aluminum. B - Monel. C - Mild steel.

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

The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-inch and 0.064- inch aluminum sheet, drilled with a No. 30 drill, is. A - 1/4 inch. B - 7/6 inch. C - 5/16 inch.

(Refer to figure 4.) The length of flat A is. A. - 3.875 inches. B. - 3.937 inches. C. - 3.750 inches.

(Refer to figure 4.) The amount of material required to make the 90" bend is. A - 0.3717 inch. B - 0.3925 inch. C - 0.3436 inch.

(Refer to figure 5, page 2-14.) What is the length of flat A?. A - 3.9 inches. B - 3.7 inches. C - 3.8 inches.

(Refer to figure 5, page 2-14.) What is the flat layout dimension?. A - 6.6 inches. B - 7.0 inches. C - 6.8 inches.

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. A - started by tapping the aluminum lightly around the edges and gradually working down into the center. B - distributed evenly over the face of the aluminum at all times rather than being started at the edges or center. C - started by tapping the aluminum in the center until it touches the bottom of the mold and then working out in all directions.

A piece of flat stock that is to be bent to a closed angle of 15" must be bent through an angle of. A - 165". B - 105". C - 90".

When a piece of aluminum alloy is to be bent using a minimum radius for the type and thickness of material,. A - less pressure than usual should be applied with the movable (upper) clamping bar. B -the layout should be made so that the bend will be 90° to the grain of the sheet. C - the piece should be bent slowly to eliminate cracking.

The flat layout or blank length of a piece of metal from which a simple L shaped bracket 3 inches by 1 inch is to be bent depends upon the radius of the desired bend. The bracket which will require the greatest amount of material is one which has a bend radius of. A - 1/2, inch. B - 1/4, inch. C - 1/8 inch.

If it is necessary to compute a bend allowance problem and bend allowance tables are not available, the neutral axis of the bend can be. A - found by adding approximately one half of the stock thickness to the bend radius. B - represented by the actual length of the required material for the bend. C - found by subtracting the stock thickness from the bend radius.

Unless otherwise specified, the radius of a bend is the. A - radius of the neutral axis plus one half the thickness of the metal being formed. B - inside radius of the metal being formed. C - inside radius plus one half the thickness of the metal being formed.

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

The most important factors needed to make a flat pattern layout are. A - radius, thickness, and mold line. B - the lengths of the legs (flat sections). C - radius, thickness, and degree of bend.

A piece of sheet metal is bent to a certain radius. The curvature of the bend is referred to as the. A - bend radius. B - bend allowance. C - neutral line.

You can distinguish between aluminum and aluminum alloy by. A - testing with a 10 percent solution of caustic soda. B - filing the metal. C - testing with an acetic acid solution.

The purpose of a joggle is to. A - decrease the weight of the part and still retain the necessary strength. B - increase obstruction for a sheet or an extrusion. C - allow clearance for a sheet or an extrusion.

When bending metal, the material on the outside of the curve stretches while the material on the inside of the curve compresses. That part of the material which is not affected by either stress is the. A - mold line. B -bend tangent line. C - neutral line.

(Refer to figure 6.) Determine the dimensions of A, B, and C in the flat layout. Setback = 252 Bend allowance = .345. A - A= 1.252 B= 2.504 C= 1.752. B- A= .748 B= 2.252 C= 2.004. C - A= .748 B= 1.496 C= 1.248.

(Refer to figure 6.) What is dimension D? Setback = ,252 Bend allowance = .345. A - 3.841. B - 3.492. C - 4.182.

The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked. A - one radius from either bend tangent line. B - one-half radius from either bend tangent line. C - one radius from the bend tangent line that is placed under the brake.

(Refer to figure 7, page 2-18.) What is dimension F? Setback at D = .095 Setback at E = .068 Bend allowance at D = .I50 Bend allowance at E = ,112. A - 4.836. B - 5.738. C - 5.936.

On a sheet-metal fitting layout with a single bend, allow for stretching by. A - adding the setback to each leg. B - subtracting the setback from one leg. C - subtracting the setback from both legs.

The aluminum alloys used in aircraft construction are usually hardened by which method?. A - Heat treatment. B - Aging. C - Cold working.