Sheet metal structures FAA questions (A2)

The dimensions of an MS20430AD-4-8 rivets are

A- 1/8 inch in diameter and 1/2 inch long

Which rivet may be used as a received without further treatment?

A- 2117-T3

A sheet metal repair is to be made suing two pieces of 0.0625-inch aluminum riveted together. All rivet holes are drilled for 1/8 inch rivets. the length of the rivets to be used will be

A- 5/16 inch

Which rivet used for riveting magnesium alloy structures?

A- 5056 aluminum

A piece of sheet metal is bent to a certain radius. the curvature of the bend is referred to as the

A- Bend radius

What is generally the bets procedure to use when removing a solid shank rivet?

A- Drill to the base of the mnaufacuted rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch

What is indicated by a black "smoke" residue streaming back from some of the rivets on an aircraft?

A- Fretting corrosion is occurring between the rivets and the skin.

The aluminum alloys used in aircraft construction are usually hardened by which method?

A- Heat treatment

MS20426AD-6-5 indicates a countersunk rivet which has

A- an overall length of 5/16 inch

Rivet pitch is the distance between

A- centers of adjacent rivets in the same row

A factor which determines the minimum space between rivets is the

A- diameter of the rivets being used

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

Under certain conditions, type A rivets are not sued because of their

A- low strength characteristics

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

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.

The shop head of a rivet should be

A- one and one-half time the diameter of the rivet shank

you can distinguish between aluminum and aluminum alloy by

A- testing with a 10 percent solution of caustic soda

The general rule for finding the proper rivet diameter is

A- three times the thickness of the thickest sheet.

What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets?

A- to retard age hardening

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

The sight line on a sheet metal flat layout to be bend in a cornice or box is measure and marked

C- one radius from the bend tangent line that is placed under the brake.

Joggles in removed rivet shanks would indicate partial

C- shear failure

What type loads cause the most rivet failures?

A - Shear

What should the included angle of a twist drill for hard metal?

A- 118 degrees

When drilling stainless steel, the drill used should have an included angle of

A- 140 and turn at a low speed

A piece of flat stock that is to be bent to a closed angle of 15 degrees must be bent through an angle of

A- 165

Aircraft structural unite, such as spars, engine supports, etc., which have been build up from sheet metal, are normally

A- repairable, using approved methods

Which of the following need not be considered when determining the minimum rivet spacing?

A- rivet length

The Dzuz turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in

A- sixteenths of an inch.

A DD rivet is heat treated before use to

A- soften to facilitate riveting

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.

Which rivet is used for riveting nickel steel alloys?

B- Monel.

Cherrymax and Olympic-Lok rivets

B- utilize a pulling tool for installation.

(refer to figure 2 on page 2-14) Select the preferred drawing for proper countersinking

B- 1

A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet hols are drilled for 3/32 inch rivets. the length of the rivets to be used will be

B- 1/4 inch

when repairing puncture type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to

B- 100 times the thickess of the metal

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

B- 13/16 inch

(Refer to figure 3 on page 2-11) Which is the grip length of the flush rivet?

B- 3

(Refer to figure 5 on page 2-20) What is the length of A?

B- 3.7 inches

How many MS20470AD-4-6 rivets will be required to attach a 10x5 inch plate, using a single row of rivets, minimum edge distance and 4D spacing?

B- 56

What should be the included angle of a twist drill for soft metals?

B- 90 degrees

which is correct concerning the use of a file?

B- Apply pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum.

Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?

B- If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction

What is the minimum spacing of a single row of aircraft rivets?

B- Three times the diameter of the rivet shank

Clad aluminum alloys are used in aircraft because they

B- are less subject to corrosion than uncoated aluminum alloys

Shallow scratches in sheet metal may be repiared by

B- burnishing

Alloy 2117 rivets are heat treated

B- by the manufacturer and do not require heat treatment before being driven

Rivet gauge, or transverse pitch is the distance between the

B- centers of rivets and adjacent rows

A rivet is used to drive MS20470 rivets should

B- have a slightly greater radius than the rivet head.

Unless otherwise specified, the radius of a bend is the

B- inside radius of the metal being formed

Heat treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration

B- must be reheat treated before use.

A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the

B- number of lock collar grooves

When an MS20470D rivet is installed, its full shear strength is obtained

B- only after a period of age hardening

The identifying marks on the heads of aluminum ally rivets indicate the

B- specific alloy used in the manufacture of the rivets

When a piece of aluminum alloy is to be bent using a minimum radius for the type and thickness of material

B- the layout should be made so that the bend will be 90 degrees to the grain of the sheet

When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be

B- the shear strength of the riveted joint

What is one of the determining factors which permits machine countersinking when flush riveting?

B- thickness of the material is greater than the thickness of the rivet head.

(Refer to figure 1 on page 2-8) Which of the rivets shown will accurately fit the conical depression made by a 100 degree countersink?

C- 1

The flat layout or blank length of a piece of metal from which a simple L shaped bracket is 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

C- 1/8 inch

The primary alloying agent ins 2024-T36 is indicated by the number

C- 2

Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture?

C- 2

(Refer to figure 4 on page 2-19) The length of flat A is

C- 3.750 inches

(Refer to figure 6 on page 2-21) What is dimension D? Setback = .252 Bend Allowance = .345

C- 4.182

(Refer to figure 7 on page 2-22) What is dimension F? Setback at D = 0.95 Setback at E = .068 Bend allowance at D = .150 Bend allowance at E = .112

C- 5.936

The length of rivet to be chose when making structural repair that involves the joining of 0.032 inch and 0.064 inch aluminum sheet, drilled with a No. 30 drill, is

C- 5/16 inch

(Refer to figure 5 on page 2-20) What is the flat layout dimension?

C- 6.8 inches

(Refer to figure 6 on page 2-21) Determine the dimensions of A, B and C in the flat layout. Setback = .252; bend allowance = .354

C- A = .748; B = 1.496; C = 1.248

Which rivets should be selected to join two sheets of .032-inch aluminum?

C- MS20470AD-4-4

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

C- Neutral line.

When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?

C- Place a protective separator between areas of potential electrical difference.

When fabricating parts from Alclad 2024-T3 aluminum sheet stock

C- all scratches, kinks, tool marks, nicks, etc. must be held to a minimum

The purpose of a joggle is to

C- allow clearance for a sheet or an extrusion.

Threaded rivets (Rivnuts) are commonly used to

C- attach parts or components with screws to sheet metal.

the markings on the head of a Dzuz fastener identify the

C- body diameter, type of head, and length of the fastener

Most rivets used in aircraft construction have

C- dimples

The Dzuz turnlock fastener consists of a stud, grommet, and receptacle. the stud length is measured in

C- hundredths of an inch.

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

C- lower speed with more pressure applied to the drill

Repairs or splices invoving stringers on the lower surface of stressed skin metal wings are usually

C- permitted by are normally more critical in reference to strength in tension than similar repairs to the upper surface

Select the alternative which best describes the function of the flute section of the twist drill

C- prevents overheating of the drill point

Annealing of aluminum

C- removes stresses caused by forming

a well designed rivet joint will subject the rivets to

C- shear loads

Mild steel rivets are used for riveting

C- steel parts

On a sheet metal fitting layout with a single bend, allow for stretching by

C- subtracting the setback from both legs

One of the main advantages of Hi-Lock type fasteners over earlier generations is that

C- they can be installed with ordinary hand tools.

What is the minimum edge distance for aircraft rivets?

C- two times the diameter of the rivet shank