Sheet metal FAA Question

are less subject to corrosion than uncoated aluminum alloys.

Clad aluminum alloys are used in aircraft because they

must be reheat treated before use.

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

possibility of causing delamination.

Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the

56

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?

started by tapping the aluminum lightly around the edges and gradually working down into the center

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

Crazing

If an aircraft's transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be

found by adding approximately one-half of the stock thickness to the bend radius.

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

covered with a thin coat of wax.

If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be

shear failure.

Joggles in removed rivet shanks would indicate partial

an overall length of 5/16 inch

MS20426AD-6-5 indicates a countersunk rivet which has

they can be installed with ordinary hand tools.

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

permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface.

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

centers of rivets in adjacent rows.

Rivet gauge, or transverse pitch is the distance between the

Forms the cutting edges of the drill point.

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

burnishing

Shallow scratches in sheet metal may be repaired by

sixteenths of an inch.

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

hundredths of an inch.

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

Heat treatment.

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

1/8 inch

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

three times the thickness of the thickest sheet.

The general rule for finding the proper rivet diameter is

specific alloy used in the manufacture of the rivets.

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

A pulling tool

The installation of Cherrymax and Olympic-Lok rivets is accomplished by utilizing

be at least flame resistant.

Cabin upholstery materials installed in current standard category airplanes must

longerons and stringers

Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called

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

Parts fabricated from Alclad 2024-T3 aluminum sheet stock must have all

centers of adjacent rivets in the same row.

Rivet pitch is the distance between the

has a high strength to weight ratio.

Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction

1/8 inch in diameter and 1/2 inch long.

The dimensions of an MS20430AD-4-8 rivet are

radius, thickness, and degree of bend

The most important factors needed to make a flat pattern layout are

2

The primary alloying agent of 2024-T3 is indicated by the number

allow clearance for a sheet or an extrusion.

The purpose of a joggle is to

minimum radius of bend.

The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the

one and one-half times the diameter of the rivet shank.

The shop head of a rivet should be

low strength characteristics

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

inside radius of the metal being formed.

Unless otherwise specified, the radius of a bend is the

A specially modified twist drill.

What type of bit should be used to drill holes in Plexiglas?

the layout should be made so that the bend will be 90° to the grain of the sheet.

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

only after a period of age hardening

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

the grain is perpendicular to the skin.

When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that

neutral line.

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

lower speed with more pressure applied to the drill.

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

140° and turn at a low speed.

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

5.936

(Refer to question #8176 Figure 7.) What is dimension F? Setback at D = .095 Setback at E = .068 Bend allowance at D = .150 Bend allowance at E = .112

have a slightly greater radius than the rivet head.

A rivet set used to drive MS20470 rivets should

1/4 inch.

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

5/16 inch

A sheet metal repair is to be made using 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

13/16 inch.

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

shear loads.

A well-designed rivet joint will subject the rivets to

A 2023 T3 Alclad Copper as main alloying ingredient 23 is alloy designator T3 Heat treated, aged, and cold worked

A 2023 T3

soften to facilitate riveting

A DD rivet is heat treated before use to

thermoplastic

A category of plastic material that is capable of softening or flowing when reheated is described as a

diameter of the rivets being used.

A factor which determines the minimum space between rivets is the

number of locking collar grooves.

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

165°.

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

bend radius.

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

1 inch in diameter

A potted compound repair on honeycomb can usually be made on damages less than

repairable, using approved methods

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

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

Alloy 2117 rivets are heat treated

one and one-half times the rivet diameter plus .096 inch.

The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to

5/16 inch.

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

body diameter, type of head, and length of the fastener.

The markings on the head of a Dzus fastener identify the

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

The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked

attach parts or components with screws to sheet metal.

Threaded rivets (Rivnuts) are commonly used to

Hi Lok Huck Bolts Blind Rivets Anything that is not your average fastener

What are the special types of fasteners?

Rivet Bolt

What are the types of normal fasteners?

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

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

Fretting corrosion is occurring between the rivets and the skin

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

Thickness of the material is greater than the thickness of the rivet head.

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

The minimum edge distance for the single row is equal to that for the multiple row.

What is the minimum edge distance allowed for aluminum alloy single lap sheet splices containing a single row of rivets as compared to a joint with multiple rows, all rivets being equal in diameter?

Two times the diameter of the rivet shank.

What is the minimum edge distance for aircraft rivets?

Three times the diameter of the rivet shank.

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

To retard age hardening.

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

Prime the repair with a corrosion inhibitor and seal from the atmosphere.

What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?

118°

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

90°.

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

Shear

What type loads cause the most rivet failures

tightened to a firm fit, then backed off one full turn.

When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and self-locking nuts, the nuts should be

Water only.

When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?

the shear strength of the riveted joint.

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

100 times the thickness of the metal.

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

Place a protective separator between areas of potential electrical difference.

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

straighten cold and reinforce

When straightening members made of 2024-T4, you should

Zinc chloride will have no effect

Which is an identifying characteristic of acrylic plastics?

When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided.

Which is considered good practice concerning the installation of acrylic plastics?

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

Which is correct concerning the use of a file?

Rivet length.

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

2

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

Longerons and stringers.

Which part(s) of a semi-monocoque fuselage prevent(s) tension and compression from bending the fuselage?

Turn the reamer only in the cutting direction

Which procedure is correct when using a reamer to finish a drilled hole to the correct size?

5056 aluminum.

Which rivet is used for riveting magnesium alloy structures?

Monel

Which rivet is used for riveting nickel-steel alloys?

2117-T3.

Which rivet may be used as received without further treatment?

MS20470AD-4-4

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

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

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

testing with a 10 percent solution of caustic soda.

You can distinguish between aluminum and aluminum alloy by

must be constructed of material such as titanium or corrosion resistant steel.

Metal fasteners used with carbon/graphite composite structures

steel parts.

Mild steel rivets are used for riveting

dimples

Most rivets used in aircraft construction have

subtracting the setback from both legs.

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