Airframe Part 2

A well-designed rivet joint will subject the rivets to

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

Alloy 2117 rivets are heat treated

The general rule for finding the proper rivet diameter is

The shop head of a rivet should be

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

The markings on the head of a Dzus fastener identify the

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

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

Threaded rivets (Rivnuts) are commonly used to

Cherrymax and Olympic-Lok rivets

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

Metal fasteners used with carbon/graphite composite structures

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

(1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure.

Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water?
2. X-ray.
3. Backlighting.

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

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

One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to

Composite inspections conducted by means of acoustic emission monitoring

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

One method of inspecting a laminated fiberglass structure that has been subjected to damage is to

When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate

How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels?

2. Improved strength to weight ratio.
3. Less density
4. Lower stress concentrations

The length of time that a catalyzed resin will remain in a workable state is called the

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

The classification for high tensile strength fiberglass used in aircraft structures is

Which is an identifying characteristic of acrylic plastics?

Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying

The classification for fiberglass reinforcement material that has high resistivity and is the most common is

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

Composite fabric material is considered to be the strongest in what direction?

What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?

The strength and stiffness of a properly constructed composite buildup depends primarily on

Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?

What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?

Proper pre-preg composite lay-up curing is generally accomplished by
1. applying external heat.
4. applying pressure.

When repairing large, flat surfaces with polyester resins, warping of the surface is likely to occur. One method of reducing the amount of warpage is to

When making repairs to fiberglass, cleaning of the area to be repaired is essential for a good bond. The final cleaning should be made using

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

Fiberglass laminate damage not exceeding the first layer or ply can be repaired by

Fiberglass damage that extends completely through a laminated sandwich structure

Fiberglass laminate damage that extends completely through one facing and into the core

Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in

The preferred way to make permanent repairs on composites is by

Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels?

2. Flox.
3. Chopped fibers.

The part of a replacement honeycomb core that must line up with the adjacent original is the

Which of the following are generally characteristic of aramid fiber (Kevlar) composites?
1. High tensile strength.
2. Flexibility.

Which of the following are generally characteristic of carbon/graphite fiber composites?
2. Stiffness.
3. High compressive strength.
4. Corrosive effect in contact with aluminum.

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

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

If a new safety belt is to be installed in an aircraft, the belt must conform to the strength requirements in which document?

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

The coefficient of expansion of most plastic enclosure materials is

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

Cabin upholstery materials installed in current standard category airplanes must

What is the most common method of cementing transparent plastics?

When holes are drilled completely through Plexiglas, a

What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?

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

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?

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

Shallow scratches in sheet metal may be repaired by

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

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 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

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

What is the minimum edge distance for aircraft rivets?

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

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

(Refer to Figure 1.) Which of the rivets shown will accurately fit the conical depression made by a 100° countersink?

Which is correct concerning the use of a file?

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

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

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

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

When straightening members made of 2024-T4, you should

Clad aluminum alloys are used in aircraft because they

Which statement is true regarding a cantilever wing?

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

A factor which determines the minimum space between rivets is the

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

When fabricating parts from Alclad 2024-T3 aluminum sheet stock,

The monocoque fuselage relies largely on the strength of

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

Rivet gauge, or transverse pitch is the distance between the

Rivet pitch is the distance between the

(Refer to Figure 2.) Select the preferred drawing for proper countersinking.

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

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

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

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

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

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

A rivet set used to drive MS20470 rivets should

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

The dimensions of an MS20430AD-4-8 rivet are

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

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

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

Most rivets used in aircraft construction have

MS20426AD-6-5 indicates a countersunk rivet which has

Which rivet may be used as received without further treatment?

(Refer to Figure 3.) Which is the grip length of the flush rivet?

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

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

Mild steel rivets are used for riveting

A DD rivet is heat treated before use to

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

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

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

Joggles in removed rivet shanks would indicate partial

What type loads cause the most rivet failures?

Which rivet is used for riveting magnesium alloy structures?

Which rivet is used for riveting nickel-steel alloys?

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

(Refer to Figure 4.) The length of flat A is

(Refer to Figure 4.) The amount of material required to make the 90° bend is

(Refer to Figure 5.) What is the length of flat A?

(Refer to Figure 5.) What is the flat layout dimension?

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

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

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

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

Unless otherwise specified, the radius of a bend is the

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

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

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

You can distinguish between aluminum and aluminum alloy by

The purpose of a joggle is to

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

(Refer to Figure 6.) Determine the dimensions of A, B, and C in the flat layout.Setback = .252Bend allowance = .345

(Refer to Figure 6.) What is dimension D?Setback = .252Bend allowance = .345

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

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

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

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