Quiz 1 Flashcards by Alea Klepsteen

The purpose of wing slats is to?

Reduce stalling speed

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The angle of incidence of an airplane…

Does not change in flight

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When subsonic air flows into a converging duct, its density…

Remains the same

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An airplane has a positive longitudinal static stability when its center of gravity is ________ the center of the lift

Ahead

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In order to tilt the rotor disc of a helicopter forward, the pitch of the _______ blade is increased

Retreating

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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

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The shop head of a rivet should be

One and one half times the diameter of the river shank

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

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.

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Well designed rivet joint will subject the rivets to

Shear loads

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A rivet set used to drive MS20470 rivets should

Have slightly greater radius than the rivet head

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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

Use short strips of fiberglass in the bonded repair

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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

MEK (methyl ethyl ketone)

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

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The coefficient of expansion of most plastic enclosure material is

Greater than both steel and aluminum

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The preferred way to make permanent repairs on composites is by

Laminating on new repair plies

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Wing dihedral, a rigging consideration of most airplanes of conventional design, contributes mostly to stability of the airplane about its

Longitudinal axis

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Rigging and alignment checks should not be undertaken in the open, however if this cannot be avoided the aircraft should be positioned

With the nose into the wind

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Washing-in the left wing of the monoplane for purpose of rigging corrections after flight test, will have what effect on the lift and drag of that wing

Both drag and lift will increase due to in erased angle of attack

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Movement about the longitudinal axis in a helicopter is effected by movement of the

Cyclic pitch control

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With which system is differential control associated

Aileron

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

Minimum radius of bend

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

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

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The shop head of a rivet should be

One and one half times the diameter of the rivet shank

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What type loads cause the most rivet failures

Shear

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The center pressure remains in essentially the same location as the angle of attack changes on a/an_______ airfoil

Symmetrical

The dihedral angle of a wing may be measured by placing a straightedge and level protractor on the

Front spar

The correct dihedral angle can be determined by

Using a dihedral board and bubble level along the front spar of each wing

When subsonic air flows into a converging duct, it's density

Remains the same

What physical factors are involved in the aspect ratio of airplane wings

Span and chord

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

Three times the diameter of the rivet shank

Which rivet is used for riveting nickel- steel alloys

Monel

Acetylene at a line pressure above 15 psi is

Dangerously unstable

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

Radius, thickness, and degree of bend

A very thin and pointed tip on a soldering copper is undesirable because it will

Cool too rapidly

Which properly applied finish topcoat is the most durable and chemical resistant

Polyurethane

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

Requires the replacement of the damage core and facing

Which is an identifying characteristics of acrylic plastics

Zinc chloride will have no effect

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

Has a high strength to weight ratio

As the angle of attack of an airfoil increases, the center of pressure will

Move toward the leading edge

If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right, the left aileron will move

Down and the elevator will move down

The purpose of spring tabs or servo tabs is to

Assist the pilot in moving the control surfaces

Stability about the axis which runs parallel to the line of flight is referred to as

Lateral stability

The elevators of a conventional airplane are used to provide rotation about the

Lateral axis

Which statement best describes magnesium welding

Filler rod should be the same composition as base metal

Engine mount members should preferably be repaired by using a

Larger diameter tube with fish mouth and rosette welds

The monocoque fuselage relies largely on the strength of

Skin or covering

The installation of Cherrymax and Olympic lok rivets is accomplished by utilizing

A pulling tool

In gas welding, the amount of heat applied to the material being welded is controlled by the

Size of the tip opening

Annealing of aluminum

Removes stresses caused by forming

Filing or grinding a weld base

Reduces the strength of the joint

Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair

AC 43.13-1B

Cylinders used to transport and store acetylene

Contain acetone

If the right wing of a monoplane is improperly rigged to a greater angle of incidence than designated in the manufacture's specifications, it will cause the

Airplane to be off balance both laterally and directionally

The aerodynamic load on the tail of a longitudinally stable airplane acts

Downward

Vortex generators mounted on the empennage of an airplane improve flight characteristics at _______ speed

Low

The basic forces that act on an aircraft in flight are

Thrust, drag, weight, and lift

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

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

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

13/16 inch

The most important consideration when selecting welding rod is

Material compatibility

A resurfaced soldering iron cannot be used effectively until after the working face has been

Tinned

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

Thermoplastic

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

60:40

What is likely to occur if hydrated wash primer is applied to unpainted aluminum and then about 30-40 minutes later a finish topcoat, when the humidity is low

A glossy, blush-free finish

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

Has a high strength to weight ratio

Placing a piece of cloth around a stainless steel control cable and running it back and forth over the length of the cable is generally a satisfactory method of

Inspecting wires

An airplane that had a tendency to gradually increase a pitching moment that has been set into motion has

Poor longitudinal stability

The purpose in checking main rotor blade tracking is to determine the

Relative position of the blades during rotation

The shielding gases generally used in the Gas Tungsten Arc (GTA) welding of aluminum consist of

Helium or argon, or a mixture of helium and argon

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

Radius of bend

Where should the flux be applied when oxyacetylene welding aluminum

Painted on the surface to be welded and applied to the welding

In cases of elongated boltholes in a wood spar or cracks in the vicinity of boltholes

A new section of spar should be spliced in or the spar replaced entirely

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

Warp clock or compass

When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by using

Circular or elliptical patches