2A753 Volume 1 Aircraft Structural Journeyman

A scriber is a layout tool commonly used to mark cut lines on metal surfaces. It is a pointed tool with a sharp tip that can be used to scratch or etch lines onto the metal. By using a scriber, precise lines can be marked, allowing for accurate cutting and shaping of the metal. Dividers, prick punch, and layout punch are also layout tools, but they are not specifically designed for marking cut lines on metal surfaces.

Angles less than 90° are defined as acute.

Malleability refers to the ability of a metal to be hammered, rolled, or pressed into various shapes without breaking. It is a property that allows metals to be easily formed into different shapes and sizes. Elasticity refers to the ability of a material to return to its original shape after being deformed, while ductility refers to the ability of a material to be stretched into a wire. Density, on the other hand, is a measure of how much mass is contained in a given volume of a substance. Therefore, the correct answer for this question is malleability.

A depth gauge is used to determine the depth of a corrosion pit. It is a measuring tool specifically designed to measure the depth of small holes or depressions. By placing the depth gauge into the pit, the user can accurately measure the depth of the corrosion, allowing for proper assessment and potential repair of the affected area. Magnifying glass, straight edge, and scribe are not suitable for measuring the depth of a corrosion pit.

The relationship between the strength of a material and its weight per cubic inch is commonly referred to as the strength/weight ratio. This ratio is used to compare the strength of different materials while taking into account their weight, allowing for a more accurate assessment of their performance. It is a crucial factor in various industries, such as aerospace and automotive, where lightweight yet strong materials are highly desirable. The strength/weight ratio helps engineers and designers determine the most suitable material for a specific application, balancing strength and weight considerations.

The amount of metal needed to form a bend is called the bend allowance. This term refers to the length of material that is required to create a bend in a metal sheet or plate. It takes into account factors such as the thickness of the material, the angle of the bend, and the radius of the bend. The bend allowance is an important calculation in metal fabrication and is used to determine the overall dimensions and layout of a bent piece of metal.

Aramid/epoxy materials are typically identified by their yellow-gold color. This color is often used to distinguish these materials from other types of composites or materials. The yellow-gold color is a visual indicator that helps in identifying and differentiating aramid/epoxy materials from others, making it easier for technicians and engineers to work with these specific materials.

A red X on an Air Force Technical Order (AFTO) Form 244, Industrial/Support Equipment Record, denotes an unsafe condition. This means that the equipment has a defect or issue that makes it unsafe to use. The red X serves as a visual indicator to alert personnel that the equipment should not be used until the issue is resolved.

The flutes on a twist drill are necessary because they provide a means of chip removal. As the drill rotates, the flutes help to channel the chips out of the hole being drilled, preventing them from clogging the drill bit and hindering the drilling process. This allows for efficient drilling and helps to maintain the quality of the drilled hole.

A throat-less lever shear can cut sheet metal of unlimited length or width because it does not have a throat or gap between the blades. This allows the sheet metal to be fed through the shear without any limitations on its size. The absence of a throat also provides greater flexibility and maneuverability when cutting sheet metal, making it an ideal choice for cutting large or irregularly shaped pieces.

5052 is the correct answer because it is an aluminum alloy that offers a good balance between strength and workability. It has high strength compared to other alloys while still being easily workable, making it suitable for various applications. The other options, 1000, 1100, and 3003, may have different strengths and workability properties, but they are not specifically known for being high in strength without a substantial loss in workability.

The unit of measure used with a scale is the gram. A gram is a metric unit of weight or mass, commonly used for measuring small objects or quantities. It is a more precise unit compared to pounds, ounces, or kilograms, which are used for larger or heavier objects. Therefore, when using a scale, the most appropriate unit of measure is the gram.

The best file to use on a concave surface is a half-round file. This type of file has a curved surface with one flat side and one rounded side, allowing it to conform to the shape of the concave surface. The rounded side of the file helps to remove material evenly and smoothly, while the flat side can be used for finishing and smoothing out any rough edges. Using a half-round file ensures that the file will make contact with the entire concave surface, resulting in a more accurate and even filing process.

Shear strength is the correct answer because it refers to the metal property that defines its resistance to a cutting action, similar to the cutting done by a pair of scissors. Shear strength measures the ability of a material to withstand forces that are applied parallel or tangential to its surface, causing it to deform or break. In the context of the question, shear strength accurately describes the property that determines a metal's resistance to cutting.

When stretching or shrinking, repeating the strokes too long in one spot can cause the edge of the flanges to crack and split. This happens because applying excessive force in a localized area for an extended period of time can exceed the material's ability to withstand the stress, leading to the formation of cracks and splits. It is important to evenly distribute the stretching or shrinking strokes to prevent concentrated stress on a single spot.

Form 244, Industrial/Support Equipment Record, is used to document equipment maintenance in the Air Force. This form is specifically designed for industrial and support equipment, allowing technicians to record and track maintenance activities, repairs, inspections, and other relevant information. It helps in maintaining accurate and up-to-date records of equipment maintenance, ensuring proper documentation and traceability of maintenance actions.

Cast iron is the correct answer because it is a type of iron-carbon alloy that contains a high amount of carbon (typically between 2-4%). This high carbon content gives cast iron its characteristic hardness and brittleness. Since cast iron is primarily made up of iron, it is considered a ferrous metal. Zinc, gold, and silver are not ferrous metals as they do not primarily consist of iron.

To use the job selector dial on a contour metal cutting saw, you need to know the material composition and thickness. This is because different materials and thicknesses require different cutting settings and blade types. The job selector dial allows you to choose the appropriate settings for the specific material and thickness you are working with, ensuring optimal cutting performance and accuracy.

Shrinking is the hand forming operation that refers to the reduction of an area of a piece of metal. This process involves applying pressure or force to a specific area of the metal, causing it to contract and reduce in size. This can be done using various tools and techniques, such as hammering or using a shrinking disc. Shrinking is commonly used in metalworking to shape and manipulate metal pieces, particularly when creating curves or contours. It allows for precise control over the metal's shape and can be used to achieve desired dimensions and aesthetics.

A thin line having alternating and evenly spaced long and short dashes is known as a center line. This type of line is commonly used to indicate the center of an object or to divide it into two equal parts. It helps in providing a visual reference for symmetrical alignment or positioning.

When using a micro-shaver, it is set .002" above the skin. This means that the shaver is positioned at a height of two-thousandths of an inch above the surface of the skin. This small distance allows for a precise and close shave without causing any cuts or irritation to the skin.

When multiplying fractions, you multiply the numerators together and the denominators together. In this case, multiplying 5/6 by 3/5 gives us (5*3)/(6*5) = 15/30. However, this fraction can be simplified by dividing both the numerator and denominator by their greatest common divisor, which is 15. So, 15/30 simplifies to 1/2.

A laminated fiberglass assembly consists of two or more layers of fiberglass cloth that are bonded together using heat and pressure. This process helps to create a stronger and more durable material. The layers of fiberglass cloth are stacked on top of each other and then heated, causing the resin in the cloth to melt and bond the layers together. This results in a solid and rigid structure that is commonly used in various applications such as construction, automotive, and aerospace industries.

The correct answer is "Blueprints are another name for mechanical drawings." This statement suggests that blueprints and mechanical drawings are essentially the same thing, just referred to by different names. It implies that the terms "blueprints" and "mechanical drawings" can be used interchangeably to describe the same type of technical drawings used in engineering and construction.

When adding additional crimps to shrink a form angle, they should be placed between the original crimps. This is because the original crimps are already in place and serve as the starting point for the angle. By adding the additional crimps between the original ones, the angle can be further tightened and secured. Placing the crimps in the location of the original ones or on the ends of the formed angle would not effectively shrink the angle.

To ensure a reciprocating saw is cutting properly, it is important to select a blade with a pitch where at least two teeth will cut at all times. This ensures a consistent and efficient cutting motion, as having multiple teeth engaged in the cutting process provides better stability and control. If only one tooth is cutting at a time, it can cause the blade to wander and result in an uneven or jagged cut. Therefore, selecting a blade with the appropriate pitch helps to maintain a smooth and accurate cutting action.

The machine capacity of a rotary punch is found on the front of each die holder. This means that the information about the maximum capacity or capability of the punch machine can be found on the front side of the die holder. It is important to know this capacity in order to ensure that the machine is used within its limits and to prevent any damage or malfunctioning. The capacity may be indicated in terms of the maximum thickness or size of the material that can be punched using the machine.

The transition area of a metal-bonded honeycomb panel refers to the area between the flat section of the panel and the panel attachment area. This is the region where the panel transitions from the flat surface to the area where it is attached or connected to another component.

A single-cut file is used to sharpen the blades of cutting tools. This type of file has one set of parallel teeth that run diagonally across the file's surface. The teeth are designed to remove material in one direction only, making it ideal for sharpening the edges of cutting tools. The single-cut file provides a smooth and precise sharpening action, ensuring that the blades of cutting tools are sharpened effectively.

The included angle of a center punch should be 90 degrees. This angle is necessary to create an indentation on a material with precision and accuracy. A 90-degree angle ensures that the punch will create a perpendicular mark on the surface, allowing for easier drilling or further machining operations. This angle also helps prevent the punch from slipping or wandering off the desired location.

Magnesium is the world's lightest structural metal. It has a low density, making it lightweight and easy to handle. It is commonly used in industries such as aerospace and automotive due to its excellent strength-to-weight ratio. Magnesium alloys are also known for their high corrosion resistance and good machinability. Therefore, magnesium is the correct answer for the lightest structural metal.

When the bar folder does not operate freely, the most likely adjustment that needs to be made is to the thickness. This could involve checking and adjusting the settings on the machine to ensure that it is properly calibrated for the thickness of the material being folded. It could also involve inspecting the material itself to see if there are any irregularities or obstructions that are preventing the bar folder from operating smoothly. By addressing the thickness, the bar folder should be able to operate freely and efficiently.

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6061 is the correct answer because it is a heat-treatable aluminum alloy that offers excellent weldability. This alloy contains magnesium and silicon, which enhances its strength and makes it easier to weld. It is commonly used in various industries, including aerospace, automotive, and construction, where weldability is a crucial factor. 2024 and 2025 are also heat-treatable alloys, but they are not as weldable as 6061. 5053, on the other hand, is not a heat-treatable alloy and does not offer the same level of weldability as 6061.

Tinner's snips are a type of metal cutting snips that have a straight blade. These snips are commonly used by tinners or sheet metal workers for cutting straight lines in metal sheets. The straight blade allows for precise and clean cuts, making it ideal for their specific tasks. Other types of snips, such as offset, curved, and aviation snips, have different blade shapes and are used for different cutting purposes.

Silicon carbide is the correct answer for grinding aluminum using a bench grinder. Silicon carbide is a type of abrasive material that is harder than aluminum oxide, making it suitable for grinding softer materials like aluminum. It is also less likely to cause clogging or glazing of the grinding wheel, which can occur when using other types of abrasive materials. Therefore, silicon carbide is the preferred choice for grinding aluminum on a bench grinder.

To locate a specific point on a blueprint, zone numbers are used. Zone numbers are typically marked on blueprints to divide the area into different sections or zones. These numbers help in identifying the specific area or zone where the point is located, making it easier to locate and reference on the blueprint.

The largest twist drill that the chuck on a hand drill can normally accommodate is 1/4". This means that the chuck can hold drill bits with a maximum diameter of 1/4 inch.

A metal-bonded honeycomb panel is constructed by bonding a core between two metal facings. This means that there is a layer of metal on both sides of the core, providing strength and stability to the panel. The core is typically made of a lightweight material such as aluminum or composite, and it is bonded securely to the metal facings. This construction method is commonly used in aerospace and construction industries to create lightweight yet strong panels for various applications.

Composite materials are known for their ability to resist fatigue and corrosion. This means that they can withstand repeated stress and exposure to harsh environments without deteriorating. This quality makes them highly durable and long-lasting, reducing the need for frequent repairs or replacements. Additionally, their resistance to corrosion ensures that they can be used in various applications, including those involving exposure to moisture or chemicals. Overall, the fatigue and corrosion resistance qualities of composite materials make them a desirable choice for many industries.

The longest horizontal dimension that is represented at right angles to the length on a plane surface drawing is the width. This is because width refers to the measurement of something from side to side, and in a plane surface drawing, the width represents the longest horizontal dimension. Depth refers to the measurement of something from top to bottom, distance refers to the measurement of the space between two points, and projection refers to the representation of an object on a surface.

Single view drawings are used to manufacture objects using very thin, flat metal. This type of drawing provides a detailed representation of the object from a single perspective, including all necessary dimensions, measurements, and specifications. It allows the manufacturer to accurately understand and produce the object without the need for multiple views or additional drawings.

By setting the back roller at an angle, it allows the metal to be fed through the slip roll former in a conical shape. The angle of the back roller determines the angle at which the metal is bent, resulting in the desired conical shape. This method is effective in forming conical shapes because it allows for precise control over the bending process.

A nibbler is the correct answer because it is not suitable for cutting magnesium alloy sheet metal. Nibblers are typically used for cutting thin materials like sheet metal, but magnesium alloy is a soft and flammable material that can cause the nibbler to overheat and potentially ignite the metal. Therefore, using a nibbler to cut magnesium alloy sheet metal is unsafe and should be avoided.

To show three dimensions on a drawing, it is usually necessary to show at least two views. This is because a single view can only depict two dimensions, such as length and width. By showing two views, additional information about the third dimension, such as depth or height, can be conveyed. This allows for a more accurate representation of the object or structure being depicted. Additional views beyond two may be required for more complex or detailed drawings, but at a minimum, two views are necessary to show three dimensions.

A lower grit number indicates a coarser abrasive sheet or emery paper. Therefore, 120 grit is the coarsest option among the given choices. It would be suitable for blending out long, deep scratches on titanium as it provides more aggressive abrasion compared to higher grit numbers.

To properly remove oxidation from the bare metal of a machine surface, a grit of 400 sandpaper should be used. This grit is considered fine and is suitable for gently removing the oxidation without causing damage to the metal surface. Using a coarser grit may be too abrasive and result in scratches or further damage to the metal, while a finer grit may not be effective enough to remove the oxidation. Therefore, 400 grit sandpaper is the appropriate choice for this task.

If the material is not held flat against the face of the form during the bumping process, it will buckle. This means that the material will bend or fold out of shape, creating a noticeable bulge or wave-like appearance. This can happen when there is not enough pressure or support applied to the material, causing it to warp or deform. Buckling can affect the overall quality and appearance of the material, making it important to ensure that it is held flat during the bumping process.

The correct answer is the military specification number on the part. This means that the transparent plastics used on Air Force aircraft are identified by the specific military specification number assigned to them. This number serves as a standard for the quality and performance requirements of the plastic material used in the aircraft. It ensures that the plastic meets the necessary specifications and is suitable for use in the aircraft.

Chromium is chosen for its corrosion resistance and hardness. It forms a protective oxide layer on the surface, which prevents the steel from corroding. Additionally, chromium improves the hardness of the steel, making it more resistant to wear and deformation. Therefore, chromium is the ideal choice for applications where corrosion resistance and hardness are important factors.