2A753 Volume 2 Aircraft Structural Journeyman

If you hold a spray gun too close to the surface during painting operations, the paint coating will experience runs and sags. This is because holding the spray gun too close results in an excessive amount of paint being applied to the surface, causing it to drip and create uneven areas. This can lead to an unattractive finish and may require additional work to fix the runs and sags.

Material data safety sheets (MSDS) contain important information about the hazards, handling, and storage of materials. Making them available to everyone ensures that all individuals in the workplace have access to this crucial information. This promotes a safe working environment by allowing everyone to be aware of the potential risks associated with the materials they may come into contact with. By providing MSDS to everyone, it ensures that all employees, regardless of their position or level of responsibility, have the necessary information to handle materials safely.

The paint edges around the chemically stripped areas are feathered in order to ensure a smooth, overlapping transition between the old and new paint surfaces. Feathering the edges helps to blend the new paint with the existing paint, creating a seamless finish without any visible lines or edges. This technique is commonly used in automotive painting and other applications where a professional and high-quality appearance is desired.

Isopropyl alcohol is used to wipe down the aircraft surface before applying rain erosion resistant tape. This is because isopropyl alcohol is a commonly used solvent that effectively removes dirt, oil, and other contaminants from surfaces. By using isopropyl alcohol to clean the aircraft surface, it ensures that the tape will adhere properly and provide maximum protection against rain erosion. Ethylene glycol, aliphatic naptha, and methyl ethyl ketone are not typically used for this purpose.

When using parallel strokes with a spray gun, it is important for the spray pattern to overlap the previous stroke. This helps to ensure an even and consistent coverage of the surface being sprayed. By overlapping 50 percent of the previous stroke, the spray gun operator can achieve a balanced and uniform application of the paint or coating.

Before wearing a respirator with a tight-fitting face-piece, it is necessary to be fit tested with the same make, model, and style of respirator that will be used in the workplace. This ensures that the respirator fits properly and provides an effective seal. Thoroughly cleaning and disinfecting the respirator, inspecting for damaged parts, and ensuring that no facial hair comes between the sealing surface of the face-piece are important steps for maintaining the respirator's functionality, but they are not specifically required before wearing it.

A respirator should be cleaned and disinfected at the end of each day in which it is used to ensure that it remains sanitary and effective. Cleaning and disinfecting the respirator regularly helps to remove any contaminants or pathogens that may have accumulated on the surface during use. This practice is important to maintain the respiratory health and safety of the user and to prevent the spread of any potential infections.

Inadequate surface preparation is the most common cause of coating failure. When the surface is not properly prepared before applying the coating, it can lead to poor adhesion and bonding between the coating and the substrate. This can result in the coating peeling, blistering, or cracking over time. Proper surface preparation involves cleaning, removing contaminants, and ensuring the surface is smooth and free from any defects or imperfections.

When coating materials become jelled or lumpy, it indicates that they are no longer usable. These changes in texture can affect the quality and appearance of the coating, so it is best to discard them immediately. Using jelled or lumpy coating materials can result in an uneven application and an unsatisfactory finish. Therefore, it is important to ensure that the coating materials are in a smooth and consistent state before using them.

The pH scale is used to measure the strength of an electrolyte. The pH scale measures the concentration of hydrogen ions in a solution, which determines its acidity or alkalinity. A lower pH value indicates a higher concentration of hydrogen ions and a stronger electrolyte, while a higher pH value indicates a lower concentration of hydrogen ions and a weaker electrolyte. Therefore, the potential of hydrogen (pH) is the correct scale to measure the strength of an electrolyte.

The correct answer is "prior to use." When using the plastic media blasting (PMB) cabinet blaster, it is important to check the media level before starting to ensure that there is enough media for the blasting process. This ensures that the blaster will work effectively and efficiently. Checking the media level during use, immediately after use, or 5-10 minutes after use would not be as useful as checking it prior to use.

Chemical paint remover is typically mixed immediately before use to ensure its effectiveness. Mixing it too far in advance can cause the chemicals to lose their potency or evaporate, rendering the paint remover less effective. Mixing it closer to the time of use allows for maximum chemical activity and ensures that it will work efficiently to remove the paint.

The correct answer is "type of organic finish system to be removed." When it comes to choosing a chemical remover, the type of organic finish system plays a crucial role. Different types of organic finishes require different chemical removers for effective removal. For example, a remover suitable for removing paint may not be suitable for removing varnish. Therefore, understanding the type of organic finish system is essential in determining the appropriate chemical remover to be used.

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Certain metals have the ability to become electrochemically inactive or passive under specific conditions. This is due to the formation of oxide films on their surface. These oxide films act as a protective layer, preventing further corrosion or reaction of the metal with its environment. This phenomenon is commonly observed in metals like aluminum, stainless steel, and titanium, where the oxide films provide excellent corrosion resistance and enhance the durability of the material. Therefore, the correct answer is oxide films.

Air Force publications are divided into two categories: directive and non-directive. Directive publications provide specific guidance and instructions on how to carry out tasks and procedures within the Air Force. They are authoritative and binding. Non-directive publications, on the other hand, provide information, guidance, and recommendations, but they are not binding. They may include technical manuals, handbooks, and informational materials that support the operations of the Air Force.

Water entrapment areas are areas where water can accumulate and pose a risk to safety. Inspecting these areas daily is important to ensure that there are no hazards or potential dangers present. Regular inspections allow for any issues to be identified and addressed promptly, reducing the risk of accidents or injuries. By inspecting water entrapment areas daily, any potential problems can be detected early on and appropriate measures can be taken to maintain a safe environment.

Corrosion preventive compounds (CPC) are categorized into water displacing and non-water displacing. Water displacing CPCs are designed to displace moisture and create a protective barrier on metal surfaces, preventing corrosion. Non-water displacing CPCs, on the other hand, do not displace moisture and instead form a protective film on the metal surface to prevent corrosion. This categorization is based on the different mechanisms by which CPCs prevent corrosion and their ability to displace water.

Starting the sander before it touches the metal allows the user to gradually apply pressure and control the sanding process. This prevents the sander from digging into the metal and causing damage. By starting the sander first, the user can ensure a smooth and controlled sanding motion, minimizing the risk of gouging or scratching the metal surface.

The correct answer is room temperature because using a touch-up pen paint applicator pen at room temperature ensures that the paint flows smoothly and evenly. Extreme temperatures can affect the viscosity of the paint, making it too thick or too thin, which can result in an uneven application. Therefore, it is important to mix and use the touch-up pen paint applicator pen at room temperature to achieve the desired results.

Before using abrasive blasting to remove corrosion, it is important to clean any oil, grease, or other soils from surfaces. This step ensures that the abrasive blasting process is effective in removing the corrosion and prevents any contaminants from interfering with the process. By cleaning the surfaces beforehand, the abrasive blasting can target and remove the corrosion more efficiently, leading to better results.

A plotter is a component of a computerized stencil system that cuts stencils to their final size. A plotter is a specialized device that uses a pen or a blade to create precise and accurate cuts on various materials. In the context of a stencil system, a plotter would be responsible for cutting stencils to their desired dimensions, ensuring that the stencils are correctly sized for their intended use. Therefore, the correct answer is plotter.

A plastic scraper would be the most suitable tool to dislodge blisters or bubbles during a corrosion inspection. Unlike a knife or metal scraper, a plastic scraper is less likely to cause further damage to the surface being inspected. It is a softer and less abrasive tool that can effectively remove blisters or bubbles without scratching or gouging the material. Using a straight-edge may not be effective in dislodging blisters or bubbles, as it is primarily used for measuring or marking purposes.

The edge sealer should be allowed to dry for 24 hours before painting. This time frame is necessary to ensure that the sealer has fully cured and will provide a proper surface for the paint to adhere to. Painting too soon could result in the sealer not being fully dry, causing the paint to not adhere properly and potentially leading to peeling or other issues with the finished paint job. Waiting the full 24 hours allows for the best results and a long-lasting paint finish.

Corrosion that appears as blistering, exfoliation, and scaling or flaking is classified as severe. This is because these characteristics indicate significant damage and deterioration of the material, which can lead to structural weakness and potential failure. The presence of blisters, exfoliation, and scaling or flaking suggests that the corrosion has progressed to an advanced stage, requiring immediate attention and remediation to prevent further deterioration.

An atom that has gained or lost electrons and has acquired an electrical charge is called an ion. When an atom gains or loses electrons, it becomes either positively or negatively charged. This charge is balanced by the number of protons in the atom's nucleus. Therefore, an ion is formed when the number of electrons does not equal the number of protons, resulting in an overall charge. This distinguishes an ion from a proton, neutron, or electron, which are all fundamental particles of an atom but do not possess a net electrical charge.

Chemical conversion coating is a process used to protect metal surfaces from corrosion. Applying it immediately after cleaning a water break-free surface ensures that the metal is free from any contaminants or residues that could interfere with the coating's effectiveness. By applying the chemical conversion coating at this stage, the metal surface is prepared and ready to receive the protective coating, maximizing its adhesion and corrosion resistance properties. Applying the coating immediately after corrosion removal procedures may not be ideal as there could still be remnants of corrosion present on the surface, which could compromise the effectiveness of the coating.

Stress-cracking corrosion occurs when a material is exposed to both tensile stress and a corrosive environment. The combination of these factors leads to the formation of cracks in the material, which can propagate and cause failure over time. This type of corrosion is commonly observed in materials such as metals and polymers, and it can occur in various industries such as oil and gas, chemical processing, and automotive. The cracks formed in stress-cracking corrosion are often narrow and can be difficult to detect, making it a significant concern for the integrity and reliability of structures and components.

The first step when preparing a part to blast in the plastic media blasting booth is to thoroughly clean the substrate. This is important because any dirt, grease, or contaminants on the surface can interfere with the blasting process and prevent the desired results. Cleaning the substrate ensures that the plastic media can effectively remove any rust, paint, or other coatings from the part, allowing for a smooth and successful blasting process.

The correct answer is a six-digit numbering system expressed as three elements of two digits each. This means that MIDAS consists of six digits, with each digit being represented by two elements. This numbering system allows for a larger range of possible combinations compared to the other options provided.

Contrasting colors are used to paint service, ground handling, and hazard warnings/markings on aircraft. This is because contrasting colors provide better visibility and help to clearly distinguish these areas, ensuring safety and effective communication. The use of contrasting colors aids in quickly identifying potential hazards and ensuring that ground personnel can easily navigate around the aircraft.

The first step of a general corrosion inspection is to ensure that the area has been thoroughly cleaned. This is important because any dirt, debris, or contaminants on the surface can interfere with the inspection and make it difficult to accurately assess the extent of corrosion. By cleaning the area beforehand, the inspector can get a clear view of the metal surface and identify any signs of corrosion more effectively.

Specialty walkway coatings should be applied to the aircraft before top coating. This is because applying the coatings before the top coat ensures that they adhere properly and provide the desired level of protection and durability. If the coatings were applied after the top coat, they may not bond effectively and could be easily damaged or worn off. Therefore, applying specialty walkway coatings before the top coating is crucial for achieving the desired results and ensuring the longevity of the coatings.

The qualified products list (QPL) is a list that displays specific products that comply with military specifications. This means that the products listed on the QPL have been tested and meet the standards set by the military. The QPL is a useful tool for procurement officers and others who need to ensure that the products they are purchasing meet the necessary requirements, such as color, drying time, and adhesion. By consulting the QPL, they can easily identify which products are approved for use in military applications.

A paint facility would be the most appropriate location to use a paint roller when painting aircraft. This is because a paint facility is specifically designed and equipped for painting tasks, ensuring proper ventilation, containment, and safety measures. Painting an aircraft located in a maintenance hangar, at an unimproved airfield, or on a flight line may not provide the necessary facilities and conditions required for using a paint roller effectively and safely.

The formula (A + B) ÷ 2 - C = Depth would be used to determine the maximum corrosion pit depth when using a depth gauge. This formula calculates the average of A and B, and then subtracts C from the average to find the depth.

The distance that the spray gun nozzle is held from the surface depends on the desired width of the spray pattern and the type of gun used. Different spray guns have different spray patterns and the width of the pattern can be adjusted by changing the distance between the nozzle and the surface. Additionally, the type of gun used may also affect the distance as different guns may have different spray characteristics. Therefore, the desired width of the spray pattern and type of gun used are the factors that determine the distance at which the spray gun nozzle should be held from the surface.

The maximum amount of hazardous waste that can be stored in one satellite point is 55 gallons. This limit is set to ensure the safe storage and handling of hazardous materials, as exceeding this amount could pose a greater risk of accidents or environmental damage. It is important to adhere to these regulations to protect both human health and the environment.

The touch-up pen paint applicator should be mixed for 60 seconds prior to use. This ensures that the paint is well-mixed and ready to be applied smoothly and evenly. Mixing the paint for too short a time may result in uneven coverage or a streaky finish, while mixing it for too long may introduce air bubbles or cause the paint to become over-mixed. Therefore, 60 seconds is the optimal amount of time to mix the paint before using the touch-up pen.

When mechanically removing coatings on steel and titanium alloy, it is important to ground the part and ensure that the area is well ventilated. Grounding the part helps to prevent the buildup of static electricity, which can be dangerous when working with these materials. Additionally, having a well-ventilated area helps to remove any fumes or particles that may be released during the coating removal process, ensuring a safe working environment.

Stenciling is a rapid way of preparing a sign because it involves using a pre-cut template to create a design or text on a surface. By placing the stencil on the desired surface and applying paint or ink over it, the design can be easily transferred with precision and speed. This method eliminates the need for freehand drawing or transferring the design by hand, making stenciling an efficient and effective way of preparing a sign.

When removing corrosion with a hand-held wire brush, using a linear motion is the most suitable. This means moving the brush back and forth in a straight line. This motion allows for more controlled and consistent brushing, ensuring that the corrosion is effectively removed. Circular or oscillating motions may not provide the same level of precision and may result in uneven removal of the corrosion. Cross hatch motion, which involves brushing in a crisscross pattern, is not necessary for removing corrosion and may be more suitable for other purposes.

Material compatibility refers to the ability of a medium to not cause additional corrosion. This means that when choosing a material or medium to be used in a specific environment or with certain substances, it is important to select one that will not react with the surroundings in a way that promotes corrosion. The correct answer indicates that the chosen medium should not contribute to the corrosion process, ensuring the longevity and integrity of the material being used.

A straight edge can be used to detect skin bulge in the early stage of corrosion when inspecting spot welds. By placing the straight edge over the surface of the weld, any irregularities or bulges can be easily identified. This tool helps in identifying potential corrosion issues before they become more severe and cause structural damage.

The job guide contains operational checkout procedures. It provides step-by-step instructions and guidelines for performing various tasks and checks related to the operation of a specific system or equipment. It helps technicians in ensuring that all necessary procedures are followed correctly and in the proper sequence to ensure the smooth operation of the system or equipment. The job guide is an essential resource for technicians to perform operational checkouts effectively.

Corrosion preventive compounds (CPC) are used to prevent corrosive materials from contacting and corroding bare metal surfaces. This means that CPC creates a protective barrier between the corrosive materials and the metal surfaces, preventing them from coming into direct contact and causing corrosion. By doing so, CPC helps to prolong the lifespan of the metal surfaces and maintain their integrity.

Before removing corrosion, it is necessary to determine the allowable damage removal limits. This means understanding the extent to which the corrosion can be removed without causing any further damage to the surface or structure. This is crucial in order to ensure that the removal process does not compromise the integrity or functionality of the object being treated. By determining the allowable damage removal limits, one can effectively plan and execute the corrosion removal process while minimizing any potential risks or negative consequences.

When the coating material is too cold, it can cause orange peel when spray painting. This is because cold coating material does not flow smoothly and evenly onto the surface, resulting in a textured or uneven finish known as orange peel. The cold temperature prevents the material from properly leveling out, leading to a rough and bumpy appearance.

Exfoliation corrosion is an advanced form of intergranular corrosion where corrosion occurs along the grain boundaries of a metal, leading to the formation of layers or sheets that peel away from the surface. This type of corrosion is commonly observed in aluminum alloys, particularly those with a high copper content. It occurs due to the preferential attack of the grain boundaries by corrosive agents, leading to the weakening and eventual detachment of the corroded layers.

The maximum nozzle pressure of a high volume low pressure (HVLP) spray gun is 10 psi. This means that the spray gun can deliver a maximum pressure of 10 pounds per square inch, which is suitable for applications that require a low pressure spray, such as automotive painting or furniture finishing. HVLP spray guns are designed to minimize overspray and provide a more controlled and efficient spray pattern, making them a popular choice in various industries.