Aircraft Volume 3 Unit Review Exercises

Maintenance stand C-1 is not adjustable.

The correct answer is "RED X qualified supervisor." When filling out an AFTO Form 1492, the signature block must be signed by a RED X qualified supervisor. This indicates that the supervisor has the necessary knowledge and expertise to properly assess and address any potential safety hazards or issues identified on the form. Other personnel, such as SSgts, tool room personnel, or the most qualified 5-level, may not have the required qualifications to sign the signature block.

The correct answer is truss because truss fuselage construction uses a fabric or thin metal covering and is commonly found on small, lightweight aircraft. Truss construction consists of a framework of interconnected beams or rods that provide strength and support to the fuselage. This type of construction is lightweight and cost-effective, making it suitable for smaller aircraft where weight and cost considerations are important. Cantilever, monocoque, and semimonocoque are other types of fuselage construction methods that are not characterized by a fabric or thin metal covering.

The correct answer is C-1. The reason why C-1 is the correct answer is because it is specifically designed to be easily moved by a single person. The B-1 and B-2 maintenance stands are larger and heavier, requiring more than one person to move them. The Manlift option is not a maintenance stand, but rather a type of equipment used for lifting personnel to higher areas. Therefore, C-1 is the only option that fits the criteria of being easily moved by oneself.

Hands-free type scrub sinks are required in existing fuel system facilities to ensure proper hygiene and prevent the spread of contaminants. These sinks allow users to operate them without touching them directly, reducing the risk of cross-contamination. This is especially important in fuel system facilities where cleanliness and safety are crucial.

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The correct answer is 3 because the double-twist method involves safety-wiring two bolts together by twisting the wire around them in opposite directions. This creates a secure connection between the bolts and prevents them from loosening. Since each pair of bolts requires one wire, the maximum number of widely-spaced bolts that can be safety-wired together using this method is three. If there were more than three bolts, additional wires would be needed to connect them all.

Low observable (LO) technology refers to the design and construction techniques used to minimize an aircraft's radar signature, making it difficult for enemy radar systems to detect and track the aircraft. By reducing the radar signature, modern aircraft equipped with LO technology can avoid detection by enemy radar, increasing their chances of survival and mission success. This technology includes features such as stealth coatings, shape optimization, and radar-absorbent materials, all aimed at reducing the aircraft's radar cross-section and making it less visible to enemy radar systems. Therefore, the correct answer is enemy radar.

After removing a fuel cell and discovering a defect, the next step would be to refer to the applicable technical order (TO) for allowable limits. This is important because the TO provides guidelines and specifications for the maintenance and inspection of aircraft components. By referring to the TO, one can determine whether the defect falls within the acceptable limits or if further action, such as condemning the cell and ordering a new one, is necessary. Pressurizing the cell to check for leaks may be part of the inspection process, but it is not the immediate next step after finding a defect. Ignoring the damage and reinstalling it would not be a safe or appropriate course of action.

The appropriate condition/action of an integral tank fuel leak is determined by both its classification and location. The classification refers to the severity and potential risks associated with the leak, while the location determines the accessibility and ease of repair. By considering both factors, the appropriate measures can be taken to address the leak effectively and ensure the safety of the aircraft and its occupants.

The Bioenvironmental Engineering Flight is responsible for evaluating industrial ventilation systems. This department specializes in assessing and ensuring the safety and health of individuals in various environments, including industrial settings. They have the expertise and knowledge to evaluate ventilation systems and ensure that they meet the necessary standards and regulations to protect workers from potential hazards and maintain a safe working environment.

The correct answer is MC-2A. MC-2A is a support equipment item that is designed to operate pneumatic tools at a maximum air pressure of 200 pounds per square inch (psi).

The question asks which task would be considered a change to the entry permit. The entry permit is a document that allows certain tasks or actions to be performed. Out of the given options, moving the aircraft from one repair location to another would require a change to the entry permit because it involves a different location than initially permitted. The other options do not involve a change to the permit.

The Model T477W bonding meter is specifically designed to measure resistance. This means that it is meant to determine the opposition to the flow of electric current in a circuit. It is not designed to measure voltage, wattage, or amperage.

Foam removed from a fuel tank needs to be stored in an electro-static-free plastic bag. This is because foam is highly flammable and can generate static electricity. Storing it in an electro-static-free plastic bag helps to prevent any static electricity buildup, reducing the risk of fire or explosion. An enclosed metal shed, open metal container, or vented rubber container may not provide sufficient protection against static electricity.

Soft-faced mallets and ball-peen hammers are used in fuel systems maintenance. Soft-faced mallets have a non-metallic face that prevents damage to delicate parts while still providing enough force to make adjustments or repairs. Ball-peen hammers have a rounded end and a flat end, with the rounded end used for shaping metal and the flat end used for striking punches and chisels. These types of hammers are suitable for working on fuel systems as they provide the necessary precision and force without causing damage to the components.

The given answer is "Light" because the description of the situation indicates that the corrosion is not very severe. The protective coating is scarred and the metal is discolored, but the pitting has only occurred to a depth of one mil (0.001 inch). This suggests that the corrosion is not extensive and can be classified as light.

Countersunk rivets are used on the top skin surface of an aircraft. These rivets have a tapered head that sits flush with the surface, providing a smooth and aerodynamic finish. This helps to reduce drag and maintain the aircraft's performance. Flathead, roundhead, and brazier head rivets are not typically used on the top skin surface as they would create a protrusion or uneven surface, which could negatively impact the aircraft's aerodynamics.

The correct answer is "Cut the safety wire." When removing a V-band type coupling, the first step is to cut the safety wire. This is necessary to release the tension and secure the coupling. Once the safety wire is cut, the coupling can be easily removed by following the remaining steps.

The size of a bolt is generally stated in terms of its diameter, length, and threads per inch. The diameter refers to the thickness of the bolt, the length refers to the overall size of the bolt, and the threads per inch refers to the number of threads that are present on the bolt per inch of length. These three measurements are important in determining the size and compatibility of a bolt for a specific application. The weight, head size, and grip length are not typically used to describe the size of a bolt.

The hi-lok type of fastener is a feature that can be installed with hand tools. This means that it does not require specialized equipment or power tools to be installed. This feature makes it convenient and accessible for use in various applications. It being a single-part fastener means that it does not consist of multiple components. The statement about it being easily overtorqued is not mentioned in the question or answer choices. Lastly, the question does not provide information about the strength of the hi-lok fastener.

The correct answer is Empennage. The empennage is the assembly at the aft end of the fuselage of conventionally designed aircraft. It includes the horizontal stabilizer, vertical stabilizer, and control surfaces such as the elevator and rudder. The empennage plays a crucial role in providing stability and control to the aircraft during flight.

The use of cotter pins on aircraft systems is favorable because they can be removed and installed quickly. This is important in aircraft maintenance and repairs, as it allows for efficient and timely servicing of the systems. Additionally, quick removal and installation of cotter pins can help minimize downtime and ensure that the aircraft is back in operation as soon as possible.

When removing fire suppression foam from an aircraft fuel tank, it is important to wear chemical-resistant gloves. This is because the foam may contain chemicals that can be harmful to the skin. Wearing chemical-resistant gloves provides a barrier between the foam and the skin, reducing the risk of exposure to these chemicals.

When cells are stored for a long time in a dry climate, they tend to lose moisture and become dehydrated. This dehydration causes the cells to shrink in size.

Fire Protection Services must be notified prior to opening fuel tanks because they are responsible for ensuring the safety of the facility and preventing any potential fire hazards. Opening fuel tanks can be a dangerous task, as it involves handling flammable materials. Fire Protection Services will assess the situation, provide necessary safety precautions, and supervise the process to minimize the risk of fire or any other accidents.

When serving as an attendant, the most important role is recognizing symptoms of over exposure. This is crucial because it helps in identifying and addressing any potential health risks or hazards that the entrant may be facing. By being able to recognize symptoms such as dizziness, nausea, or difficulty breathing, the attendant can take immediate action to ensure the safety and well-being of the entrant. This role is vital in preventing any serious health issues or accidents from occurring during the task at hand.

The correct answer is "nylon barrier". In a self-sealing cell that contains fuel, the ply refers to a layer or sheet of material. The nylon barrier is the layer responsible for sealing and preventing the fuel from leaking. It acts as a protective barrier and helps maintain the integrity of the cell by preventing fuel leakage. Buna gum and sealant layer are not specifically mentioned in the question and therefore are not the correct answers.

When draining fuel into a metallic container, it is important to bond the container to the aircraft. This is necessary to prevent the buildup of static electricity, which could potentially cause a spark and ignite the fuel vapors. Bonding the container to the aircraft ensures that any static charge is safely discharged, reducing the risk of fire or explosion.

Flexible hose is used in areas of the aircraft that are subject to a great amount of vibration because flexible hoses can absorb the vibrations and prevent damage or failure. The flexibility of the hose allows it to move and adjust with the vibrations, ensuring that it remains intact and functional. In areas where there is no vibration or where rigidity is required, flexible hoses may not be necessary as they are designed specifically to accommodate and withstand vibrations.

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The most important factor in isolating a fuel cell leak is having knowledge of the cavity drain system. This means understanding how the fuel cell is designed and how it is connected to the surrounding components. By having this knowledge, one can identify the potential pathways for fuel leakage and take appropriate measures to isolate and fix the leak. The size of the fuel leak, whether or not the cell is a bladder type, and the construction of a cross-sectional view are not as crucial in isolating the leak as having knowledge of the cavity drain system.

When using an electric knife to cut foam, the motor speed is not something that needs to be inspected. The motor speed is controlled by the knife itself and does not require any manual adjustment or inspection. It is more important to inspect the cut wires to ensure they are not damaged, the blade installation to ensure it is secure and properly aligned, and any cracks in the body of the knife that may affect its performance or safety.

If an air hose is run over by heavy equipment, it will rupture. This means that the hose will break or burst, causing a hole or tear in the material. Running over the hose with heavy equipment puts a significant amount of pressure and force on it, which can cause it to become damaged and ultimately rupture.

After using the sealant filleting gun, it is important to clean the residual sealant. This is necessary to prevent the sealant from hardening and clogging the gun, which could affect its performance in future use. Cleaning the residual sealant also helps to maintain the gun in good condition and ensures that it is ready for the next application.

An Ontario knife would be the best tool for cutting small quantities of replacement foam for a fuel tank because it is a versatile and sharp knife that can easily cut through foam material. A razor blade may not be as effective as it is not specifically designed for cutting foam. A hacksaw would be too large and cumbersome for cutting small quantities of foam. A stitcher is not a suitable tool for cutting foam.

A pneumatic buffer is a tool used to smooth and polish surfaces. It is not suitable for repairing a fuel cell fitting, as it does not have the necessary features or capabilities to perform such a task. Fuel cell fittings require precision and specific tools for proper repair, which a pneumatic buffer does not provide.

The correct answer is "Approved cleaning solvent." When tools are extremely greasy and grimy, it is important to use a cleaning solvent that is specifically approved for this purpose. JP-4 or gasoline may be flammable and pose safety risks, while methyl ethyl ketone (MEK) may be too harsh and damaging to the tools. Using an approved cleaning solvent ensures effective and safe cleaning of the tools. Aluminum oxide abrasive cloth is not suitable for cleaning greasy and grimy tools as it is an abrasive material used for polishing and sanding.

To tighten an internal wrenching nut, you should use an Allen wrench. Allen wrenches, also known as hex keys, have a hexagonal-shaped head that fits into the corresponding hexagonal hole in the nut. This type of wrench provides a secure and precise fit, allowing you to apply the necessary torque to tighten the nut effectively. Adjustable jaw wrenches are used for different types of nuts that require adjustable sizes, while recessed wrenches and sockets are not specifically designed for internal wrenching nuts.

An acid brush should be used to apply a brush coat of sealant. Acid brushes are commonly used for applying sealants and other chemicals because they have bristles made of natural fibers that are resistant to acid and other corrosive substances. The bristles are also firm enough to evenly spread the sealant on the surface, ensuring proper coverage. Using an acid brush for this purpose is more effective and efficient compared to using a spatula, a paint brush, or a fairing tool.

The primary structural components of an aircraft wing include the spars, ribs, and skin. The spars are long, horizontal beams that run the length of the wing and provide the main structural support. The ribs are vertical or diagonal supports that connect to the spars and help maintain the wing's shape. The skin, also known as the wing covering, is the outermost layer of the wing and provides aerodynamic smoothness and protection to the internal components. The stringers are additional structural members that run parallel to the spars and provide additional support. The empennage refers to the tail section of the aircraft, which is not a part of the wing. The trailing edge is the rear edge of the wing, which is also not a primary structural component.

In a new facility, emergency personnel showers must have privacy enclosures. This is important to ensure the privacy and dignity of the individuals using the showers. Having privacy enclosures allows emergency personnel to shower in a separate and enclosed space, providing them with the necessary privacy while maintaining hygiene standards. This also helps create a comfortable and respectful environment for emergency personnel to clean up after potentially hazardous situations.

The correct answer is "Antistatic, nonmetal." In the fuel systems repair area, it is important to prevent sparks or static electricity that could potentially ignite flammable fuels. Therefore, the wheels installed on rolling support equipment must be antistatic, meaning they are designed to dissipate static electricity and prevent sparks. Additionally, they must be made of a nonmetal material to further minimize the risk of sparks.

In order to set up the open repair area, the powered support equipment should be placed outside the 50 foot marked area. This ensures that the equipment is not too close to the ropes and allows for a safe and organized work environment. Placing the equipment outside the 50 foot marked area also allows for sufficient space for other activities and personnel to move around without any hindrance.

The recommended method of purging an aircraft fuel tank is through a combination purge. This method uses a combination of blow purge and fluid purge techniques. Blow purge involves using compressed air or gas to blow out any remaining fuel from the tank, while fluid purge involves using a cleaning fluid to flush out any contaminants. By combining these two methods, the fuel tank can be effectively purged of any fuel or contaminants, ensuring safe and efficient operation of the aircraft.

The next step prior to repairing the fuel leak is to find the leak source. This is important because it allows for a targeted and effective repair. By locating the exact point where the fuel is leaking, the repair can be focused on that specific area, ensuring a thorough and lasting fix.

To prepare the surface for the new fillet after removing the defective sealant, it is recommended to abrade 1/2 inch from the ends of the fillet. This will ensure that the surface is properly prepared and ready for the application of the new fillet. Abrading too close to the ends or not enough may result in inadequate adhesion of the new sealant, compromising its effectiveness.

When injecting using a high pressure injection gun, providing an air escape will protect the aircraft structure. This is because high pressure injection can cause air pockets to form, which can lead to structural damage if not released. Providing an air escape allows the air to be safely released, preventing any potential harm to the aircraft structure.

The fuel cell is plasticized prior to storage in order to prevent cracking and drying. This process involves adding a plasticizer, which is a substance that helps to maintain the flexibility and moisture content of the cell material. By preventing cracking and drying, the plasticizer ensures that the fuel cell remains in good condition and is able to function effectively when it is used.

The one-part sealant injection gun is specifically designed to inject sealant into channels under the wing skin. This suggests that the sealant is intended to be applied in areas where there are channels, which are likely to be present under the wing skin. This method of injection is not suitable for prepacks, loose rivet holes, or voids inside the tank, as it is specifically designed for channels under the wing skin.