M7 Part 5 (Final)

Defueling an aircraft must be carried out outside a hangar where there are no fire hazards because it is a safety precaution. Fueling or defueling an aircraft involves handling flammable materials, and it is essential to minimize the risk of fire. Conducting the process outside reduces the chances of accidental ignition or the spread of fire in case of a mishap. Additionally, ensuring that there are no fire hazards nearby further enhances safety by eliminating potential sources of ignition.

The cross-sectional area of the wire determines the amount of electrical current it can conduct. A larger cross-sectional area allows for more space for the flow of electrons, resulting in a greater current-carrying capacity. Conversely, a smaller cross-sectional area restricts the flow of electrons, reducing the amount of current that can pass through the wire. Therefore, the cross-sectional area of the wire is a crucial factor in determining its conductivity.

Brazing temperature is higher than soldering temperature because brazing involves joining two metal pieces by melting a filler metal that has a higher melting point than the base metals being joined. Soldering, on the other hand, uses a lower melting point filler metal to join the metals. Therefore, brazing requires a higher temperature than soldering.

A Brinelling mark refers to a form of damage caused by excessive load or impact on a bearing cup. It appears as a smooth depression on the surface and is typically caused by a heavy object or force being applied to the bearing cup. This can result in permanent deformation of the metal, leading to reduced bearing performance and potential failure.

The correct answer is plastic deformation because swaging involves reshaping or forming the end of a cable by applying pressure or force, causing the material to undergo plastic deformation. This process permanently changes the shape of the material without melting or joining it with another material, making plastic deformation the most suitable explanation for the given operation of swaging. Soldering and brazing involve joining two or more materials using heat and a filler metal, which do not align with the description of swaging.

After removing a rivet, it is important to check the hole for its limits. This means ensuring that the hole is still within the specified dimensions and tolerances. Checking for limits ensures that the hole is not too large or too small, which could affect the proper fitting and function of a new rivet or fastener. This step is necessary to maintain the structural integrity and safety of the assembly.

The important precaution for refueling is to ground the fueling browser to the aircraft. This is necessary to prevent any static electricity buildup that could potentially cause a fire or explosion during refueling. Grounding the fueling browser ensures that any static charges are safely discharged, reducing the risk of accidents. Switching off the APU and ensuring no passengers are on board are also important precautions, but the grounding of the fueling browser is the most crucial step in ensuring safety during refueling.

A bottoming tap is used to cut a full thread to the bottom of a blind hole. Unlike a taper tap, which gradually tapers towards the end, a bottoming tap has a shorter chamfer and is designed to cut threads all the way to the bottom of the hole. This type of tap is used when a complete thread is needed in a blind hole, where the tap cannot pass through the other side. The bottoming tap ensures that the thread is cut to the desired depth, allowing for a secure and tight fit when a screw or bolt is inserted.

The reason why oxygen and combustible gas cylinders should not be stored together is because oxygen supports combustion, making it highly flammable. If oxygen comes into contact with a combustible gas, it can accelerate the combustion process and potentially lead to a fire or explosion. Therefore, it is important to store these two types of cylinders separately to minimize the risk of accidents.

The correct answer is "Heated Type 1 FPD de-ice followed by Type 2 FPD mixed with water." This combination of de-icing and anti-icing methods is effective in removing ice from the aircraft and providing a long hold period. The heated Type 1 FPD de-ice helps to melt the ice that has accumulated on the aircraft, while the Type 2 FPD mixed with water provides a protective coating to prevent further ice formation. This combination ensures that the aircraft remains ice-free for an extended period of time.

A schematic diagram would provide a visual representation of the components and connections within the constant speed unit, allowing the technician to understand the principle of operation. It would show the electrical and mechanical components, their interconnections, and how they function together. By studying the schematic diagram, the technician can identify any faulty components or connections that may be causing the oil leak and take appropriate troubleshooting measures.

The bit of a common soldering iron is made up of copper because copper is an excellent conductor of heat. This allows the soldering iron to quickly and efficiently transfer heat to the solder, melting it and creating a strong bond between the components being soldered. Copper also has good corrosion resistance, which helps to prolong the lifespan of the soldering iron bit.

When joining components using a nut and bolt, it is usually fitted with the head forward, inboard, and upward. This positioning ensures that the bolt is inserted into the component in a way that is least likely to cause damage during installation. Placing the head forward allows for easier access and visibility, while positioning it inboard and upward helps to prevent interference with other components or structures. This orientation ensures a secure and efficient assembly process.

In reaction riveting, a suitable snap or set is held in the riveting gun. This is because the riveting gun is the tool used to drive the rivet into the workpiece, and the snap or set is the part of the gun that contacts the rivet. By holding the snap or set in the riveting gun, it allows for precise control and force application during the riveting process.

Secondary bonding refers to the weak intermolecular forces between molecules or atoms. These forces are relatively weaker compared to primary bonding (ionic, covalent, or metallic bonding). As a result, secondary bonding has a maximum resistance of 1 ohm, which is higher than the other options provided (10 ohm and 0.05 ohm).

The correct answer is "Dressing". Dressing is the process of removing the dull and worn-out abrasive grains from the surface of the grinding wheel, exposing fresh and sharp grains. This is done to maintain the shape and cutting ability of the wheel, ensuring its effectiveness in grinding operations. Sharpening refers to the process of making the edge of the wheel sharper, while polishing involves giving a smooth and shiny finish to the workpiece. However, in the context of reconditioning a grinding wheel, dressing is the most appropriate option.

The term "thermocouple-type measures" refers to a type of temperature measurement using a thermocouple. Thermocouples are devices that generate a voltage proportional to the temperature difference between two points. The options given, "high frequency," "very high frequency," and "ultra high frequency," are not related to thermocouples or temperature measurement. Therefore, the correct answer is "Very high frequency."

Zinc chromate primer controls corrosion by releasing chromate ions on to the surface of the metal. These chromate ions form a protective layer that inhibits the corrosion process by preventing the metal from coming into contact with corrosive agents such as water or oxygen. This layer acts as a barrier, preventing the metal from undergoing oxidation and degradation.

Rubber cushioned clamps should be used to support hydraulic lines because they provide insulation and protection against vibrations and excessive movement. The rubber cushioning helps to absorb shocks and prevent damage to the hydraulic lines caused by friction or rubbing against other surfaces. This type of clamp also helps to reduce noise and ensures a secure and stable installation of the hydraulic lines.

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