2A6X1 Vol. 3 Ure's (Mfe)

The purpose of the fuel oil cooler is to heat the fuel and cool the oil. This is important because fuel needs to be heated in order to vaporize and combust efficiently, while oil needs to be cooled to prevent it from overheating and causing damage to the engine. By heating the fuel and cooling the oil, the fuel oil cooler helps to optimize the performance and longevity of the engine.

Aeration is the correct term used to indicate that air is being mixed with the oil in the oil pump to create pockets of air. Aeration occurs when air bubbles are introduced into the oil, leading to a decrease in the oil's lubricating properties and potential damage to the system. This can happen due to various reasons such as foaming, cavitation, or inadequate oil supply.

The main fuel control in an engine is responsible for regulating the fuel flow to the combustion chamber. By allowing the engine to safely accelerate, it ensures that the fuel-air mixture is properly balanced, reducing the possibility of a flameout. A flameout occurs when the flame in the combustion chamber is extinguished, causing the engine to stall. By preventing this, the main fuel control helps maintain the engine's stability and prevents potential damage or failure.

JP8 is a type of jet fuel used by the military. It is a blend of various hydrocarbon compounds, including gasoline and kerosene. Gasoline provides high energy density and improves the fuel's ignition characteristics, while kerosene helps to increase the fuel's flash point and stability. This combination allows JP8 to be used in a wide range of military aircraft and vehicles, providing efficient and reliable performance.

The DEEC (Digital Electronic Engine Control) controls the operation of the F100 engine when in primary mode. DEEC is responsible for monitoring and regulating various engine parameters such as fuel flow, temperature, and throttle position. It ensures optimal engine performance and efficiency by adjusting fuel mixture and other parameters based on the aircraft's demands.

The T56 engine fuel nozzle requires a spray pattern inspection in addition to visual inspection. This means that apart from visually inspecting the nozzle, it is also necessary to check the pattern in which the fuel is sprayed. This inspection ensures that the fuel is being distributed evenly and in the correct pattern, which is crucial for the efficient functioning of the engine.

Microscopic metallic particles in the oil system are called wear metals. These particles are generated as a result of friction and wear between moving components in the machinery. Over time, these wear metals can cause damage to the equipment, leading to reduced performance and potential breakdowns. Therefore, monitoring and analyzing the presence of wear metals in the oil system is crucial for preventive maintenance and ensuring the longevity of the machinery.

Electromagnetic induction is the term used to describe the process of producing voltage in a conductor when it passes through a magnetic field. This phenomenon was discovered by Michael Faraday in the early 19th century and is the basis for the operation of generators and transformers. When a conductor moves through a magnetic field or when the magnetic field around a conductor changes, it induces an electric current in the conductor. This is the principle behind the generation of electricity in power plants and the functioning of many electrical devices.

The correct answer is a small gas turbine engine. This type of engine is commonly used in aviation and power generation applications. It consists of a compressor, combustion chamber, and turbine, which work together to produce power. Small gas turbine engines are often used as starters for larger engines, as they provide a reliable and efficient source of power to initiate the starting process.

Once the cooling airflow has done its job of cooling the turbine section, it is directed into the gas stream to exit the engine. This is because the cooling airflow has absorbed heat from the turbine section and needs to be expelled from the engine to maintain proper functioning and prevent overheating. The gas stream carries the cooling airflow out of the engine, allowing for a continuous flow of fresh air and efficient operation.

Hydroelectromechanical fuel control systems utilize various components such as thermocouples, relays, amplifiers, and solenoids to regulate and control the fuel flow in a jet engine. These systems combine hydraulic and electrical mechanisms to ensure precise fuel delivery, maintaining the engine's performance and efficiency. The use of both hydraulic and electrical components allows for a more sophisticated and accurate control of the fuel flow, contributing to the smooth operation of the jet engine.

In order to ensure that the fuel controls are properly set during engine trim, screws must be safety sealed or lockwired. This is done to prevent any unauthorized or accidental adjustments to the fuel controls, which could lead to potential safety hazards or engine malfunctions. Safety sealing or lockwiring the screws provides a visible indication that they have been properly set and prevents them from being tampered with without detection. This helps to maintain the integrity and reliability of the engine's fuel system.

The valve that allows fluid to flow in only one direction is called a check valve. This valve is designed to prevent backflow and ensure that fluid can only flow in a single direction. It is commonly used in plumbing systems and other applications where the reversal of fluid flow could cause damage or disruption. The check valve typically consists of a flap or a ball that opens when fluid flows in the correct direction and closes to block the flow when there is reverse pressure.

The air/oil coolers on an F100 engine are mounted on the fan duct and use the secondary fan airflow as a coolant. This means that the coolers are positioned in a way that allows the air from the secondary fan to pass through them, cooling down the oil. This is important because the oil in the engine needs to be kept at a certain temperature to ensure proper lubrication and prevent overheating. Using the secondary fan airflow as a coolant helps maintain the optimal temperature for the oil, ensuring the engine operates efficiently.

The P&D valve controls the pressurization of the core engine fuel system. It regulates the flow of fuel to maintain the desired pressure levels within the system. This valve ensures that the fuel is delivered at the correct pressure to the engine for efficient combustion and performance. The N2 sensor, fuel nozzle, and fan inlet sensor do not have a direct role in controlling the pressurization of the core engine fuel system.

An air oil cooler operates on the same principles as a car radiator. Both the air oil cooler and car radiator use air as the medium to cool down the fluid passing through them. In the case of a car radiator, air is used to cool the engine coolant, while in an air oil cooler, air is used to cool the oil. Both systems work by allowing air to flow through a series of fins or tubes, which dissipates the heat from the fluid, thus cooling it down. Therefore, the correct answer is air.

When an engine is not operating, static preload for a carbon seal is provided by spring pressure. This means that the carbon seal is compressed and held in place by a spring, ensuring a tight seal between two components. The spring pressure helps to maintain the integrity of the seal even when there is no air, oil, or hydraulic pressure present.

The device that separates the air from the oil in the engine oil tank is called a deaeration device. This device is specifically designed to remove any air or gas bubbles that may have entered the oil, ensuring that only pure oil is circulated through the engine. By removing the air, the deaeration device helps to prevent foaming or cavitation, which can lead to reduced lubrication efficiency and potential damage to the engine components.

The F108 engine's fuel injectors contain both primary and secondary fuel flow passages. This means that the injectors are designed to deliver fuel through two separate channels, allowing for more precise control of the fuel flow and combustion process. The primary fuel flow passages are responsible for delivering the main fuel supply, while the secondary passages provide additional fuel for optimal performance and efficiency. By having both primary and secondary passages, the F108 engine can ensure proper fuel delivery under varying operating conditions.

The AE2100D3 FADEC (Full Authority Digital Engine Control) is powered by the airplane's 28 VDC power supply until the engine RPM is sufficient for the alternator stator to take control. This means that initially, the power supply from the airplane is used to provide power to the FADEC system until the engine reaches the necessary RPM for the alternator stator to generate power and take over the control of supplying power to the FADEC.

The DEEC (Digital Electronic Engine Control) is the component that controls the augmentor fuel control on the F100 engine. It is a digital electronic system that monitors and adjusts various engine parameters to optimize performance and fuel efficiency. The DEEC receives inputs from sensors and makes real-time adjustments to the fuel flow, ensuring the correct amount of fuel is delivered to the augmentor for optimal thrust and combustion.

The T56 engine contains two gear fuel pumps and one boost fuel pump.

The filter bypass valve is the component on the F100 engine that permits oil to bypass the filter during cold weather starts. This valve allows oil to flow directly to the engine without passing through the filter, ensuring that the engine receives sufficient lubrication during startup when the oil is cold and thick. By bypassing the filter, the valve prevents any potential blockages or restrictions that may occur due to the cold oil, ensuring smooth engine operation during cold weather conditions.

The MFC (Main Fuel Control) on the f100 engine is capable of operating in two modes.

In a simple AC generator, the brushes are responsible for taking the current from the slip rings to operate the electrical device. The slip rings are connected to the rotating loop, which generates the alternating current. The brushes make contact with the slip rings and allow the current to flow from the generator to the electrical device. The commutator is typically found in DC generators and is used to convert the alternating current to direct current. The permanent magnet, on the other hand, is used to create a magnetic field in the generator but is not directly involved in transferring the current to the electrical device.

The correct answer is fan inlet guide vane flaps. The anti-icing system on an F110 engine is designed to prevent the formation and accumulation of ice on specific components. In this case, it specifically targets the fan inlet guide vane flaps. These flaps are located at the front of the engine and play a crucial role in directing airflow into the engine. If ice were to form and accumulate on these flaps, it could disrupt the airflow and potentially cause engine performance issues. Therefore, the anti-icing system is in place to ensure that these flaps remain ice-free and fully functional.

The oil pump check valve prevents oil in the oil tank from draining into the RGB rear case. This valve ensures that oil flows in one direction only, preventing any backflow or leakage into the RGB rear case. By maintaining the oil in the oil tank, it ensures proper lubrication and functioning of the RGB system.

The discharge air used for aircraft engine anti-icing to heat critical areas is taken from the compressor. The compressor is responsible for compressing the incoming air before it enters the combustion chamber. This compressed air is then used for various purposes, including anti-icing to prevent ice formation on critical areas of the engine. By using the discharge air from the compressor, the heat generated during compression can be utilized effectively for anti-icing purposes.

Water takes 4 times longer to settle in JP8 than in gasoline at room temperature. This suggests that JP8 has a higher viscosity compared to gasoline. Viscosity is a measure of a fluid's resistance to flow, and higher viscosity fluids take longer to settle. Therefore, the answer of 4 indicates that JP8 is thicker and more resistant to flow than gasoline.

The project monitor is responsible for ensuring that the OAP (Operating Airfield Pavement) operates properly. They oversee the project and monitor its progress, making sure that all aspects of the OAP are functioning correctly. This includes coordinating with various teams and personnel involved in the project, ensuring that all necessary resources and equipment are available, and addressing any issues or challenges that may arise during the operation. The project monitor plays a crucial role in ensuring the successful operation of the OAP.

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A dry sump oil system stores the oil in a separate tank that is not attached to the engine. This type of system is commonly used in high-performance or racing engines where the engine is subjected to high G-forces or extreme angles of operation. By storing the oil in a separate tank, it allows for better control over oil levels and prevents oil starvation during high-speed or aggressive driving conditions. The oil is pumped from the tank to lubricate the engine components and then returned to the tank for cooling and filtering before being recirculated.

The operational control of the F108 engine is achieved by the use of the power lever, fuel shutoff lever, and PMC (Propulsion Management Computer). The power lever is used to control the engine's thrust, while the fuel shutoff lever is used to stop the flow of fuel to the engine. The PMC is responsible for monitoring and controlling various engine parameters such as fuel flow, temperature, and pressure, ensuring optimal performance and safety.

The Journeyman must be aware of the corrosiveness of modern jet engine oil. This is because corrosiveness refers to the ability of a substance to cause damage or deterioration to materials it comes into contact with. In the case of jet engine oil, corrosiveness can lead to the degradation of engine components and potentially result in malfunctions or failures. Therefore, understanding the corrosive properties of the oil is crucial for the Journeyman to ensure the safe and efficient operation of the jet engine.

The commutator is the part of a generator that acts as an automatic switching device, changing the alternating current produced by the generator into direct current. It consists of a series of metal segments that are connected to the ends of the coils in the generator. As the generator rotates, the brushes make contact with the segments of the commutator, which causes the current to flow in one direction. This switching action ensures that the current produced by the generator is converted to a usable form for devices that require direct current.

The correct answer is FADEC. FADEC stands for Full Authority Digital Engine Control. It is an electronic system that continuously monitors the LVDT (Linear Variable Differential Transformer) signal and controls the compressor IGV (Inlet Guide Vane) position in the AE2100D3 engine. The FADEC system ensures optimal engine performance by adjusting the IGV position based on the LVDT signal, allowing for efficient and precise control of the engine's compressor.

When the mechanical type blockage thrust reverser is not in use, the doors retract around the engine exhaust cone, usually forming the rear section of the engine nacelle. This means that the doors are folded back and positioned around the exhaust cone, which is located at the rear of the engine nacelle. This allows for a streamlined shape and reduces drag during forward thrust operation.

The augmentor fuel pump on the F100 engine is driven by the 13th stage of the compressor. This means that the pump is connected to and powered by the 13th stage of the compressor, which is responsible for compressing the air before it enters the combustion chamber. This stage is specifically designed to provide the necessary power to drive the augmentor fuel pump efficiently.

When the null orifice on the T56 engine TD valve is set to zero, it means that there is no bypass of fuel through the valve. Therefore, the valve will not bypass any fuel, resulting in 0% bypass.

The correct answer is flap actuator. The flap actuator is responsible for regulating the amount of Ram air passing through the oil cooler core. It controls the opening and closing of the flap, which in turn adjusts the airflow. By adjusting the flap position, the flap actuator ensures that the appropriate amount of air is directed through the oil cooler core to maintain optimal cooling of the oil.

The correct answer is "filler cap with a graduated gauge". In an F108 engine, the oil level can be checked using the filler cap, which has a graduated gauge. This gauge allows the user to visually determine the oil level by observing the markings on the gauge. The filler cap is a convenient and accessible location to check the oil level without the need for additional tools or equipment.

SEM/EDX analysis is a technique used to analyze the composition of materials. Unlike conventional oil analysis, where samples need to be sent off-site for analysis, SEM/EDX analysis can be performed on-site. One major aspect that differentiates SEM/EDX analysis from conventional oil analysis is that particles must be free of oil for analysis to take place. This means that the particles being analyzed should not have any oil coating on their surface, as it can interfere with the accurate analysis of their composition. By ensuring that particles are free of oil, SEM/EDX analysis can provide reliable results concerning the condition of equipment and components.

The hydraulic motor is the item that initially rotates the JFS (Jet Fuel Starter) engine PTO (Power Take-Off). This means that the hydraulic motor is responsible for providing the initial rotational force to start the JFS engine.

The correct answer is ground start. In the T56 engine, the ground start switch energizes the starter control valve to the OPEN position. This allows the engine to start when it is on the ground.

The TD amplifier compares the desired throttle setting from the coordinator with the actual TIT signal from the thermocouples. It amplifies the signal and sends it to the fuel control unit to adjust the fuel flow accordingly.

The 50 percent engine cutout switch assembly is used to stop the JFS (Jet Fuel Starter) starting cycle when the aircraft engine has accelerated to starter cutout speed on the F-15 secondary power system. This switch assembly is specifically designed to cut off the engine at 50 percent power, preventing the JFS from continuing to start the engine once it has reached a certain speed.

The fuel/oil cooler heats the augmentor fuel to provide better vaporization and combustion. By cooling the fuel and oil, it helps to increase their density, allowing for more efficient combustion. This ensures that the fuel is vaporized properly, leading to improved combustion and overall performance of the system.

The two main types of augmentor ignition systems are torch igniter and pilot burner. A torch igniter is a device that produces a high-energy spark to ignite the fuel-air mixture in the augmentor, while a pilot burner is a small flame that is continuously burning to ignite the main fuel-air mixture. These two types of ignition systems work together to ensure proper and efficient ignition of the fuel in the augmentor.

The primary benefit of identifying an impending failure through OAP is improved safety. By detecting potential failures before they occur, necessary maintenance or repairs can be performed in a timely manner, preventing accidents or malfunctions that could jeopardize the safety of personnel or equipment. This proactive approach helps to minimize risks and ensure a safer working environment.

The T56 engine speed-sensitive control allows electrical current to flow to the fuel and ignition system at 16% RPM. This means that at this specific engine speed, the control system is activated and allows the necessary electrical current to be delivered to the fuel and ignition system, ensuring proper functioning and combustion of fuel in the engine.