Jet Engine Mechanic 5 Level EOC Pretest (2A651)

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The turbine section of a jet engine keeps the compressor rotating. The turbine is connected to the compressor through a shaft, and as the hot gases from the combustion chamber pass through the turbine, they cause the turbine blades to rotate. This rotation is then transferred to the compressor, which helps to maintain the continuous flow of air into the engine and maintain its performance.

A career development course is a type of training that is provided to help individuals learn the knowledge portion of their job. This type of training is designed to enhance their skills, knowledge, and abilities in their specific career field. It typically covers a wide range of topics related to the job, including industry trends, best practices, and advanced techniques. By completing a career development course, individuals can acquire the necessary knowledge and expertise to excel in their job and advance in their career.

Part 1 of an AFTO form 244 contains information related to item identification. This means that it includes details about the specific item or equipment being inspected or reviewed. This section may include information such as the item's name, model number, serial number, or any other identifying information that is necessary for tracking and documenting the inspection process.

The recommended method of heating inner races of bearings before installing them is a hot-oil bath. This involves immersing the bearings in a bath of heated oil, which allows for even and controlled heating of the inner races. This method ensures that the bearings reach the desired temperature without causing any damage or distortion. Additionally, the hot-oil bath method is convenient and widely used in industries for bearing installation.

The turbine stator is responsible for directing the gases onto the first-stage turbine wheel blades in a jet engine. It is a stationary component that is located downstream of the combustion chamber. The stator vanes in the turbine stator guide the flow of hot gases from the combustion chamber onto the turbine blades, which in turn convert the gas energy into mechanical energy to drive the engine.

The factor that is not considered for borescope operator certification is age. Borescope operator certification typically focuses on factors such as maturity, rank, and experience, which are more relevant to the individual's skills and abilities in operating a borescope. Age is not a determining factor in assessing one's competency in this field.

After serving in the Air Force for 48 months, one is eligible to attend ADLS.

Hazardous waste storage areas must prevent unauthorized access to ensure the safety and security of the stored materials. Unauthorized access can lead to potential accidents, spills, or intentional harm to the environment and individuals. By restricting access to authorized personnel only, the risk of mishandling or misuse of hazardous materials is minimized, ensuring the proper containment and management of the waste.

The correct answer is "reaction-impulse". In jet engines, three types of turbine and vane assemblies are used: impulse, reaction, and reaction-impulse. The reaction-impulse type combines the characteristics of both impulse and reaction turbines, making it versatile and efficient. It is designed to harness the energy of the high-speed exhaust gases while also utilizing the pressure difference between the upstream and downstream sides of the turbine blades. This combination allows for optimal power generation and overall performance in jet engines.

If you are TDY (Temporary Duty) and both IMDS (Integrated Maintenance Data System) and SBSS (Standard Base Supply System) are not available, you would use AF IMT 2005 to order an engine part. This form is specifically designed for ordering and requesting supplies and equipment in the Air Force.

When handling jet engine bearings, it is important to change cotton gloves frequently because they can get soaked with sweat. This is because the work environment of handling jet engine bearings can be physically demanding and cause sweating. If the gloves become soaked with sweat, they can become uncomfortable to wear and may affect the grip and dexterity required for handling the delicate bearings. Additionally, sweat-soaked gloves can also become unhygienic and increase the risk of contamination or transfer of dirt and oil onto the bearings, which could potentially cause damage.

The sea-level atmospheric pressure at "standard day" conditions is 14.7. Atmospheric pressure is the force exerted by the weight of the air above a certain point. At sea level, the average atmospheric pressure is 14.7 pounds per square inch (psi) or 1013.25 millibars (mb). This value is considered the standard atmospheric pressure and is used as a reference point for weather measurements and calculations.

The pneumatic air bled from the small gas turbine engine cannot be used to inflate tires because the air bled from the engine is typically at a high temperature and pressure, which can cause damage to the tires. Additionally, the air bled from the engine may contain contaminants or impurities that can further affect the tire's performance. Therefore, it is not recommended to use this air source for inflating tires.

The correct answer is a small gas turbine engine. This is because the question is asking about the JFS (Jet Fuel Starter), which is a type of engine used to start larger gas turbine engines. The JFS itself is a small gas turbine engine that provides the necessary power to start the main engine. It is not a piston type starter or a pneumatic type starter, as mentioned in the other options.

A Category 1 DR is used to report a deficiency that, if uncorrected, will cause major loss or damage to equipment or a system. This means that the deficiency is critical and has the potential to result in significant harm or loss if not addressed. It is important to track and address these types of deficiencies to prevent any major damage or loss to the equipment or system.

The coded bands of colored tape placed around the tubing or hoses can be used to identify the various system lines used to transfer fluids and gases on jet engines. This method allows for easy visual recognition of the different lines, as each color represents a specific system. The use of colored tape eliminates the need for embossing specifications on the tubing or hoses, and it is a more practical and efficient way to differentiate between the lines compared to using different colors of tubing or hoses or relying on their orange color.

The primary goal of the ET&D program is to detect any decrease in performance or failures in turbine engines at an early stage. This allows for timely intervention and prevention of further damage to the engines. This goal is different from the other options provided, which focus on reviewing past accident reports, tracking components, and documenting specific conditions. The emphasis on early detection aligns with the objective of preventing or limiting damage to turbine engines.

Participating units should accelerate engines, modules, and accessories 2 years ahead. This means that they should speed up the development and production of these components by 2 years in order to meet the desired timeline or target.

The divergent design of a diffuser increases air pressure. A diffuser is a device that is used to slow down and expand the flow of a fluid, in this case, air. The divergent design of a diffuser gradually increases the cross-sectional area, which causes the air to slow down and increase in pressure. This is because the increased area allows the air molecules to spread out, resulting in a decrease in velocity and an increase in pressure. Therefore, the divergent design of a diffuser increases air pressure.

In order for a straight piece of tubing to remain serviceable, a dent must be less than 20% of the tubing diameter. This means that if the dent exceeds 20% of the tubing diameter, it may compromise the integrity and functionality of the tubing. Therefore, it is important to ensure that any dents in the tubing are smaller than this threshold to maintain its serviceability.

Water takes 4 times longer to settle in JP8 than in gasoline at room temperature.

When attempting to unfeather the 54H60-91 propeller in flight, the throttle must be positioned above FLT IDLE. This means that the throttle should be set to a higher position than the flight idle position.

The proper bolt length should allow a minimum of 2 threads protruding the nut. This is important for ensuring a secure and tight connection between the bolt and nut. Having at least 2 threads engaged provides enough engagement for proper load distribution and prevents the nut from easily coming loose. It also helps to prevent stripping or damaging the threads, which could compromise the integrity of the connection. Therefore, 2 threads is the minimum requirement for a safe and effective bolt and nut assembly.

Lockwiring is a method used to secure fasteners in place by twisting a wire around them. The proper stiffness is necessary to ensure that the fasteners do not loosen or come undone. In this case, the correct answer is 8-10 twists per inch. This means that for every inch of wire used for lockwiring, it should be twisted 8-10 times. This range of twists provides the right amount of tension and stiffness to keep the fasteners securely in place.

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 the force exerted by a spring. This ensures that the seal remains in contact with the mating surface and prevents any leakage or loss of pressure. Spring pressure is a reliable and consistent method of providing the necessary preload for a carbon seal when the engine is not in operation.

In a simple AC generator, the slip rings are connected to the rotating loop, which produces an alternating current. The brushes make contact with the slip rings and transfer the current to the electrical device, allowing it to operate. The commutator is typically found in DC generators, not AC generators. Permanent magnets are used to create a magnetic field in the generator but do not directly transfer the current to the electrical device.

A propeller's axis of rotation extends 10 feet to the front and 5 feet from the rear.

Upon receiving an engine in the shop, one should inspect the compressor inlet. This is an important step to ensure that there are no blockages or damages that could affect the engine's performance. By inspecting the compressor inlet, any potential issues can be identified and addressed before further examination or repairs are conducted. It is a crucial part of the overall inspection process to guarantee the engine's proper functioning and prevent any potential damage or malfunctions.

The Journeyman must be aware of the corrosiveness of modern jet engine oil. 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, if it is corrosive, it can cause corrosion or erosion of the engine components, leading to potential malfunctions or failures. Therefore, being aware of the corrosiveness is crucial for the Journeyman to ensure the proper maintenance and safety of the aircraft.

The correct answer is "thimble". A micrometer is a precision measuring instrument used to measure small distances or thicknesses. The thimble is a rotating component of the micrometer that is adjusted to precisely measure the object being measured. By turning the thimble, the user can adjust the position of the spindle, which moves the measuring faces of the micrometer closer together or further apart, allowing for accurate measurements to be taken. The barrel and frame are other components of the micrometer, but they are not directly involved in the adjustment process.

The correct answer is B-4. This maintenance platform can be adjusted from 3 to 7 feet.

The No. 1 bearing assembly on an F100-PW-220 engine is located in the front compressor stator inlet shroud. This component is responsible for directing the airflow into the compressor and plays a crucial role in the engine's overall performance. The bearing assembly is housed within the inlet shroud to provide support and ensure smooth rotation of the compressor blades. It is positioned at the front of the engine to efficiently capture and guide the incoming air into the compressor section.

The secondary airflow on the F108 engine produces 80% of the total engine thrust.

The T700 engine AGB routes oil and fuel through internal passages. These passages are located within the engine and are responsible for transporting oil and fuel to various components and subsystems within the engine. Unlike external lines or passages, which are located outside of the engine, internal passages ensure that the oil and fuel are contained within the engine and are properly distributed to where they are needed.

During synchrophaser governing, the master propeller controls the speed of the slave propellers. If the master propeller fails, the slave propellers will no longer be synchronized and will experience a slight speed change. This change is typically around 2% because the slave propellers are still able to maintain some level of synchronization without the master propeller. Therefore, the correct answer is about a 2% speed change.

The stationary (stator) vane blades on the T56 compressor are used to increase pressure. These blades are strategically placed in the compressor to redirect the airflow and increase its pressure as it passes through. By creating a narrower passage for the air, the stator blades effectively squeeze the air molecules closer together, resulting in an increase in pressure. This increased pressure is essential for the efficient functioning of the compressor and the overall performance of the engine.

The operational control of the F108 engine is achieved through the use of the power lever, fuel shutoff lever, and the PMC (Power Management Computer). The PMC is responsible for monitoring and controlling various engine parameters such as fuel flow, thrust, and engine performance. It receives inputs from the power lever and fuel shutoff lever to adjust these parameters accordingly. Therefore, the PMC plays a crucial role in managing and controlling the operation of the F108 engine.

Air Force instruction 21-101 defines quality maintenance and mandates maintenance personnel to exhibit integrity and adhere to all written guidance.

The engine remote trimmer allows for the adjustment of the fuel control without having to be physically under the engine. This means that the fuel control can be adjusted from a remote location, providing convenience and safety for the person making the adjustment.

The first part of a TO number identifies the category and type of equipment in the TO. This means that the TO number provides information about the specific equipment that the TO is referring to. It helps in classifying and categorizing the TOs based on the type of equipment they pertain to, making it easier for users to locate the relevant TO for a particular equipment.

The correct answer is "Top of the head to the bottom of the screw threads." This is because when measuring the length of a screw, you start from the top of the screw's head and measure down to the bottom of the screw threads. This measurement includes both the shank (the smooth portion of the screw) and the threaded portion.

The intermediate case of the F119-pw-100 engine contains the No.2 and No.3 bearing compartments.

A dry sump oil system is a type of oil system that stores the oil in a separate tank, typically mounted to the side of the engine. This system is commonly used in high-performance and racing engines as it offers several advantages over a wet sump system. By storing the oil externally, it allows for a larger oil capacity, better oil control, and reduced oil foaming. It also prevents oil starvation during high-speed cornering or acceleration, ensuring proper lubrication of engine components. Therefore, the correct answer is dry sump.

There are two scavange oil pumps located in the RGB.

The master synchrophaser board in the synchrophaser unit contains a master channel and a slave channel. This means that it can control and synchronize the propellers connected to these channels. Therefore, the correct answer is no 2 and no 3, indicating that these propellers are controlled by the master synchrophaser board.

The augmenter fuel control is not attached to the gearbox assembly on the F119-PW-100 engine. The other options, including the actuator fuel pump, main fuel pump, and engine generator, are all attached to the gearbox assembly.

TO stands for Technical Order, which is a directive issued by the Air Force to provide instructions for the operation, maintenance, and repair of equipment. In this question, the correct answer is 00-5-1, as it covers information concerning the Air Force TO system. The other options, 00-5-2, 00-20-1, and 00-20-2, may cover different topics or aspects of the Air Force, but they do not specifically address the TO system.

The AE2100D3 power plant major assemblies include the PGB, torquemeter assembly, power section, accessory drives, and the nacelle structure. The nacelle structure is an important component of the power plant as it houses and supports the engine and other major assemblies. It provides structural integrity and aerodynamic efficiency to the power plant. Without a properly functioning nacelle structure, the power plant may not be able to operate efficiently and safely.

This statement is Newton's second law of motion. It states that an unbalanced force acting on a body will cause the body to accelerate in the direction of the force. The magnitude of the acceleration is directly proportional to the force applied and inversely proportional to the mass of the body. This law is commonly expressed as F = ma, where F is the force, m is the mass, and a is the acceleration.