2A652 Vol 3 CDC Ure 2015

The protective circuits of the A/M32A-86D are designed to safeguard the aircraft electrical system from potential harm caused by various electrical issues such as overload, overvoltage, undervoltage, and over/underfrequency. These protective circuits ensure that the electrical system remains within safe operating limits and prevent damage to the system components. By monitoring and responding to fault conditions, the protective circuits effectively protect the aircraft electrical system against potential damage, ensuring its proper functioning and longevity.

Before loading and unloading the gas turbine compressor (GTC), it is necessary to allow the engine to operate unloaded to reduce thermal stress. This is because operating the engine without any load helps in preventing excessive heat buildup and reduces the risk of thermal stress on the components. By reducing thermal stress, the engine's lifespan can be prolonged, and potential damage or failures can be avoided.

Service inspections are required after maintenance because maintenance activities can affect the performance and condition of the equipment. After maintenance, it is important to conduct a service inspection to ensure that the equipment is functioning properly and to identify any potential issues or problems that may have arisen during the maintenance process. This helps to ensure the safety and reliability of the equipment and prevent any further damage or breakdowns.

A multimeter is a versatile tool that can measure various electrical properties such as voltage, current, and resistance. It can be used to troubleshoot motors by checking for continuity, measuring voltage across different components, and testing for proper resistance values. A megger is specifically designed to measure insulation resistance and may not provide all the necessary measurements for motor troubleshooting. A growler is used to detect faults in the windings of a motor, but it is not as commonly used or versatile as a multimeter. A clamp-on ammeter measures current, which can be useful for troubleshooting motor issues, but it may not provide all the necessary measurements for a comprehensive diagnosis. Therefore, a multimeter is the most suitable tool for troubleshooting motors.

When troubleshooting any electrical system, it is important to start by identifying the last known source of power. This is because the issue could be related to a problem with the power source, such as a tripped breaker or a disconnected power supply. By determining the last known source of power, you can then proceed to inspect and diagnose the system from that point onward, ensuring that the power supply is functioning properly before moving on to other potential causes of the problem.

The correct answer is "generator TO and load bank TO." When testing a generator using a load bank, it is important to follow the procedures outlined in both the generator technical order (TO) and the load bank TO. These technical orders provide specific instructions and guidelines for safely and effectively conducting the test. Additionally, the career development course (CDC) may provide further information and training on generator testing, but it is not specifically mentioned in relation to using a load bank. Therefore, the correct answer is to follow the procedures outlined in the generator TO and load bank TO.

To prevent abnormal amounts of carbon, moisture, and sludge buildup in a diesel engine, it is best to avoid operating the engine for extended periods at no-load. This is because when the engine runs without any load, it operates at lower temperatures which can lead to incomplete combustion. Incomplete combustion can result in carbon deposits, moisture condensation, and sludge formation in the engine. Therefore, avoiding extended periods of no-load operation helps maintain higher operating temperatures and promotes complete combustion, reducing the likelihood of carbon, moisture, and sludge buildup.

In order to produce an electromotive force (EMF) mechanically, three things are necessary: a magnetic field, a conductor, and relative motion. The presence of a magnetic field is required to induce the EMF in the conductor. The conductor acts as a medium for the flow of electrons, which creates the EMF. Finally, relative motion between the magnetic field and the conductor is needed to generate the EMF. This relative motion causes the magnetic field lines to cut across the conductor, resulting in the production of the EMF.

Before connecting a generator set to the load bank, it is important to make sure that all on-off switches are in the OFF position. This is necessary to prevent any accidental power surges or electrical mishaps when connecting the generator to the load bank. By ensuring that all switches are in the OFF position, it reduces the risk of any electrical hazards and allows for a safe and smooth connection between the generator and load bank.

A three-phase generator is capable of supporting three different loads at the same time because it generates three separate alternating currents that are 120 degrees out of phase with each other. This allows for a more balanced and efficient distribution of power to the loads. In contrast, a single-phase generator can only support one load at a time, while a two-phase generator can support two loads but may not distribute power as evenly. Therefore, a three-phase generator is the most suitable option for supporting multiple loads simultaneously.

The A/M24T-8 electrical test set is capable of testing both alternating current (AC) and direct current (DC) power supplies. This means that it can be used to assess the functionality and performance of electrical equipment that operates on either AC or DC power, making it versatile and suitable for a wide range of applications.

The filtration step in the diesel engine fuel system is designed to prevent the fuel system from being damaged by foreign particles. These particles can cause abrasion and wear on the engine components, leading to decreased performance and potential breakdowns. By filtering out these particles, the fuel system is protected from any potential damage and ensures smooth operation of the engine.

After the A/M32A-60A generator set has reached 95 percent of governed speed, resetting the alternating current (AC) system is necessary. This is because reaching the governed speed indicates that the generator is operating at its optimal speed and power output. Resetting the AC system ensures that any potential issues or malfunctions are resolved and the system is ready to provide a stable and reliable power supply. Connecting power cables, adjusting governed speed, or connecting the bleed air duct are not mentioned as necessary actions at this point.

The cooling air for the transformer rectifier in a gas turbine engine is provided by the cooling fan. The cooling fan helps to regulate the temperature of the transformer rectifier by circulating air and preventing overheating. This ensures that the transformer rectifier operates efficiently and avoids any potential damage due to excessive heat.

During the operation of a turbine engine, fuel and air are mixed and ignited in the combustor can. The combustor can is a chamber where the fuel and air mixture is ignited, creating a high-energy combustion process. This combustion produces hot gases that expand and flow through the turbine, generating thrust or power. The combustor can is designed to withstand high temperatures and pressures, ensuring efficient combustion and safe operation of the turbine engine.

The radiator holds a large amount of coolant in close contact with a large volume of air. It is designed to dissipate heat from the coolant by transferring it to the surrounding air. The radiator consists of a series of tubes and fins that allow the coolant to flow through them, while the air passes over the fins, facilitating the exchange of heat. This design maximizes the surface area of contact between the coolant and air, allowing for efficient cooling of the engine.

When a lubricant deposits particles of dirt in the oil sump, it is performing the function of cleaning. This means that the lubricant is removing or carrying away the dirt particles from the engine components and depositing them in the oil sump. This helps to prevent the dirt particles from causing damage or increasing friction within the engine, ensuring that the engine operates smoothly and efficiently.

Air-oil seals are used to prevent oil loss into the airflow system during turbine engine operation. These seals create a barrier between the oil and the airflow, ensuring that oil does not leak into the system. This is important because oil in the airflow can cause damage to the engine components and affect its performance. The air-oil seals help to maintain the integrity of the oil system and ensure that oil is properly contained within the engine.

The correct answer is mechanical. This is because injectors operated by a rocker arm are typically mechanical injectors. These injectors use a mechanical linkage, such as a rocker arm, to open and close the injector valve. This type of injector is commonly found in older diesel engines and relies on the mechanical movement of the rocker arm to control the fuel injection process.

If the gas turbine compressor (GTC) load control butterfly valve opens too slowly or too quickly, the most probable cause of the malfunction is a maladjusted rate adjustment screw. The rate adjustment screw is responsible for controlling the speed at which the butterfly valve opens or closes. If it is not properly adjusted, it can result in an incorrect rate of opening or closing, leading to the valve opening too slowly or too quickly. This can cause issues with the overall operation and efficiency of the gas turbine compressor.

The stator windings of a synchronous motor are spaced 120 degrees apart. This is because a synchronous motor is designed to produce a rotating magnetic field in the stator. In order to achieve a smooth and continuous rotation, the stator windings are evenly spaced around the stator core. A spacing of 120 degrees ensures that the magnetic field produced by each winding overlaps and combines effectively, resulting in a rotating magnetic field that can drive the rotor of the motor.

During a preoperational inspection of a gas turbine engine, it is important to check the intake and exhaust for foreign objects. This is because foreign objects such as debris, dust, or small particles can enter the engine and cause damage to the internal components. It is necessary to remove any foreign objects to ensure the engine operates smoothly and efficiently. Checking for leakage, excess heat, and hairline cracks are also important aspects of the inspection, but in this case, the primary concern is foreign objects.

The portable load bank is designed to simulate the maximum alternating current (AC) resistive load that a generator can handle. The given answer, 75 kilowatts, indicates that the load bank can apply this maximum load to the generator. This means that the generator should be able to handle a resistive load of up to 75 kilowatts without any issues or overload.

Torque is defined as rotational force. It is the measure of the force that can cause an object to rotate around an axis. Torque is calculated by multiplying the force applied to an object by the distance from the axis of rotation. It is commonly used in physics and engineering to describe the twisting or turning effect produced by a force.

When checking the concentricity of a commutator or slip rings, the focus should be on roundness. This means examining whether the shape of the commutator or slip rings is perfectly circular or not. If there are any irregularities or deviations from a round shape, it could indicate potential issues with the equipment. Wear, pitting, and overheating are also important factors to consider when inspecting commutators or slip rings, but in this case, the correct answer specifically relates to checking for roundness.

The three-phase induction motor does not require a starting device because it is a self-starting motor. It uses the principle of electromagnetic induction to generate a rotating magnetic field in the stator, which then induces currents in the rotor. These currents create a magnetic field in the rotor, causing it to rotate and start the motor. Therefore, there is no need for any external starting device like a starter motor or a capacitor to initiate the motor's operation.

The boost pump on the gas turbine engine is responsible for supplying fuel to the main fuel pump. The main fuel pump then further pressurizes the fuel and delivers it to the combustion chamber. The fuel atomizer is not directly supplied by the boost pump, and the fuel air mixture valve is not mentioned in the context of fuel supply. Therefore, the main fuel pump is the correct answer as it receives fuel from the boost pump and ensures proper fuel delivery to the combustion chamber.

The correct answer is "a decrease in vibration after 35 percent." This suggests that the normal acceleration characteristics of the gas turbine compressor (GTC) involve a reduction in vibration levels after reaching 35 percent of its operational capacity. This decrease in vibration indicates a smoother and more stable acceleration process, which is desirable for the efficient and reliable operation of the GTC.

When oil enters the airflow system of a gas turbine compressor (GTC), it can cause gray or white smoke to pour from the exhaust stack. This is because the oil burns in the combustion chamber, resulting in the smoke being expelled through the exhaust. Excessive engine revolutions per minute (rpm) and excessive engine exhaust temperature may cause other issues in the engine but are not directly related to the smoke from the exhaust stack. Fuel mixing with the airflow is also unlikely to cause smoke, as it is a normal part of the combustion process.

Impellers are rotating components in a gas turbine engine that are responsible for accelerating the air. They are typically located in the compressor section of the engine and play a crucial role in compressing the incoming air before it enters the combustion chamber. By rotating at high speeds, the impellers create a high-pressure area, which causes the air to be accelerated and compressed. This increased pressure and velocity of the air are essential for efficient combustion and overall engine performance. Therefore, impellers are the correct answer for this question.

When using a troubleshooting chart, you are not likely to find analysis. A troubleshooting chart is a tool used to systematically identify and resolve issues or problems. It typically provides a step-by-step process to follow, listing symptoms, probable causes, and remedies. The purpose of a troubleshooting chart is to guide the user through the problem-solving process by providing a structured approach. Analysis, on the other hand, involves a deeper examination and evaluation of the problem, which may require additional tools or techniques beyond what a troubleshooting chart offers.

Before using the EPU-6/E frequency converter, it is important to inspect the air inlets for blockage. This is necessary to ensure proper airflow and prevent any obstructions that could affect the performance and efficiency of the converter. Blockages in the air inlets can restrict the flow of air, leading to overheating and potential damage to the converter. Therefore, checking for blockages is essential before using the EPU-6/E frequency converter.

When performing a compression test, the maximum allowable deviation between cylinders is 25 psi. This means that the pressure reading for each cylinder should not differ by more than 25 psi. If the deviation exceeds this limit, it could indicate a problem with the engine, such as worn piston rings or valves. Therefore, it is important to ensure that the compression levels are relatively consistent across all cylinders.

The oil pressure switch is responsible for preventing gas turbine compressor (GTC) operation with insufficient oil pressure. It is designed to monitor the oil pressure and signal the system to shut down if the pressure falls below a certain threshold. This is crucial for the proper functioning and protection of the GTC, as insufficient oil pressure can lead to damage and failure of the compressor. The oil pressure switch acts as a safety mechanism to ensure that the GTC only operates when the oil pressure is at an appropriate level.

When the A/M32A-60A generator set shuts down due to low fuel, the fuel level relay, K4, needs to be reset. The correct way to reset it is by turning the master switch OFF, then ON. This action will reset the relay and allow the generator set to start again once fuel is replenished. It is important to note that turning the start switch OFF, then ON, de-energizing the low-level lockout relay, or de-energizing the low-level warning switch will not reset the fuel level relay and may not resolve the low fuel issue.

The A/M24T-8 electrical test set is capable of applying both reactive and resistive loads to a generator under test. This means that the test set can simulate a variety of electrical conditions and evaluate the performance of the generator under different load scenarios. By applying reactive loads, which consist of both inductive and capacitive components, and resistive loads, the test set can accurately assess the generator's ability to handle different types of electrical loads.

Before operating any aerospace ground equipment (AGE), it is important to perform a preoperational inspection. This inspection allows you to check the equipment for any potential issues or malfunctions before use. It ensures that the equipment is in proper working condition and ready for operation. By conducting a preoperational inspection, you can identify and address any problems or concerns, ensuring the safety and efficiency of the equipment during operation.

To reverse the direction of rotation of a three-phase inductive motor, you must reverse any two power leads. This is because the direction of rotation is determined by the sequence of the phase currents. By reversing any two power leads, the sequence of the phase currents is also reversed, resulting in a change in the direction of rotation of the motor. Reversing all three phases or reversing only the A and B phases or B and C phases would not achieve the desired change in rotation direction.

The 110 percent centrifugal switch is the component of the A/M32A-60A generator electrical system that stops the engine in the event of an overspeed condition. When the engine reaches a speed of 110 percent of its rated RPM, the centrifugal force causes the switch to activate, cutting off the fuel supply and shutting down the engine. This safety mechanism helps prevent damage to the generator and ensures safe operation.

The oil pressure switch is a safety device that monitors the oil pressure in the A/M32A-60A during its operation. If the switch opens, it indicates that there is a problem with the oil pressure, which could potentially lead to damage or failure of the equipment. Therefore, regardless of the specific percentage range, if the oil pressure switch opens at any point during the operation, it will stop the operation of the A/M32A-60A to prevent further damage or malfunction.

A motor is a device that converts electrical energy into mechanical energy. It uses the principle of electromagnetism to generate a rotating motion, which can be used to perform mechanical work. In contrast, a generator is used to convert mechanical energy into electrical energy, a converter is used to change the form of electrical energy, and an inverter is used to convert DC (direct current) to AC (alternating current) or vice versa. Therefore, the purpose of changing electrical energy to mechanical energy is achieved by a motor.

To supercharge a diesel engine, the overlap and timing of the intake and exhaust valves need to be changed so that they are open at the same time. This allows for better air intake and exhaust flow, increasing the engine's power and efficiency. By having the valves open simultaneously, more air can be brought into the combustion chamber, resulting in improved combustion and increased horsepower. This modification helps to optimize the engine's performance and maximize its power output.

The correct answer is "before final reassembly of the enclosure." This means that the operational check should be performed after removing the defective part and before putting the unit back together. Performing the check at this stage ensures that any issues or problems can be identified and addressed before the enclosure is fully assembled, making it easier to fix any potential problems.

During a phase-one periodic inspection (PE), the purpose is to conduct a streamline inspection to ensure that a unit is operational and serviceable. This implies that the inspection will focus on verifying the functionality and overall condition of the equipment, rather than performing a detailed annual inspection. The goal is to quickly check the equipment's condition and ensure that it is in a state where it can be used effectively and safely.

The power for starting the A/M32A-60A is provided by batteries. This means that the batteries supply the necessary electrical energy to start the A/M32A-60A. The other options, such as generator, start switch, and master switch, are not mentioned as sources of power for starting the A/M32A-60A in the given question.

In a turbine engine, the energy from the burning gases is extracted by the turbine wheel and exducer. The turbine wheel is responsible for converting the kinetic energy of the gases into rotational energy, which is then used to power the compressor and other components of the engine. The exducer, on the other hand, helps to direct the flow of exhaust gases out of the engine. Together, these components play a crucial role in extracting energy from the burning gases and ensuring the efficient operation of the turbine engine.

When you operate a unit to determine the validity of an entry on the maintenance record form, you are performing the step of verification in effective troubleshooting. Verification involves confirming the accuracy or truthfulness of information or data. In this context, it means checking the entry on the maintenance record form to ensure its validity and correctness. This step helps in ensuring that the maintenance records are accurate and reliable for future reference and decision-making.

The correct answer is ACTIVATE because the question is asking about the position of the alarm switch on the EPU-6/E frequency converter prior to operation. "ACTIVATE" implies that the alarm switch needs to be turned on or enabled before the operation can proceed.

If there is no oil pressure and the oil filter is dirty, changing the oil filter will not correct the problem because the oil pressure relief valve is stuck open. The oil pressure relief valve is responsible for regulating the oil pressure in the system. If it is stuck open, it will allow oil to bypass the filter, resulting in low or no oil pressure. Changing the oil filter will not address the issue with the relief valve and therefore will not solve the problem.

The correct answer is 95 percent switch has closed. This means that the generator set cannot be loaded until the 95 percent switch has been closed. This switch is likely a safety measure to ensure that the generator is operating at a sufficient capacity before it can be loaded electrically or pneumatically. Once the 95 percent switch is closed, it indicates that the generator is operating at a high enough level to handle the load.