2A672 Volume 2 Ure (Aircraft) Questions

The air inlets for blockage must be inspected prior to use in order to ensure proper functioning of the EPU-6/E frequency converter. If the air inlets are blocked, it can restrict the flow of air and lead to overheating of the components. Regular inspection of the air inlets will help prevent any potential blockages and ensure efficient operation of the frequency converter.

If the exhaust door is not opened and secured, the -95 will not be able to start. This is because the exhaust door allows for the release of exhaust gases from the turbine, which is necessary for the engine to function properly. If the door is not opened and secured, the exhaust gases will be trapped, leading to a buildup of pressure and preventing the engine from starting. Therefore, it is crucial to open and secure the exhaust door as a preliminary set-up step to ensure the -95 can start successfully.

Bubbles in an air conditioner refrigeration system sight glass probably indicate a low refrigerant charge. When there is a low refrigerant charge, the system does not have enough refrigerant to properly cool the air. This can lead to reduced cooling performance and the formation of bubbles in the sight glass. The bubbles indicate that the refrigerant is boiling or evaporating too quickly, which is a sign of low refrigerant levels.

The deswirl ring on the -95 gas turbine compressor is designed to smooth turbulent air flow. Turbulent air flow can cause inefficiencies and disruptions in the compressor's operation. The deswirl ring helps to eliminate or reduce turbulence, ensuring a more consistent and smooth flow of air through the compressor. This improves the overall performance and efficiency of the gas turbine compressor.

During the operation of the EPU-6/E frequency converter, if it is determined that the E and F pin voltage is not needed for the aircraft, the operator should place the Loop/bypass/28 V to aircraft switch in the Bypass position.

The ACE 802S air conditioner uses an air engine starter.

Air in the hydraulic system can cause erratic operation of the MJ-2A-1 hydraulic test stand. Air bubbles in the system can disrupt the flow of hydraulic fluid, leading to inconsistent and unpredictable performance. This can result in issues such as jerky movements, loss of pressure, and difficulty in controlling the equipment. To resolve this problem, it is necessary to bleed the air from the system and ensure that it is properly filled with hydraulic fluid.

The probable cause for the table on the MHU lift truck to tilt without changing the position on the control valve is a tilt cylinder leak. A tilt cylinder leak would result in the hydraulic fluid escaping from the tilt cylinder, causing a loss of pressure and control over the table's tilt function. This would explain why the table is tilting without any input from the control valve.

Inward leaks occur in a refrigeration system when the pressure within the system is less than atmospheric pressure. This means that the refrigerant is leaking from the surroundings into the system, causing the pressure to decrease. These leaks can be problematic as they can lead to a loss of refrigerant and a decrease in system efficiency. It is important to identify and fix inward leaks to maintain the proper functioning of the refrigeration system.

The thermal relief valve is designed to prevent thermal expansion of the hydraulic fluid from rupturing a hydraulic line. When the fluid temperature rises above a certain threshold, the thermal relief valve opens to release excess pressure, protecting the hydraulic system from potential damage. This component is crucial in maintaining the integrity and safety of the hydraulic system by preventing overpressure caused by thermal expansion.

The interstage seal is the correct answer because it is a component that isolates the second-stage air from the operation of the first-stage compressor. It prevents any leakage of air between the two stages and ensures that the second-stage air is not affected by the operation of the first-stage compressor. This helps in maintaining the efficiency and performance of the compressor.

The correct answer is "nothing, this is normal operation; the blower clutch energizes at governed speed". In this scenario, there is no need to take any action as the blower clutch will engage at the governed speed. The engine is operating at 1,250 rpm, but the blower clutch does not engage because it only energizes at the governed speed. Therefore, there is no issue with the air conditioner and no action is required.

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The auxiliary air system on the SGNSC provides low pressure air for pneumatic tools. This means that it supplies air at a lower pressure to be used in operating various pneumatic tools. This is important because pneumatic tools rely on compressed air to function properly, and having a separate system to provide low pressure air ensures that the tools receive the appropriate air pressure for their operation.

The fill switch, LS4, provides an alternate means of energizing the fill pump when either of the microswitches is defective. This means that if one of the microswitches malfunctions, the fill switch can be used as a backup to still activate the fill pump.

The air/fuel ratio is the correct answer because it refers to the ratio of air to fuel that is being supplied to the combustion section of the new generation heater (NGH). By adjusting the air/fuel ratio, the amount of air and fuel being mixed can be optimized to ensure complete combustion and prevent the formation of coke or carbon deposits. A proper air/fuel ratio helps to maintain efficient and clean combustion, reducing the risk of coking and improving the overall performance of the heater.

The probable cause of the trouble is the battery charging module. This module is responsible for regulating the charging rate of the battery. If the charging rate decreases to 12 amperes and the -95 does not shut down, it indicates a malfunction in the battery charging module, which is preventing the shutdown.

The heater/combustion section of the new generation heater (NGH) is operated by a 120 VAC power source.

The item manager and equipment specialist determine the length of time it is considered economically feasible to repair a piece of equipment. They have the expertise and knowledge to assess the cost of repair versus replacement, taking into account factors such as the age, condition, and availability of spare parts for the equipment. The supervisor, installation commander, and uniform repair/replacement board may provide input, but the final decision lies with the item manager and equipment specialist.

The air flowing through an air conditioner is referred to as the "heat load" because it carries the thermal energy that needs to be removed or transferred by the air conditioner. The heat load represents the amount of heat that needs to be removed from the space being cooled, and it is a crucial factor in determining the capacity and efficiency requirements of the air conditioning system.

The oil tank vent line prevents overpressurization of the bearing cavity on a -95. This is because the vent line allows excess pressure to escape from the oil tank, ensuring that the pressure within the bearing cavity remains at a safe level. Without the vent line, the pressure could build up and potentially cause damage to the bearing cavity.

At 100 percent engine speed, the discharge air pressure on the -95 should indicate 35 +2 psig.

When heat is applied to an ice cube and it starts to melt, the process is known as latent heat. Latent heat refers to the heat energy absorbed or released during a phase change, such as the transition from solid to liquid. In this case, the ice cube absorbs heat energy from its surroundings, causing the ice molecules to gain enough energy to break their bonds and transition into a liquid state. This process does not result in a change in temperature, as the heat energy is used to overcome the intermolecular forces holding the ice together rather than increasing the kinetic energy of the molecules.

The correct answer is conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between objects or substances. Convection is the transfer of heat through the movement of fluids or gases. Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. These three methods are the primary ways in which heat is transferred from one object to another.

The medium used to lubricate the engine starter on the ACE 802S air conditioner is fuel. Fuel is commonly used in engines as a lubricant to reduce friction and ensure smooth operation of the starter. It provides the necessary lubrication to prevent wear and tear on the engine components, allowing the starter to function effectively.

The correct answer is yaw movement. Yaw movement refers to the rotational movement of the lift truck cradle around its vertical axis. This movement is manually operated, meaning that it is controlled by the operator of the lift truck.

A loose push-on connector on the output filter capacitor could cause one phase voltage to be lower than the other two phases. When the connector is loose, it can result in a poor connection, leading to a decrease in voltage in that particular phase. This can disrupt the proper functioning of the frequency converter and cause the observed malfunction.

The ASM1 and ASM2 components separate the nitrogen from the oxygen.

The control transformer on the EPU-6/E frequency converter provides 120 VAC for the operation of the E and F line 28 VDC power supply. This means that the control transformer converts the incoming voltage to 120 VAC, which is then used to power the E and F line 28 VDC power supply. This allows the power supply to operate and provide the necessary 28 VDC power to the aircraft contactor.

The probable cause when the MJ-1B lift truck engine does not start is a blown 20 amp fuse.

When the ACE 802S compressor is in the HOLD position, the compressor displacement remains constant. This means that the amount of air being compressed and delivered by the compressor does not change while it is in the HOLD position.

When the butterfly valve is closed, chambers 1, 3, and 4 are pressurized. This means that the pressure is sealed off in these chambers and cannot escape. The other chambers, 2 and 5, are not pressurized because the butterfly valve is closed, preventing the flow of pressure into those chambers. Therefore, the correct answer is 1, 3, and 4.

The correct answer is compressor section. The compressor section of a gas turbine is responsible for supplying high-volume, low-pressure air for various purposes such as combustion, cooling, and bleed air output. It plays a crucial role in the overall functioning of the gas turbine by compressing the incoming air before it enters the combustion chamber. This compressed air is then mixed with fuel and ignited to produce the necessary power for the turbine. Additionally, the compressor section also provides air for cooling purposes and for other auxiliary systems in the turbine.

The correct answer is "RUN." In the RUN position, the engine switch energizes the electric fuel pump, fuel solenoid, and regulator. This allows fuel to be pumped into the engine and regulated properly for combustion. The other options, MODE, START, and DRIVE, do not perform this function.

The correct answer is the tilt control valve. During a load test of an MHU lift truck, the operator can change the level of the table by adjusting the tilt control valve. This valve controls the angle at which the table or platform of the lift truck is tilted, allowing the operator to raise or lower the load as needed. The longitudinal valve, latitudinal valve, and azimuth valve do not have a direct impact on changing the level of the table in this context.

The correct answer is air shutoff. Prior to starting the engine on the ACE 802S air conditioner system, the air shutoff valve must be opened. This valve controls the flow of air into the system and needs to be open for the engine to start and the air conditioner to function properly.

The heat boost system on the ACE802S air conditioner uses engine coolant to trim the output air temperature. Engine coolant is a liquid that circulates through the engine and absorbs heat. By utilizing the engine coolant, the air conditioner can adjust the temperature of the output air, providing a boost of heat when needed. This allows for more precise control over the air temperature and ensures optimal comfort for the user.

Vapor injection is the ACE 802S air conditioner system that "supercharges" the compressor. This technique involves injecting refrigerant vapor into the compressor, which helps to increase its efficiency and cooling capacity. By introducing vapor into the compressor, it helps to cool down the motor and prevents overheating, allowing the compressor to work more effectively. This results in improved performance and energy efficiency of the air conditioning system.

The oil pressure switch is a safety device in the MJ-2A-1 hydraulic test stand engine system that is responsible for sounding the warning horn in case of an engine system malfunction. This switch monitors the oil pressure in the engine and triggers the warning horn if the pressure drops below a certain threshold. This is important as low oil pressure can indicate a potential engine failure or other issues that need immediate attention to prevent further damage. The other options mentioned, such as the water level switch, fuel level indicator, and fuel pressure switch, are not directly related to monitoring engine system malfunctions and would not be responsible for sounding the warning horn.

The correct answer is "Analog board has failed." If there is an undervoltage fault problem with the EPU-6/E frequency converter unit, it suggests that there is an issue with the analog board. The analog board is responsible for controlling and regulating the voltage in the unit, so if it fails, it can result in an undervoltage fault.

The correct answer is B7 which steps open to meter R134a into the evaporator. When the output air temperature of the MA-3D air conditioner is too high, setting the temperature control to maximum cooling triggers the temperature controller to send a signal to B7. B7 then steps open to meter R134a into the evaporator. This action helps to cool down the air and lower the temperature.

The electric expansion valve is the component that controls the flow of refrigerant into the evaporator in an MA-3D air conditioner. It regulates the amount of refrigerant that enters the evaporator coil, allowing for precise control of the cooling process. By adjusting the opening of the valve, the electric expansion valve can ensure that the right amount of refrigerant is supplied to the evaporator, optimizing the cooling efficiency of the air conditioner.

A defective control cable could be the probable cause for the split deck maintenance platform not lowering. A control cable is responsible for transmitting the signals from the control panel to the platform's hydraulic system, which controls the lowering mechanism. If the control cable is defective or damaged, it may fail to transmit the necessary signals, resulting in the platform not lowering.

The photocell's resistance decreases in the presence of light. This means that when the flame in the burner tube is present and emitting light, the photocell's resistance will decrease. This change in resistance is used by the NGH to verify the presence of the flame.

AF Form 457 is used to report a hazardous condition. This form is specifically designed for reporting hazardous conditions in the Air Force. It allows personnel to document and report any unsafe or dangerous situations they come across in their work environment. By using this form, individuals can bring attention to potential hazards and take appropriate action to mitigate risks and ensure the safety of personnel and equipment.

The correct answer is Input auto transformer. The input auto transformer provides 525 VAC to the control transformer of the EPU-6/E frequency converter.

The first troubleshooting step that must be accomplished when a unit comes in with a write-up in the forms is to recognize the write-up as a malfunction. This means acknowledging that there is a reported issue or problem with the unit. By recognizing the write-up as a malfunction, the technician can then proceed with further steps to diagnose and address the specific problem.

Short cycling in an air conditioner occurs when the unit turns on and off too frequently, which can lead to inefficient cooling and increased wear and tear on the system. Checking the receiver outlet valve can help correct this issue because a faulty or clogged valve can cause improper refrigerant flow, leading to short cycling. By ensuring that the valve is functioning properly, the refrigerant flow can be regulated, allowing the air conditioner to operate more efficiently and prevent frequent cycling.

The probable cause of the engine not operating when the MA-3D air conditioner SW1 is in the START position is that the override switch is not closed.

The maintenance organization submits the AFTO Form 375 to MAJCOM HQ because MAJCOM HQ is responsible for overseeing and coordinating maintenance activities for the entire Major Command. By submitting the form to MAJCOM HQ, the maintenance organization ensures that the necessary information and updates regarding the maintenance of the equipment are communicated to the appropriate authority for further action and decision-making.