2A652 Volume 4 CDC Pretest

During the operation check of the MJ-1B bomblift, it is expected that all hydraulic components should exhibit movement only when actuated. This means that the components should only move when they are intentionally activated or operated. Additionally, there should be no jumping movements, which implies that the components should move smoothly without any sudden or erratic jumps. Furthermore, there should be no binding movements, indicating that the components should not experience any resistance or restriction in their movement. Therefore, the correct answer is "all of the above" as all these conditions should be met during the operation check.

Repairing ground heater equipment can be dangerous and should only be done if accurate technical data is available. This is because without proper technical data, one may not have the necessary information or instructions to safely repair the equipment. Accurate technical data ensures that the repair is carried out correctly and minimizes the risk of any further damage or accidents. It is important to have access to accurate technical data to ensure the safety and effectiveness of the repair process.

A good refrigerant should operate with low pressure to ensure safety and efficiency in the cooling system. It should also have a low boiling point so that it can easily evaporate and absorb heat from the surroundings. Additionally, it should not be poisonous to prevent any harm to humans or the environment. Therefore, the correct answer is "all of the above" as all these characteristics are essential for a good refrigerant.

The correct answer is a solid column of fluid can be seen in the sight tube. This means that the hydraulic system is properly pressurized and bled, and there are no air bubbles or contaminants present in the fluid. Seeing a solid column of fluid ensures that the system is ready for operation without any issues.

When a line is removed from a hydraulic test stand, it is important to replace it with the same type of line to ensure compatibility and proper functioning of the system. Additionally, making the location of the line ensures that it is correctly installed and connected in the appropriate position. Lastly, sealing all openings is necessary to prevent any leaks or pressure loss in the hydraulic system. Therefore, all of the above actions should be taken when a line is removed from a hydraulic test stand.

Superheat refers to the heat added to a gaseous substance above its boiling point or saturation temperature. This occurs when the substance is heated beyond its phase change point, causing it to exist in a gaseous state at a higher temperature than its boiling point. Superheating is commonly used in industrial processes to increase the efficiency of heat transfer or to prevent condensation in steam systems.

Phase I equipment inspection requires the inspection of only asterisked items in the workcards. This means that during Phase I inspection, only the items marked with an asterisk on the workcards are inspected. The other options, such as Annual, Service, and Phase II inspections, do not have this requirement.

The self generating nitrogen servicing cart (SGNSC) should stop producing nitrogen at a storage cylinder pressure of 4400 psig.

The counterbalance valve on the MJ-1B bomblift prevents collapsing of the cantilever lifting arms in the event of hydraulic pressure failure. This valve is designed to regulate the flow of hydraulic fluid, ensuring that the lifting arms remain stable and supported even if there is a loss of hydraulic pressure. By providing a counteracting force against the weight of the load, the counterbalance valve helps to maintain the integrity and safety of the lifting system.

A hand-operated cable is used to raise the mast on the FL-1D. This suggests that the mast is manually lifted using a cable that is operated by hand. The other options, such as screw mechanism, pneumatic controls, and hydraulic cylinder, imply the use of mechanical or automated systems to raise the mast, which is not the case here. Therefore, the hand-operated cable is the most appropriate and logical choice for raising the mast on the FL-1D.

Unit TO stands for Unit Technical Order. It is a document that provides detailed instructions and procedures for the maintenance and testing of specific components. It includes step-by-step instructions, diagrams, and specifications for conducting tests on the component. Therefore, if you are looking for test procedures for a particular component, you can find them in the Unit TO.

The periodic inspection (PE) section is contained in the Operation and service TO. This TO provides instructions and guidelines for the regular operation and maintenance of the equipment. The periodic inspection section specifically outlines the necessary inspections that need to be carried out at regular intervals to ensure the equipment's proper functioning and identify any potential issues or maintenance requirements.

Before performing maintenance on a liquid oxygen (LOX) cart, it is important to ensure that your tools are free of grease and oil and the cart is drained. This is crucial because LOX is highly reactive and can cause combustion when it comes into contact with flammable substances such as grease and oil. By ensuring that your tools are free of grease and oil, you minimize the risk of accidental ignition. Additionally, draining the cart ensures that there is no residual LOX present, further reducing the risk of combustion during maintenance.

The ammeter is the component that will give a visual indication that the alternator is charging. The ammeter measures the electrical current flowing through the system, and when the alternator is charging, it will show a positive reading on the ammeter. This indicates that the alternator is supplying power to the electrical system and charging the battery. The other options, voltmeter, headlight, and control panel light, do not directly provide information about the charging status of the alternator.

A mesh screen is used to prevent large particles in the fluid from entering the reservoir when servicing the hydraulic cart. The screen acts as a barrier, allowing only smaller particles and fluid to pass through while trapping larger particles. This helps to maintain the cleanliness of the hydraulic system and prevent any damage or clogging that could occur from the presence of large particles in the fluid.

Starting aids should never be used to start the New Generation Heater. This implies that the heater does not require any external assistance or additional starting aids to function properly.

The correct answer is "30 psi oil pressure is registered on the engine oil pressure gauge." This is because the air conditioner should only be started once the engine has reached a sufficient oil pressure of 30 psi. This ensures that the engine is properly lubricated and ready to operate the air conditioner. Holding the safety override switch until this pressure is registered helps prevent any potential damage or issues that may occur if the air conditioner is started without adequate oil pressure.

When performing a front end alignment on a nitrogen servicing unit, the component that would be adjusted to equalize the distance from each steering knuckle king pin to the center of the towbar lunette eye is the tie rod ends. The tie rod ends connect the steering knuckles to the steering rack, and by adjusting them, the distance from each king pin to the center of the towbar lunette eye can be equalized, ensuring proper alignment and stability of the unit.

The throttle is the component that provides manual speed adjustment on the AF/M32T-1 cabin leakage tester. This means that by adjusting the throttle, the operator can control the speed at which the tester operates. The throttle regulates the flow of fuel to the engine, which in turn determines the speed of the tester.

When performing maintenance on the self generating nitrogen servicing cart (SGNSC), it is important to prioritize safety. This means following proper safety protocols, wearing appropriate protective gear, and being aware of potential hazards. Safety should always be the top priority to prevent accidents or injuries during the maintenance process.

A fresh hydraulic leak will be oily and red because hydraulic fluid is typically red in color and has a lubricating property. When there is a leak, the fluid will come into contact with other surfaces, causing it to become oily.

To check the backup hydraulic system on the MHU83C/E bomblift, you need to operate the hand pump. This is because the hand pump is used to manually pressurize the hydraulic system when the main system is not functioning or in case of an emergency. By operating the hand pump, you can ensure that the backup hydraulic system is working properly and can provide hydraulic power when needed.

BTU stands for British Thermal Unit, and it is the amount of heat required to raise the temperature of one pound of a substance by one degree Fahrenheit. This unit is commonly used in the field of heating, ventilation, and air conditioning (HVAC) to measure the amount of heat energy needed to heat or cool a space. Therefore, BTU is the correct answer in this context.

The oil in the rotary vane compressor serves the purpose of forming a seal between the vanes and the stator. This seal is important to prevent any leakage of air or gas during the compression process. By creating a tight seal, the oil ensures that the compression is efficient and effective. Additionally, the oil helps to reduce friction and wear between the moving parts, thus prolonging the lifespan of the compressor. It is worth noting that the viscosity of the oil is high, which allows it to effectively maintain the seal, and it is also highly inflammable to ensure safety during operation.

The separation membrane is the component on the self-generating nitrogen servicing cart (SGNSC) that removes nitrogen from the ambient air. A separation membrane is a selective barrier that allows certain molecules or ions to pass through while blocking others. In this case, the separation membrane allows nitrogen to pass through, separating it from the other components present in the ambient air. This process helps in generating pure nitrogen for various applications.

The continuous movement of pressurized hydraulic fluid in the MJ-1B bomblift causes friction, which generates heat. As the fluid flows through the system, it comes into contact with various components, such as valves and cylinders, which also contribute to the heating process. Therefore, the correct answer is heated.

If the starter failed to operate on a bomblift, the first step you should take is to check the battery terminals and posts. This is because loose or corroded terminals can prevent the starter from receiving enough power to operate. By checking the battery terminals and posts, you can ensure that they are clean, tight, and free of any corrosion, allowing for proper electrical connection and potentially resolving the issue with the starter.

The mast erection crank can be used to relieve tension from the lock and disengage the latch from the striker plate on the FL-1D when lowering the mast. This crank allows for manual control and adjustment of the mast, providing a mechanism to release any tension and safely lower the mast without causing damage or injury.

The heat control switch is the component on the New Generation Heater that activates the heater control unit (HCU). When the heat control switch is turned on, it sends a signal to the HCU to start the heating process. This switch allows the user to control the temperature and turn the heater on or off as desired. The burner control unit, thermostatic sensor, and oil pressure switch are not responsible for activating the HCU.

The correct answer is "When the inside temperature reaches 140 F". The heater control unit (HCU) starts the main air fan for output air when the inside temperature reaches 140 F. This indicates that the heater has reached the desired temperature and is ready to distribute warm air throughout the space.

Inward leaks occur in a refrigeration system when the pressure within the system is less than atmospheric pressure. This means that air or other substances from outside the system are being drawn into the system, causing a decrease in pressure. Inward leaks can lead to a loss of refrigerant and a decrease in the system's efficiency.

The self-generating nitrogen servicing cart (SGNSC) is categorized as a high-pressure air compressor because it is designed to generate and deliver nitrogen at high pressures. Unlike low-pressure air compressors, which typically operate at pressures below 100 psi, the SGNSC is capable of producing nitrogen at pressures exceeding 100 psi, making it suitable for high-pressure applications such as aircraft maintenance and servicing. Its ability to generate nitrogen at high pressures allows it to meet the specific requirements of these applications, making it the correct answer choice.

The correct answer is "Unit should not move in neutral." This is because the centering mechanism on the MHU83C/E bomblift is designed to keep the unit stationary when it is in the neutral position. If the unit moves in neutral, it indicates a malfunction in the centering mechanism, which needs to be addressed and repaired for proper operation.

The special inspection requires the most tear down of specific components compared to the other types of inspections mentioned. This type of inspection involves a thorough examination and evaluation of specific components or systems that may require disassembly or removal to assess their condition or performance. The tear down is necessary to ensure a comprehensive inspection and to identify any potential issues or defects that may not be visible during a visual inspection.

The first step of troubleshooting heater equipment is recognition. This means identifying and acknowledging the problem or issue with the equipment. By recognizing the problem, one can then proceed to the next steps of troubleshooting, such as analysis, isolation, and verification. Recognition is crucial as it allows for a targeted and effective troubleshooting process, ensuring that the correct solutions are implemented to resolve the issue with the heater equipment.

Latent heat refers to the heat energy absorbed or released during a phase change of a substance, such as from solid to liquid or liquid to gas, without changing its temperature. This heat is used to break or form intermolecular bonds between particles, causing the substance to change its state. Unlike sensible heat, which affects the temperature of a substance, latent heat does not cause a change in temperature but is responsible for the transformation between different states of matter.

The airflow control switch on the MA-3D air conditioner allows the operator to control the overall volume of air leaving the unit. This switch is specifically designed to adjust the airflow and can be used to increase or decrease the amount of air being circulated by the air conditioner. By manipulating the airflow control switch, the operator can customize the cooling or heating effect according to their preference or the specific requirements of the environment.

The MC-2A rotary vane compressor is cooled using oil. Oil is commonly used in compressors as a cooling medium because it has good heat transfer properties and can effectively absorb and dissipate heat generated during the compression process. This helps to prevent the compressor from overheating and ensures its efficient operation. Additionally, oil also helps to lubricate the moving parts of the compressor, reducing friction and wear.

Before performing any maintenance on an air compressor airflow system, it is important to relieve all air pressure. This is necessary to ensure the safety of the person conducting the maintenance as well as to prevent any potential accidents or injuries. By relieving the air pressure, the risk of sudden release of compressed air is minimized, reducing the chances of accidents or damage to the system. It is a crucial step that should be followed to ensure proper maintenance procedures are carried out safely.

To charge the receiver on the MC-2A air compressor, it is necessary to close the receiver drain valve. This is because the receiver drain valve allows any accumulated moisture or condensation to be drained from the receiver. By closing the drain valve, it ensures that the receiver is sealed and ready to be charged with air. This step is important to maintain the efficiency and proper functioning of the air compressor.

The purpose of the low pressure pump on the MJ-2A-1 is to ensure a constant flow of fluid to the high pressure pump. The high pressure pump requires a consistent supply of fluid in order to function properly and generate the necessary pressure for the system. The low pressure pump helps to maintain this flow by providing a steady stream of fluid to the high pressure pump, ensuring its continuous operation.

When the engine of the MJ-1B bomblift starts, it is important to check for sufficient oil pressure. This is because oil pressure is crucial for the proper lubrication and functioning of the engine. Insufficient oil pressure could indicate a problem with the engine's oil system, which could lead to engine damage or failure if not addressed. Therefore, checking the oil pressure is a necessary step to ensure the engine is running smoothly and to prevent any potential issues.

The lifting mechanism on the towbar is designed to raise and lower the wheel assemblies. This allows for easy transportation and maneuverability of the equipment or vehicle being towed. By raising the wheel assemblies, the towbar can be attached or detached more easily, and the height of the equipment can be adjusted to match the towing vehicle. Lowering the wheel assemblies allows for stability and prevents any unnecessary movement or damage during transportation.

When analyzing an air compressor malfunction, it is best to start with the simplest possibilities as they are often the most common and easiest to fix. By ruling out simple causes first, such as a loose connection or low air pressure, you can quickly identify and resolve the issue without wasting time on more complex possibilities. This approach helps streamline the troubleshooting process and ensures that the problem is resolved efficiently.

The fill switch, LS4, provides an alternate means of energizing the fill pump when either of the micro switches are defective on the MJ-2A-1 hydraulic test stand. This means that if the micro switches, which are responsible for activating the fill pump, are not functioning properly, the fill switch can be used as a backup to ensure that the fill pump still receives power and can perform its function.

A tubing wrench should be used on brass or aluminum fittings because it provides a secure grip without damaging the soft metals. Adjustable wrenches, open end wrenches, and box end wrenches may not provide the same level of precision and could potentially cause damage to the fittings. Tubing wrenches are specifically designed with a smooth, rounded jaw that evenly distributes pressure, making them ideal for working with delicate materials like brass and aluminum.

One way to identify most hydraulic malfunctions is by looking for fluid under the unit. This is because if there is fluid leaking from the hydraulic system, it indicates a problem with the system's seals or connections. Fluid under the unit can also suggest a potential issue with the hydraulic cylinder or pump. Therefore, observing fluid under the unit can be a clear indicator of a hydraulic malfunction.

A phase 1 periodic inspection step refers to a specific maintenance task that is performed during the initial phase of inspection. In this case, the engine oil change is the correct answer as it is a routine maintenance procedure that is typically carried out during the first phase of inspection. This step involves draining the old engine oil and replacing it with fresh oil to ensure proper lubrication and functioning of the engine. It is an essential task to maintain the performance and longevity of the engine.

The B-4 adjustable aircraft maintenance platform is capable of reaching heights ranging from 3 to 7 feet. This means that the platform can be adjusted to various heights within this range to accommodate different maintenance tasks on aircraft. It provides a flexible and versatile solution for maintenance personnel to access different areas of the aircraft at a suitable working height.

The correct answer is "system voltage rises to 120 VAC". This means that the heat control switch should be turned to the desired position only after the system voltage has reached 120 VAC. This is important because the heater may not function properly or efficiently if it is turned on before the system voltage has reached the required level. Waiting for the system voltage to rise ensures that the heater will work effectively and provide the desired level of heat.