Aerospace Ground Equipment CDC Vol. 4

Repair of ground heater equipment should never be attempted unless accurate technical data is available. This is because accurate technical data provides the necessary information and instructions to safely and effectively repair the equipment. Without accurate technical data, there is a risk of causing further damage or injury to oneself or others. It is important to have access to the correct information and guidelines before attempting any repairs on ground heater equipment.

The correct answer is British Thermal Unit. British Thermal Unit (BTU) is a unit of measurement for heat energy. It represents the amount of heat required to raise the temperature of one pound of a substance by one degree Fahrenheit. Sensible heat refers to the heat that can be sensed or measured, specific heat is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius, and latent heat is the heat absorbed or released during a phase change without a change in temperature.

During an operational check of the MJ-1B bomblift, all hydraulic components should exhibit a smooth movement with no binding or jumping. This means that the components should move seamlessly without any resistance or sudden jerks. This is important for the proper functioning and safety of the bomblift. If there is any binding or jumping, it could indicate a malfunction or potential issues with the hydraulic system, which would need to be addressed to ensure the bomblift operates effectively.

A mesh screen prevents large particles in the fluid from entering the reservoir when servicing the hydraulic cart. It acts as a filter, allowing only smaller particles and clean fluid to pass through while trapping larger particles. This helps maintain the cleanliness of the fluid and prevents any potential damage to the hydraulic system caused by debris or contaminants.

When filling and bleeding the hydraulic test stand, the system should be pressurized and bled until a solid line of fluid can be seen in the sight tube. This indicates that there are no air bubbles present in the system and the hydraulic fluid is filling the sight tube completely. This ensures that the system is properly pressurized and bled, ready for operation.

The correct answer is 30 psi oil pressure is registered on the engine oil pressure gauge. This means that 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. Releasing the start switch, warming up the engine, or the engine starting are not the correct conditions for starting the air conditioner.

The correct answer is unit manufacturer's TO. Test procedures for a particular component can be found in the unit manufacturer's technical order (TO). This document provides detailed instructions on how to perform tests, inspections, and maintenance procedures for specific components. It is a comprehensive guide that ensures proper handling and operation of the component, providing step-by-step instructions for testing and troubleshooting. The TO is typically provided by the manufacturer and is an essential resource for technicians and operators to ensure the component's proper functioning and reliability.

The ammeter is the correct answer because it is a component that measures the current flowing through the electrical system. When the alternator is charging, it will produce a current that can be observed on the ammeter. This visual indication allows the technician to confirm that the alternator is functioning properly and providing the necessary charge to the electrical system. The voltmeter, headlight, and control panel light are not directly related to monitoring the charging of the alternator.

The SGNSC nitrogen booster compressor should stop at a storage cylinder pressure of 4400 psig.

A hand-operated cable is used to raise the mast on the FL-1D. This suggests that there is a mechanism in place that allows for manual control and operation of the cable, which in turn raises the mast. This method is likely chosen for its simplicity and reliability, as it does not rely on complex machinery or external power sources such as pneumatic controls or hydraulic cylinders.

Superheat refers to the heat added to a gaseous substance beyond its boiling point or saturation temperature. It is the amount of heat energy required to completely convert a substance from its liquid state to a gaseous state at a constant temperature. Sensible heat refers to the heat added or removed from a substance that causes a change in its temperature, while specific heat is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius. Latent heat, on the other hand, is the heat energy absorbed or released during a phase change without a change in temperature.

To check the backup hydraulic system on the MHU-83C/E bomblift, you need to operate the hand pump. This is because the hand pump is responsible for manually pressurizing 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 be relied upon if needed.

Prior to raising or lowering the mast from the vertical to horizontal position on the FL-1D, you must position the towbar to the left or right. This is important because the towbar needs to be in a specific position to ensure proper stability and balance when raising or lowering the mast. By positioning the towbar to the left or right, it allows for a smooth and controlled movement of the mast without putting unnecessary strain on the equipment.

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 and maintain a constant pressure on one side of the lifting arms, ensuring that they remain in the extended position even if there is a loss of hydraulic pressure. By providing a counterbalancing force, the valve prevents the arms from collapsing and ensures the stability and safety of the bomblift during operation.

Inward leaks occur when the pressure within the refrigeration system is less than atmospheric pressure. This means that air or other substances from the outside are being drawn into the system, causing a leak. Vacuum leaks, pressure leaks, and outward leaks are not correct because they do not accurately describe the type of leak that occurs when the pressure within the system is less than atmospheric pressure.

The correct answer is that the inside temperature reaches 140 degrees F. This means that the main air fan of the New Generation heater will start functioning once the temperature inside the heater reaches 140 degrees F. The other options mentioned, such as selecting a heat setting, establishing a constant flame, or the temperature gauge reading COOL, do not indicate when the main air fan will start.

Using starting aids to start the New Generation Heater can result in serious engine damage. Therefore, it is advised to never use starting aids for this purpose.

When performing refrigerant recovery, it is important to use vacuum pumps. Vacuum pumps are used to remove air and moisture from the refrigerant system, ensuring that the system is free from contaminants. This helps to maintain the efficiency and performance of the refrigerant system. By using vacuum pumps, any remaining air and moisture can be eliminated, reducing the risk of damage to the system and ensuring proper operation.

The air compressor in the SCNSC is categorized as high-pressure because it is designed to generate and deliver air at a high pressure level. This means that it can produce compressed air with a greater force, making it suitable for applications that require high-pressure air, such as pneumatic tools or industrial processes that demand a strong air flow.

The MA-3D aftercooler system uses an ethylene glycol/water solution to carry heat away from the conditioned air stream. This solution is commonly used as a coolant in various systems due to its high heat capacity and low freezing point. By circulating the ethylene glycol/water solution through the aftercooler system, heat is absorbed from the air stream and transferred to the solution, effectively cooling the air before it is released. This solution is preferred over other options like liquid or gaseous refrigerant or pure water solution due to its superior heat transfer properties.

The MC-2A rotary vane compressor is cooled using oil. Oil is commonly used in compressors as a cooling medium because it has excellent heat transfer properties. It absorbs the heat generated during compression and carries it away, preventing the compressor from overheating. Oil also helps lubricate the moving parts of the compressor, reducing friction and wear. Using oil as a cooling medium ensures efficient and reliable operation of the MC-2A rotary vane compressor.

If there is a discrepancy between the workcards and the technical order (TO), it is recommended to refer to the workcards. The workcards are specific instructions or procedures that are tailored to a particular task or job. They provide detailed information and steps that need to be followed to complete the task correctly. In contrast, the TO is a more general document that provides overall guidance and instructions for various tasks. Therefore, in case of a discrepancy, it is more reliable to rely on the workcards as they provide more specific and detailed instructions for the task at hand.

The oil in the rotary vane compressor forms a seal between the vanes and the stator. This is important because it prevents any leakage of air or gas between the vanes and the stator, ensuring efficient compression. Without this seal, the compressor would not be able to build up high pressure and function properly.

The B-4 adjustable aircraft maintenance platform utilizes a scissor mechanism to raise and lower the platform. The scissor mechanism consists of a series of linked bars or arms that pivot and move in a scissor-like motion, allowing the platform to be adjusted to different heights. This mechanism is commonly used in various types of lifting equipment due to its stability and ability to provide a wide range of height adjustments.

The separation membrane is the component on the SGNSC that removes nitrogen from the ambient air. This membrane is designed to selectively allow the passage of nitrogen molecules while blocking other gases. By using this membrane, nitrogen can be separated from the air, allowing for the production of nitrogen gas.

The pressure applied is the factor that has the greatest bearing on the temperature of a refrigerant. When pressure is applied to a refrigerant, it affects its boiling point and the amount of heat required for it to change from a liquid to a vapor. Increasing the pressure raises the boiling point and requires more heat to be applied for the refrigerant to reach its boiling point. Conversely, decreasing the pressure lowers the boiling point and requires less heat. Therefore, the pressure applied is a crucial factor in determining the temperature of a refrigerant.

Oil-moisture traps are necessary on a multi-stage reciprocating compressor to remove moisture from the compressed air. As the air is compressed, it tends to hold more moisture, which can cause damage to the compressor and downstream equipment. The oil-moisture traps work by capturing and separating the moisture from the compressed air, preventing it from entering the system. This helps to ensure the efficiency and longevity of the compressor and other components by eliminating the potential for corrosion and water damage.

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 regulates the amount of air that is being circulated and allows the operator to adjust it according to their preference. By turning the airflow control switch, the operator can increase or decrease the amount of air coming out of the unit, thereby controlling the overall volume of air.

To verify if a malfunction exists when a unit comes in with a write-up, the most effective approach is to operate the unit. By physically operating the unit, one can observe its behavior and determine if there are any issues or malfunctions. This hands-on approach allows for a direct assessment of the unit's performance and helps in identifying the root cause of the problem. Analyzing the problem and giving several probable causes can be done after operating the unit to further diagnose and troubleshoot the malfunction. Performing a service inspection may also be necessary, but it is not the initial step in verifying the existence of a malfunction.

The temperature controller on the MA-3D air conditioner receives input from sensors for suction pressure and leaving air temperature. This component is responsible for monitoring and adjusting the temperature of the air being circulated by the air conditioner. By receiving input from sensors, the temperature controller can accurately regulate the cooling process to maintain a desired temperature in the room.

When performing maintenance on the SGNSC, safety is important to keep in mind. This means taking necessary precautions to ensure the well-being and protection of individuals involved in the maintenance process. Safety measures may include wearing appropriate personal protective equipment, following proper procedures, and being aware of potential hazards. By prioritizing safety, the risk of accidents or injuries can be minimized, creating a safer working environment for everyone involved.

The throttle assembly is responsible for providing manual speed adjustment on the AF/M32T-1 cabin leakage tester. It controls the flow of fuel and air to the engine, allowing the operator to increase or decrease the speed as needed. This component is essential for controlling the tester's performance and ensuring accurate measurements of cabin leakage.

Sensible heat refers to the heat that can be felt and added or subtracted to a substance without changing its state. Unlike latent heat, which is associated with phase changes, sensible heat affects the temperature of a substance. Specific heat, on the other hand, is the amount of heat required to raise the temperature of a substance by a certain amount. Therefore, the correct answer is sensible heat.

When pressure increases, it raises the boiling point of a liquid. This is because an increase in pressure compresses the gas phase above the liquid, making it harder for bubbles to form and escape. As a result, more heat is required to overcome the increased pressure and reach the boiling point. Conversely, when pressure decreases, it lowers the boiling point because there is less resistance for bubbles to form and escape, requiring less heat to reach the boiling point.

The relief valve prevents overpressurization of the steering system of the MJ-1B bomblift. When the pressure in the system exceeds a certain limit, the relief valve opens to release the excess pressure, ensuring that the system does not become overpressurized. This helps to maintain the proper functioning and safety of the steering system.

The probable cause of the malfunction is that the warming door is not lowered for cold weather operating conditions. This could prevent the engine from reaching the required nitrogen purity within 30 minutes.

When verifying the proper operation of the centering mechanism on the MHU-83C/E bomblift, the unit should not move in neutral. This means that when the centering mechanism is being tested, the bomblift should remain stationary when the controls are in the neutral position. This is important because the centering mechanism is responsible for keeping the bomblift stable and centered while loading or unloading bombs. If the unit moves in neutral, it indicates a malfunction in the centering mechanism, which could lead to unsafe conditions during bomb handling operations.

The emergency switch, when turned to the OFF position, will prevent all control console functions except platform lowering and engine operation. This switch is specifically designed to be used in emergency situations where the platform needs to be lowered or the engine needs to be operated while disabling other control functions.

The heat control switch is the component on the New Generation Heater that activates the HCU. This switch is responsible for controlling the temperature settings of the heater and when it is turned on, it sends a signal to the HCU to start the heating process. The oil pressure switch is not directly involved in activating the HCU, the burner control unit is responsible for regulating the fuel flow to the burner, and the thermostatic sensor is used to measure the temperature of the heater but does not directly activate the HCU.

The oil pressure switch is responsible for monitoring the oil pressure in the engine system. In the event of an engine system malfunction where the oil pressure drops below a certain level, the oil pressure switch will activate the warning horn to alert the operator. This is an important safety feature as low oil pressure can indicate potential engine damage or failure, and immediate action may be required to prevent further damage or accidents.

The stair support linkage on the B-1 adjustable aircraft maintenance platform allows the work platform and steps to remain parallel to the base at any desired platform height. This means that as the platform is adjusted to different heights, the stair support linkage ensures that the steps remain level and parallel to the base, providing stability and safety for the workers using the platform.

The head adapter assembly of the towbar has a screw actuated fork assembly that is used to engage or disengage the aircraft nose gear. This means that the head adapter assembly is responsible for connecting the towbar to the aircraft's nose gear, allowing it to be lifted or lowered as needed. The other options, such as the main tube assembly, extension tubes, and lift actuator, do not specifically mention a screw actuated fork assembly or its role in engaging or disengaging the nose gear.

During the transportation of LOX carts, the vent valve should be in the closed position. This is because LOX (Liquid Oxygen) is highly reactive and can cause combustion or explosion in the presence of certain materials. By keeping the vent valve closed, it helps to prevent any accidental release or leakage of the LOX, ensuring the safety of the transportation process.

A restriction in a refrigerant system can be identified by observing frosting at the outlet. When there is a restriction, the flow of refrigerant is hindered, causing a decrease in pressure and temperature. This leads to the formation of frost on the outlet. Therefore, the presence of frosting indicates that there is a restriction in the system.

When disconnecting a line, it is important to ensure there is no pressure in the system. This is crucial for safety reasons as disconnecting a pressurized line can result in the release of hazardous substances or cause injury. By ensuring there is no pressure in the system before disconnecting the line, potential accidents can be prevented.

The correct answer is 250 lbs or 500 lbs. This means that the davit on the maintenance platform has two lifting capabilities: it can lift objects weighing either 250 lbs or 500 lbs.

To start the SGNSC (Starter-Generator Non-Start Control), the operator must place the ignition switch in the start position for no more than 10 seconds. This time duration is important to prevent damage to the starter-generator system. If the ignition switch is held in the start position for too long, it can cause overheating and potential failure of the starter-generator. Therefore, it is crucial to follow the recommended time limit of 10 seconds to ensure proper functioning and longevity of the SGNSC.

After the refrigerant leaves the compressor, it goes through the oil separator to remove any oil that may have mixed with it. Then, it enters the condenser coils. The condenser coils are responsible for transferring heat from the refrigerant to the surrounding air, causing the refrigerant to condense into a liquid. This process releases heat and allows the refrigerant to cool down. Therefore, the correct answer is condenser coils.

The expansion turbine is the component of the A/M32C-10D air conditioner that extracts energy from the bleed air on the air cycle machine. This turbine takes in the high-pressure, high-temperature air and expands it, converting the thermal energy into mechanical energy. This mechanical energy is then used to drive the air cycle machine, which cools and conditions the air for use in the air conditioning system. The expansion turbine plays a crucial role in the energy extraction process and is responsible for the efficient operation of the air conditioner.

If the position of the reservoir selector valve is changed in the hydraulic test stand during operation, it can cause a sudden change in the flow direction and pressure of the hydraulic fluid. This sudden change can lead to excessive pressure or turbulence within the flowmeter, causing it to be damaged.