2A672 Volume 2 Ure (Aircraft) Questions

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  • 1/80 Questions

    What EPU-6/E frequency converter components must be inspected prior to use?

    • Air inlets for blockage
    • Wiring for secure mounting
    • Maintenance panels for corrosion
    • Interior air vents for secure mounting
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About This Quiz

A person aiming to become aerospace ground equipment journeyman is charged with diagnosing any malfunctions and repairing the equipment. Before they assign a person to repair the equipment they should ensure that they perform troubleshooting on the equipment. Give the question below on volume two a try before beginning on the next volume.

2A672 Volume 2 Ure (Aircraft) Questions - Quiz

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  • 2. 

    The function of the deswirl ring on the -95 gas turbine compressor is to

    • Accelerate air

    • Increase air pressure

    • Decrease air velocity

    • Smooth turbulent air flow

    Correct Answer
    A. Smooth turbulent air flow
    Explanation
    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.

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  • 3. 

    What preliminary set-up step, if skipped, prevents the -95 from starting?

    • Set-up controls

    • Set parking brakes

    • Open and secure the exhaust door

    • Ensure the turbine air inlet and exhaust doors are free of obstructions

    Correct Answer
    A. Open and secure the exhaust door
    Explanation
    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.

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  • 4. 

    Bubbles in an air conditioner refrigeration system sight glass probably indicate

    • Refrigerant overcharge

    • A low refrigerant charge

    • High discharge temperature

    • Low discharge air temperature

    Correct Answer
    A. A low refrigerant charge
    Explanation
    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.

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  • 5. 

    During operation of the EPU-6/E frequesncy converter it is determined that E and F pin voltage in not needed for the aircraft.  The operator places the Loop/bypass/28 V to aircraft switch to what position?

    • 28 V to aircraft

    • Neutral

    • Bypass

    • Loop

    Correct Answer
    A. Bypass
    Explanation
    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.

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  • 6. 

    What type of engine starter does the ACE 802S air conditioner use?

    • Air

    • Manual

    • Electric

    • Hydraulic

    Correct Answer
    A. Air
    Explanation
    The ACE 802S air conditioner uses an air engine starter.

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  • 7. 

    What condition causes erratic operation of the MJ-2A-1 hydraulic test stand?

    • Air in the system

    • Fill relief valve set too low

    • Thermal relief valve set too high

    • Overserviced hydraulic reservoir

    Correct Answer
    A. Air in the system
    Explanation
    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.

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  • 8. 

    During load testing, the table on the MHU lift truck starts to tilt without changing the position on the control valve.  What is the probable cause?

    • Tilt cylinder leak

    • Azimuth cylinder leak

    • Latitudinal cylinder leak

    • Longitudinal cylinder leak

    Correct Answer
    A. Tilt cylinder leak
    Explanation
    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.

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  • 9. 

    What -95 component isolates the second-stage air from the operation of the first-stage compressor?

    • Interstage ducts

    • Interstage seal

    • Impellers

    • Inducers

    Correct Answer
    A. Interstage seal
    Explanation
    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.

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  • 10. 

    The engine on the MA-3D air conditioner is operating at 1,250 rpm, but the blower clutch does not engage.  What do you do?

    • Replace SW2

    • Replace the engine speed control

    • Nothing, this is normal operation; the blower clutch energizes at governed speed

    • Check the MPU to make sure it's sending the proper signal to the engine speed control

    Correct Answer
    A. Nothing, this is normal operation; the blower clutch energizes at governed speed
    Explanation
    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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  • 11. 

    What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?

    • Vacuum leaks

    • Inward leaks

    • Outward leaks

    • Pressure leaks

    Correct Answer
    A. Inward leaks
    Explanation
    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.

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  • 12. 

    What MJ-2A-1 hydraulic test stand component prevents thermal expansion of the hydraulic fluid from rupturing a hydraulic line?

    • Heat exchanger

    • Temperature switch

    • Thermal relief valve

    • Low-pressure check/relief valve

    Correct Answer
    A. Thermal relief valve
    Explanation
    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.

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  • 13. 

    On the SGNSC, the auxiliary air system

    • Powers the booster compressor

    • Provides air to the feed air compressor

    • Provides low pressure air for pneumatic tools

    • Maintains 130 degreees F air temperature to prevent condensation

    Correct Answer
    A. Provides low pressure air for pneumatic tools
    Explanation
    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.

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  • 14. 

    A supervisor must document an NCO's safety training on AF Form

    • 2426

    • 623

    • 457

    • 55

    Correct Answer
    A. 55
  • 15. 

    The -95 does not shut down when the charging rate decreases to 12 amperes.  What is the probable cause of this trouble?

    • Air load switch

    • Fuel level relay K5

    • 2 speed solenoid SV4

    • Battery charging module

    Correct Answer
    A. Battery charging module
    Explanation
    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.

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  • 16. 

    What power source operates the heater/combustion section of the new generation heater (NGH)?

    • 12 VDC

    • 120 VAC

    • Hydraulic motor

    • Diesel engine only

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

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  • 17. 

    What adjustment on the new generation heater (NGH) prevents coking in the combustion section?

    • Fuel pressure

    • Air/fuel ratio

    • Igniter timing

    • Fuel spray pattern

    Correct Answer
    A. Air/fuel ratio
    Explanation
    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.

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  • 18. 

    What MJ-2A-1 hydraulic test stand switch provides an alternate means of energizeng the fill pump when either of the microswitches is defective?

    • Fill switch, LS4

    • Micro switch, FS1

    • Engine master switch

    • Soft start relay switch

    Correct Answer
    A. Fill switch, LS4
    Explanation
    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.

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  • 19. 

    Who determines the length of time it is considered economically feasible to repair a piece of equipment?

    • Supervisor

    • Installation commander

    • Uniform repair/replacement board

    • Item manager and equipment specialist

    Correct Answer
    A. Item manager and equipment specialist
    Explanation
    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.

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  • 20. 

    What prevents overpressurization of the bearing cavity on a -95?

    • Oil jet

    • Oil cooler

    • Scavenge pump

    • Oil tank vent line

    Correct Answer
    A. Oil tank vent line
    Explanation
    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.

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  • 21. 

    On the -95, discharge air pressure at 100 percent engine speed should indicate

    • 55 +2 psig

    • 45 +2 psig

    • 35 +2 psig

    • 25 +2 psig

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

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  • 22. 

    The air flowing through an air conditioner is also called

    • Heat

    • Heat load

    • Pounds per minute (ppm)

    • Cubic feet per minute (cfm)

    Correct Answer
    A. Heat load
    Explanation
    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.

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  • 23. 

    During operation of the EPU-6/E frequency converter you determine that one phase voltage is lower than the other two phases.  What could cause this malfunction?

    • Malfunctioning transister

    • Burnt control transformer fuse

    • Improper SCR firing adjustment

    • Loose push-on connector on the output filter capacitor

    Correct Answer
    A. Loose push-on connector on the output filter capacitor
    Explanation
    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.

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  • 24. 

    When heat is applied to an ice cube and the ice starts to melt, it is

    • Super heat

    • Latent heat

    • Sensible heat

    • Convection heat

    Correct Answer
    A. Latent heat
    Explanation
    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.

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  • 25. 

    The three methods of heat transfer are

    • Sensible, latent, and super heat

    • Sensible, convection, and conduction

    • Conduction, convection, and radiation

    • Conduction, convection, and super heat

    Correct Answer
    A. Conduction, convection, and radiation
    Explanation
    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.

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  • 26. 

    What medium is used to lubricate the engine starter on the ACE 802S air conditioner?

    • Air

    • Oil

    • Fuel

    • Coolant

    Correct Answer
    A. Fuel
    Explanation
    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.

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  • 27. 

    What MJ-1B lift truck cradle movement is manually operated?

    • Tilt movement

    • Yaw movement

    • Lateral movement

    • Longitudinal movement

    Correct Answer
    A. Yaw movement
    Explanation
    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.

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  • 28. 

    What SGNSC components separate the nitrogen from the oxygen?

    • ASM1, ASM2

    • CYL1, CYL2

    • FCV1, FCV2

    • PS1, TS4, TS5

    Correct Answer
    A. ASM1, ASM2
    Explanation
    The ASM1 and ASM2 components separate the nitrogen from the oxygen.

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  • 29. 

    The control transformer perform on the EPU-6/E frequency converter provides

    • 28 VDC for the aircraft contactor

    • 240 VDC for the aircraft contactor

    • 120 VAC for the operation of E and F line 28 VDC power supply

    • 240 VAC for operation of E and F line 28 VDC power supply

    Correct Answer
    A. 120 VAC for the operation of E and F line 28 VDC power supply
    Explanation
    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.

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  • 30. 

    What -95 gas turbine compressor section supplies high-volume, low-pressure air for combustion, cooling, and bleed air output?

    • Turbine section

    • Accessory section

    • Compressor section

    • Air regulator section

    Correct Answer
    A. Compressor section
    Explanation
    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.

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  • 31. 

    What -95 chambers are pressurized when the butterfly valve is closed?

    • 1 and 3

    • 2 and 4

    • 1, 2, and 3

    • 1, 3, and 4

    Correct Answer
    A. 1, 3, and 4
    Explanation
    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.

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  • 32. 

    When the ACE 802S compressor is in the HOLD position, what is the compressor displacement?

    • Errratic

    • Constant

    • Minimum

    • Maximum

    Correct Answer
    A. Constant
    Explanation
    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.

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  • 33. 

    What is the probable cause when the MJ-1B lift truck engine does not start?

    • 10 amp fuse

    • 20 amp fuse

    • Low oil pressure

    • Neutral start switch S3 is closed

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

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  • 34. 

    What valve must be opened prior to starting the engine on the ACE 802S air conditioner system?

    • Air shutoff

    • Fuel shutoff

    • Coolant control

    • Refrigerant control

    Correct Answer
    A. Air shutoff
    Explanation
    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.

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  • 35. 

    During a load test of an MHU lift truck, the operator changes the level of the table by changing the position of the

    • Longitudinal valve

    • Tilt control valve

    • Latitudinal valve

    • Azimuth valve

    Correct Answer
    A. Tilt control valve
    Explanation
    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.

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  • 36. 

    What split deck maintenance platform engine switch position energizes the electric fuel pump, fuel solenoid, and regulator?

    • RUN

    • MODE

    • START

    • DRIVE

    Correct Answer
    A. RUN
    Explanation
    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.

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  • 37. 

    What does the heat boost system on the ACE802S air conditioner use to trim output air temperature?

    • Air

    • Refrigerant

    • Engine coolant

    • Electric heater

    Correct Answer
    A. Engine coolant
    Explanation
    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.

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  • 38. 

    What ACE 802S air conditioner system "supercharges" the compressor?

    • Defrost

    • Heat boost

    • Vapor injection

    • Liquid injection

    Correct Answer
    A. Vapor injection
    Explanation
    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.

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  • 39. 

    What MJ-2A-1 hydraulic test stand engine system safety device sounds the warning horn in the event of an engine system malfunction?

    • Water level switch

    • Oil pressure switch

    • Fuel level indicator

    • Fuel pressure switch

    Correct Answer
    A. Oil pressure switch
    Explanation
    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.

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  • 40. 

    During operation you determine that there is an undervoltage fault problem with the EPU-6/E frequency converter unit.  What component could be malfunctioning?

    • Analog board has failed

    • Output trim potentiometer is centered

    • Voltage control board potentiometer is shorted

    • Audible alarm switch is in the silence position

    Correct Answer
    A. Analog board has failed
    Explanation
    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.

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  • 41. 

    What MA-3D air conditioner component controls refrigerant flow into the evaporator?

    • Quench valve

    • TXV solenoid valve

    • Hot gas bypass circuit

    • Electric expansion valve

    Correct Answer
    A. Electric expansion valve
    Explanation
    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.

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  • 42. 

    While you are operating on MA-3D air conditioner, the output air temperature is too high, so you set the temperature control to maximum cooling.  The temperature controller sends a signal to

    • B7 which steps closed to meter R143a into the evaporator

    • B7 which steps open to meter R134a into the evaporator

    • The quench valve which opens to aid in cooling

    • S1 and S2 which open to aid in cooling

    Correct Answer
    A. B7 which steps open to meter R134a into the evaporator
    Explanation
    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.

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  • 43. 

    While operating the split deck maintenance platform you realize that the platform will not lower.  What is the probable cause?

    • Corroded battery cables

    • A defective control cable

    • Main disconnect switch ON

    • Engine switch in RUN position

    Correct Answer
    A. A defective control cable
    Explanation
    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.

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  • 44. 

    Which of the following components provides 525 VAC to the control transformer of the EPU-6/E frequency converter?

    • Input auto transformer

    • Output auto transformer

    • Input phase sequence transformer

    • Output phase sequence transformer

    Correct Answer
    A. Input auto transformer
    Explanation
    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.

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  • 45. 

    While you are doing an ops check of an air conditioner, you notice the unit is short cycling.  What do you do to correct this trouble?

    • Increase the heat load

    • Lower the refrigerant charge

    • Check the receiver outlet valve

    • Decrease the setting of the LPCO

    Correct Answer
    A. Check the receiver outlet valve
    Explanation
    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.

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  • 46. 

    You place the MA-3D air conditioner SW1 in the START position, but the engine does not operate.  What is the probable cause of this trouble?

    • K7 contacts are closed

    • Overspeed switch is closed

    • Oil pressure switch is closed

    • Override switch is not closed

    Correct Answer
    A. Override switch is not closed
    Explanation
    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.

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  • 47. 

    What is the first troubleshooting step that must be accomplished when a unit comes in with a write-up in the forms?

    • Perform a service inspection

    • Perform an operational check

    • Verify the problem actually exists

    • Recognize the write-up as a malfunction

    Correct Answer
    A. Recognize the write-up as a malfunction
    Explanation
    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.

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  • 48. 

    How does the photocell on the new generation heater (NGH) verify the flame in the burner tube?

    • The photocell's thermal contacts open when heat increases

    • The photocell's thermal contacts close when heat increases

    • The photocell's resistance decreases in the presence of light

    • The photocell's resistance increases in the presence of light

    Correct Answer
    A. The photocell's resistance decreases in the presence of light
    Explanation
    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.

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  • 49. 

    Which form is used to report a hazardous condition?

    • AFTO Form 375

    • AF Form 457

    • AF Form 455

    • AF Form 55

    Correct Answer
    A. AF Form 457
    Explanation
    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.

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