An APU Quiz For All Aspiring Pilots And Plan Technicians Out There!

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An APU Quiz For All Aspiring Pilots And Plan Technicians Out There! - Quiz

An Auxiliary Power Unit or APU allows an aircraft to operate autonomously without reliance on ground support equipment such as a ground power unit, an external air-conditioning unit or a high pressure air start cart.
Take this quiz to check your knowledge about the same!


Questions and Answers
  • 1. 

    What are you waiting for during the two-minute period during shuhtdown of the APU?

    • A.

      Stabilization of the APU

    • B.

      The oil pressure to drop within limits

    • C.

      The bleed air ducts to cool down

    • D.

      The APU load control valve to fully shut

    Correct Answer
    A. Stabilization of the APU
    Explanation
    During the two-minute period during shutdown of the APU, you are waiting for the APU to stabilize. This means that all the systems and components of the APU need to reach a stable state before it can be safely shut down. This ensures that all the processes and functions of the APU have completed and there are no remaining tasks or operations that could be disrupted by the shutdown.

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  • 2. 

    What technical order covers the APU and it's operation?

    • A.

      1C-130H-2-05JG-00-1

    • B.

      1C-130H-2-49JG-00-1-1

    • C.

      1C-130H-2-12JG-10-2

    • D.

      1C-130H-2-71JG-00-1

    Correct Answer
    B. 1C-130H-2-49JG-00-1-1
    Explanation
    The correct answer, 1C-130H-2-49JG-00-1-1, is the technical order that covers the APU and its operation.

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  • 3. 

    The boost pump must be turned on when operating the APU with less than _______ pounds of fuel in the #2 tank

    • A.

      4,000

    • B.

      3,000

    • C.

      2,000

    • D.

      1,000

    Correct Answer
    C. 2,000
    Explanation
    The boost pump must be turned on when operating the APU with less than 2,000 pounds of fuel in the #2 tank. This is necessary to ensure a consistent fuel supply to the APU, as the boost pump helps to maintain adequate fuel pressure and prevent fuel starvation. Without the boost pump, there is a risk of the APU losing power and shutting down due to insufficient fuel supply.

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  • 4. 

    The minimum DC voltage for the aircraft's batteries are?

    • A.

      21

    • B.

      22

    • C.

      24

    • D.

      28

    Correct Answer
    A. 21
    Explanation
    The minimum DC voltage for the aircraft's batteries is 21. This means that the batteries should have a voltage of at least 21 volts to operate effectively in the aircraft.

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  • 5. 

    Where does the APU receive it's fuel from?

    • A.

      The APU fuel tank

    • B.

      The RH AUX tank

    • C.

      The #2 main tank

    • D.

      The fuel cross-feed manifold

    Correct Answer
    C. The #2 main tank
    Explanation
    The APU receives its fuel from the #2 main tank.

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  • 6. 

    Do not hold the agent discharge switch to #1 or #2 position for more than two seconds during emergency shutdown procedures, if there is a fire.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Holding the agent discharge switch to #1 or #2 position for more than two seconds during emergency shutdown procedures can be dangerous if there is a fire. This is because the agent discharge switch is used to release fire suppression agents, such as foam or gas, to extinguish the fire. If the switch is held for too long, it may lead to an excessive discharge of the agent, potentially causing more harm or spreading the fire. Therefore, it is important to follow the recommended time limit and release the switch promptly during emergency shutdown procedures.

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  • 7. 

    How is the APU fire detected?

    • A.

      A flashing fire warning light and a steady light in the T-Handle

    • B.

      A steady fire warning light and a steady light in the T-Handle

    • C.

      A steady fire warning light and a flashing light in then T-Handle

    • D.

      A flashing fire warning light and a flashing light in the T-Handle

    Correct Answer
    B. A steady fire warning light and a steady light in the T-Handle
    Explanation
    The APU fire is detected by a steady fire warning light and a steady light in the T-Handle. This indicates that there is a fire in the APU and immediate action needs to be taken to address the situation. The steady lights in both the fire warning light and the T-Handle indicate a continuous and serious issue that requires attention.

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  • 8. 

    The entire APU oil system hold approximately how many quarts of oil?

    • A.

      2 US quarts

    • B.

      3 US quarts

    • C.

      6 US quarts

    • D.

      5 US quarts

    Correct Answer
    C. 6 US quarts
    Explanation
    The correct answer is 6 US quarts. The APU (Auxiliary Power Unit) oil system holds approximately 6 US quarts of oil.

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  • 9. 

    What is the APU starter duty cycle?

    • A.

      1 minute on and 1 minute off

    • B.

      1 minute on and 2 minutes off

    • C.

      1 minute on and 3 minutes off

    • D.

      1 minute on and 4 minutes off

    Correct Answer
    D. 1 minute on and 4 minutes off
    Explanation
    The APU starter duty cycle refers to the time interval during which the APU starter is activated and the time interval during which it is deactivated. In this case, the correct answer is "1 minute on and 4 minutes off," indicating that the APU starter is turned on for 1 minute and then turned off for 4 minutes before being turned on again. This cycle is repeated to ensure proper functioning and prevent overheating or excessive wear of the APU starter.

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  • 10. 

    What happens at 35% RPM during APU starting?

    • A.

      The start light goes out

    • B.

      The start light comes on

    • C.

      The on speed light comes on

    • D.

      The on speed light goes out

    Correct Answer
    A. The start light goes out
    Explanation
    During APU starting, the start light indicates that the APU is in the process of starting up. At 35% RPM, the APU has reached a sufficient speed for it to continue running without assistance. Therefore, the start light goes out at this point, indicating that the APU has successfully started and is running smoothly.

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  • 11. 

    What happens at 95% RPM during APU starting?

    • A.

      The APU automatically shuts down

    • B.

      The over-speed light comes on

    • C.

      The on-speed light comes on

    • D.

      The on-speed light goes out

    Correct Answer
    C. The on-speed light comes on
    Explanation
    At 95% RPM during APU starting, the on-speed light comes on. This indicates that the APU has reached its optimal speed for operation.

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  • 12. 

    How many mechanics are required to operate the APU?

    • A.

      One

    • B.

      Two

    • C.

      Three 

    • D.

      Four

    Correct Answer
    B. Two
    Explanation
    Two mechanics are required to operate the APU. The APU, or Auxiliary Power Unit, is a device that provides power to an aircraft when the main engines are not running. It is responsible for starting the main engines, providing electrical power, and operating various systems on the aircraft. Due to the complexity of these tasks, it requires two mechanics to ensure proper operation and maintenance of the APU.

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  • 13. 

    The area around the APU inlet door should be inspected for?

    • A.

      Ice

    • B.

      General APU condition

    • C.

      Foreign Objects

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The area around the APU inlet door should be inspected for ice, general APU condition, and foreign objects. Ice can pose a risk to the APU's performance and should be removed. Inspecting the general APU condition ensures that it is functioning properly and any issues can be addressed. Foreign objects, such as debris or loose parts, can also affect the APU's operation and should be removed to prevent damage. Therefore, all of the above options should be considered during the inspection of the APU inlet door area.

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  • 14. 

    The purpose of the APU is to provide _______.

    • A.

      Hydraulic pressure for ground operation

    • B.

      Electrical power for starting engines

    • C.

      Electrical and hydraulic power to various sections of the aircraft

    • D.

      Bleed air for engine starting and ground operations

    Correct Answer
    D. Bleed air for engine starting and ground operations
    Explanation
    The APU (Auxiliary Power Unit) is responsible for providing bleed air for engine starting and ground operations. Bleed air is used to start the aircraft's engines and also for various ground operations. It is not used for providing hydraulic pressure or electrical power, as stated in the other options.

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  • 15. 

    Do not hold the AGENT DISCHARGE switch for more than ____ seconds or you may cause the fire extinguisher circuit breaker to trip.

    • A.

      One

    • B.

      Two

    • C.

      Three 

    • D.

      Four

    Correct Answer
    B. Two
    Explanation
    Holding the AGENT DISCHARGE switch for more than two seconds may cause the fire extinguisher circuit breaker to trip. This implies that there is a safety mechanism in place to prevent the circuit from being overloaded or damaged if the switch is held for too long. It is important to release the switch within the specified time limit to avoid any potential issues.

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  • 16. 

    What must be done before pressurizing the bleed air manifold?

    • A.

      Clear the propeller area

    • B.

      Check the ramp area

    • C.

      Close the #2 fuel cross-feed

    • D.

      Call for clearance from the control tower

    Correct Answer
    A. Clear the propeller area
    Explanation
    Before pressurizing the bleed air manifold, it is important to clear the propeller area. This is necessary to ensure the safety of personnel and prevent any potential damage to the aircraft or surrounding objects. By clearing the propeller area, any objects or individuals that may be in the way of the propeller's rotation are removed, reducing the risk of accidents or damage.

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  • 17. 

    What is the purpose of draining the fuel strainer sump prior to the first start of the day?

    • A.

      To check the fuel for contamination and water

    • B.

      To ensure the APU has proper fuel flow

    • C.

      To ensure the APU fuel shut-off valve is in the open position

    • D.

      To ensure the APU fuel shut-off valve is in the closed position

    Correct Answer
    D. To ensure the APU fuel shut-off valve is in the closed position
    Explanation
    Draining the fuel strainer sump prior to the first start of the day helps to ensure that the APU fuel shut-off valve is in the closed position. This is important because if the fuel shut-off valve is left open, it can lead to fuel leakage and potential hazards. By draining the fuel strainer sump, any remaining fuel in the system is removed, indicating that the shut-off valve is closed and preventing any fuel from flowing into the APU during start-up.

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  • 18. 

    If while testing the bleed air pressure ducts, on aircraft prior to AF83-0486 except planes modified by TO 1C-130-1653, the time of the pressure drop is 8.5 seconds or greater, you should _____________

    • A.

      Try to isolate the problem to aid in troubleshooting

    • B.

      Not operate the bleed air

    • C.

      Shut down the APU

    • D.

      Do nothing, it is within limits

    Correct Answer
    D. Do nothing, it is within limits
    Explanation
    If the time of the pressure drop in the bleed air pressure ducts is 8.5 seconds or greater, it is considered normal and within limits. Therefore, there is no need to take any action or make any changes as it is not indicative of a problem or malfunction.

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  • 19. 

    Where is the bleed air manifold pressure gauge located?

    • A.

      On the overhead electrical panel

    • B.

      Near the Navigator's control station

    • C.

      On the pilot's main instrument panel

    • D.

      Aft of the left troop door

    Correct Answer
    B. Near the Navigator's control station
    Explanation
    The bleed air manifold pressure gauge is located near the Navigator's control station.

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  • 20. 

    Normally which radio is used for emergency communications?

    • A.

      ADF

    • B.

      HF

    • C.

      SCNS

    • D.

      UHF

    Correct Answer
    D. UHF
    Explanation
    UHF (Ultra High Frequency) radio is typically used for emergency communications. UHF radios have a shorter wavelength and higher frequency, allowing for better signal propagation in urban areas and indoors. They are commonly used by emergency services such as police, fire departments, and medical services to communicate during emergencies. UHF radios also offer better range and clearer audio quality, making them suitable for reliable and effective communication in emergency situations.

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  • 21. 

    What is the quantity of the APU oil system and tank?

    • A.

      3 US Quarts

    • B.

      4 US Quarts

    • C.

      5 US Quarts

    • D.

      6 US Quarts

    Correct Answer
    D. 6 US Quarts
    Explanation
    The quantity of the APU oil system and tank is 6 US Quarts.

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  • 22. 

    The start light should go out within _____ minutes

    • A.

      One

    • B.

      Two

    • C.

      Three

    • D.

      Four

    Correct Answer
    A. One
    Explanation
    The start light should go out within one minute.

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  • 23. 

    If the start light doesn't go out within its specified time, the APU will be shut down and allowed to cool for _____ minute(s)

    • A.

      One

    • B.

      Two

    • C.

      Three

    • D.

      Four

    Correct Answer
    D. Four
    Explanation
    If the start light doesn't go out within its specified time, the APU will be shut down and allowed to cool for four minutes.

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  • 24. 

    Exceeding what percent RPM will cause the APU to shutdown and possibly re-light with a loud bang?

    • A.

      35% speed switch

    • B.

      95% speed switch

    • C.

      105% speed switch

    • D.

      110% speed switch

    Correct Answer
    D. 110% speed switch
    Explanation
    The APU (Auxiliary Power Unit) is a device in an aircraft that provides power for various functions when the main engines are not running. If the RPM (Revolutions Per Minute) of the APU exceeds 110%, it will trigger the shutdown mechanism, and there is a possibility of it re-lighting with a loud bang. This indicates that exceeding 110% RPM is the threshold at which the APU may experience a dangerous situation, leading to its shutdown and potential damage.

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  • 25. 

    If the APU fire warning system is not operating properly ________.

    • A.

      Do not operate the APU

    • B.

      Have ground man monitor APU and proceed

    • C.

      Have an extra person visually monitor the APU

    • D.

      Document aircraft forms and proceed with caution

    Correct Answer
    A. Do not operate the APU
    Explanation
    If the APU fire warning system is not operating properly, it is not safe to operate the APU. The fire warning system is designed to detect any potential fire hazards in the APU, and if it is not functioning correctly, there is a risk of fire that may go undetected. Therefore, it is important to not operate the APU until the fire warning system is repaired or replaced to ensure the safety of the aircraft and its occupants.

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  • 26. 

    When operating the APU from battery power only, turn on the APU generator as soon as practical to avoid ________.

    • A.

      Overheating the APU

    • B.

      Overloading the main DC Bus

    • C.

      Depleting the aircraft battery

    • D.

      Over-pressurizing the bleed air manifold

    Correct Answer
    C. Depleting the aircraft battery
    Explanation
    When operating the APU from battery power only, it is essential to turn on the APU generator as soon as possible to avoid depleting the aircraft battery. The APU generator will provide electrical power to the aircraft systems, reducing the reliance on the battery and preventing it from draining completely. This is important to maintain the battery's charge and ensure that it is available for other critical functions or emergencies.

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  • 27. 

    Hearing protection is required for who when the APU is operating?

    • A.

      The ground man

    • B.

      The APU operator

    • C.

      For all personnel in the vicinity of the airplane when APU is operating

    • D.

      Ground man and APU operator

    Correct Answer
    C. For all personnel in the vicinity of the airplane when APU is operating
    Explanation
    When the APU (Auxiliary Power Unit) is operating, hearing protection is required for all personnel in the vicinity of the airplane. This is because the APU generates a significant amount of noise which can be harmful to hearing. Therefore, to ensure the safety and well-being of everyone near the airplane, it is necessary for all personnel to wear hearing protection in such situations.

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  • 28. 

    The operator must be familiar with the emergency shutdown procedures and be prepared to shut down the APU if ________.

    • A.

      An overheat is detected in the APU

    • B.

      A fire is detected in the engine turbine

    • C.

      An overheat warning light is detected

    • D.

      A fire warning light comes on or a situation is observed which requires immediate shutdown

    Correct Answer
    D. A fire warning light comes on or a situation is observed which requires immediate shutdown
    Explanation
    The operator must be familiar with the emergency shutdown procedures and be prepared to shut down the APU if a fire warning light comes on or a situation is observed which requires immediate shutdown. This is because a fire in the APU or any other situation that requires immediate shutdown can be potentially dangerous and can lead to more serious consequences if not addressed promptly. Therefore, the operator must be prepared to take immediate action to prevent further damage or harm.

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  • 29. 

    Ensure that the propeller area is clear for all four engines before pressurizing the bleed air manifold because _______.

    • A.

      The may be AGE equipment in the plain of rotation

    • B.

      There may be personnel in the prop arcs

    • C.

      The propellers may rotate if an engine start valve has failed in the open posistion 

    • D.

      An open bleed air duct may cause a fire or overheat condition

    Correct Answer
    C. The propellers may rotate if an engine start valve has failed in the open posistion 
    Explanation
    The correct answer is that the propellers may rotate if an engine start valve has failed in the open position. This is because when the engine start valve is open, it allows air to flow into the engine and start the combustion process. If this valve fails to close properly, it can result in the continuous flow of air, causing the propellers to rotate even when the engines are not intended to be running. This can be dangerous if there are personnel or equipment in the propeller area, as it can lead to accidents or damage.

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  • 30. 

    Place the engine fire test switch to test and verify

    • A.

      The FIRE warning light comes on

    • B.

      The warning light in the APU fire control handle comes on

    • C.

      The FIRE warning light and the warning light in the APU fire control handle comes on 

    • D.

      The anti-ice overheat circuit test light comes on

    Correct Answer
    C. The FIRE warning light and the warning light in the APU fire control handle comes on 
    Explanation
    When the engine fire test switch is placed to test and verify, the correct answer states that the FIRE warning light and the warning light in the APU fire control handle come on. This indicates that the fire warning system is functioning properly and is able to detect and indicate a fire in the engine or APU. The activation of both warning lights provides a clear visual indication to the pilot that there is a potential fire hazard and appropriate actions need to be taken to address the situation.

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  • 31. 

    What should you do if the isolated DC power is interrupted while the APU is operating?

    • A.

      Continue the run using battery power

    • B.

      Place the APU control switch to stop

    • C.

      Pull the fire control handle for the APU

    • D.

      Check the frequency and voltage of the battery

    Correct Answer
    B. Place the APU control switch to stop
    Explanation
    If the isolated DC power is interrupted while the APU is operating, the correct action to take is to place the APU control switch to stop. This is the appropriate response to ensure the safety and proper functioning of the APU.

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  • 32. 

    When performing bleed air pressure check, start timing when pressure drops to ________.

    • A.

      15 PSI

    • B.

      20 PSI

    • C.

      30 PSI

    • D.

      40PSI

    Correct Answer
    C. 30 PSI
    Explanation
    When performing a bleed air pressure check, it is important to start timing when the pressure drops to 30 PSI. This is because 30 PSI is a significant drop in pressure and indicates that there may be an issue with the system. Starting the timing at this point allows for accurate monitoring and troubleshooting of the bleed air system.

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  • 33. 

    When performing bleed air pressure check, end timing when pressure drops to  _____.

    • A.

      15 PSI

    • B.

      20 PSI

    • C.

      30 PSI

    • D.

      40 PSI

    Correct Answer
    A. 15 PSI
    Explanation
    During the bleed air pressure check, the end timing should be marked when the pressure drops to 15 PSI. This indicates that the system has been properly pressurized and can maintain the required pressure. A drop in pressure below this level may indicate a leak or malfunction in the system, requiring further inspection and maintenance.

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  • 34. 

    The APU system includes the APU, APU door, APU control, APU indicating and __________.

    • A.

      Oil supply subsystems, exhaust, and ATM

    • B.

      ATM, ATM air, and oil supply subsystems

    • C.

      Starting, exhaust, oil supply subsystem

    • D.

      Bleed air, ATM, APU fuel supply and oil supply subsystems

    Correct Answer
    C. Starting, exhaust, oil supply subsystem
    Explanation
    The APU system includes various components such as the APU, APU door, APU control, APU indicating, starting system, exhaust system, and oil supply subsystems. These components work together to provide the necessary power and functions of the APU. The starting system allows the APU to be started, the exhaust system helps in expelling the waste gases produced by the APU, and the oil supply subsystem ensures that the APU is properly lubricated for smooth operation.

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  • 35. 

    When do you start timing the warm up during APU operation?

    • A.

      35 Seconds after you let the start switch come on

    • B.

      After you place the start switch to start 

    • C.

      After start light goes out

    • D.

      After the on-speed light comes on

    Correct Answer
    D. After the on-speed light comes on
    Explanation
    The correct answer is "After the on-speed light comes on." The on-speed light indicates that the APU has reached its operating speed, which is necessary for it to provide sufficient power. Therefore, it is important to start timing the warm-up period after the on-speed light comes on to ensure that the APU is fully operational before proceeding with other tasks.

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  • 36. 

    Where are the normal controls for the APU?

    • A.

      On the Navigator's station

    • B.

      On the overhead control panel in the flight station

    • C.

      On the co-pilots kick panel

    • D.

      On the pilot's kick panel

    Correct Answer
    B. On the overhead control panel in the flight station
    Explanation
    The normal controls for the APU are located on the overhead control panel in the flight station. This is where the pilot and co-pilot have access to various controls and switches for the aircraft systems, including the APU. The overhead control panel is easily accessible and allows for convenient operation of the APU during flight.

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  • 37. 

    The start light and on speed light are located on the APU control panel

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The explanation for the given correct answer is that the start light and on speed light are indeed located on the APU control panel. This suggests that when the APU (Auxiliary Power Unit) is being started, the start light will indicate the process, and the on speed light will indicate when the APU has reached the required speed for operation. Therefore, the statement "The start light and on speed light are located on the APU control panel" is true.

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  • 38. 

    What must be read and understood before operating the APU?

    • A.

      1C-130E-49JG-00-1-1

    • B.

      Emergency shutdown procedures

    • C.

      1C-130H-2-05JG-00-1

    • D.

      1C-130H-2-12JG-10-2

    Correct Answer
    B. Emergency shutdown procedures
    Explanation
    Before operating the APU, it is important to read and understand the emergency shutdown procedures. These procedures provide critical instructions on how to safely shut down the APU in case of an emergency or malfunction. By familiarizing oneself with these procedures, operators can ensure that they are prepared to handle any potential issues that may arise during APU operation, thereby ensuring the safety of the aircraft and its occupants.

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  • 39. 

    Frost is acceptable on the inlet screen while operating APU

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Frost is acceptable on the inlet screen while operating the APU because it indicates that the APU is functioning properly and is drawing in the necessary air for combustion. The frost forms due to the cold temperature of the air being drawn into the APU, and it does not pose any risk or hinder the operation of the APU. Therefore, it is considered acceptable and normal for frost to be present on the inlet screen while the APU is running.

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  • 40. 

    What must be done prior to operating the APU with a failed door actuator?

    • A.

      Tap on the door actuator to try and open it

    • B.

      Disconnect the actuator wires

    • C.

      Place the external DC power switch to off

    • D.

      Open the door warning circuit breaker

    Correct Answer
    C. Place the external DC power switch to off
    Explanation
    Prior to operating the APU with a failed door actuator, the external DC power switch must be placed in the off position. This is necessary to ensure that power is not being supplied to the actuator, which could potentially cause further damage or malfunction. By turning off the external DC power switch, the actuator will be safely disconnected from any power source, allowing for the APU to be operated without the risk of exacerbating the issue with the failed door actuator.

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  • 41. 

    Failure to let the APU wind down for 4 minutes between starts could cause what?

    • A.

      Starter Damage

    • B.

      APU compressor damage

    • C.

      APU turbine damage

    • D.

      Internal damage to the oil pump from hot oil

    Correct Answer
    A. Starter Damage
    Explanation
    Failure to let the APU wind down for 4 minutes between starts could cause starter damage. This is because the starter is responsible for initiating the APU's startup process by rotating the turbine. If the APU is not allowed to wind down completely before starting it again, the starter may be subjected to excessive heat and stress, leading to potential damage.

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  • 42. 

    Prior to pressurizing the bleed air manifold you must ________.

    • A.

      Place the anti-icing wing switch to ON

    • B.

      Place the nacelle preheat switches to on

    • C.

      Place the underfloor heating switch to on

    • D.

      Place the air conditioning master switch to off

    Correct Answer
    D. Place the air conditioning master switch to off
    Explanation
    Before pressurizing the bleed air manifold, it is necessary to turn off the air conditioning master switch. This is because the air conditioning system uses bleed air from the manifold, and pressurizing the manifold while the switch is on could cause damage to the system. Therefore, turning off the air conditioning master switch ensures that the system is not affected during the pressurization process.

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  • 43. 

    While placing the APU bleed air valve switch to open, you notice a propeller rotating you should ________

    • A.

      Pull the applicable propeller circuit breaker

    • B.

      Close the applicable engine bleed air valve

    • C.

      Place the APU bleed air valve switch to closed/off

    • D.

      Shut down the APU to stop bleed air

    Correct Answer
    C. Place the APU bleed air valve switch to closed/off
  • 44. 

    After you place the APU control switch to start you should watch for the start light to be on before releasing the switch to run.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    When starting the APU, it is important to ensure that the start light is on before releasing the switch to run. This indicates that the APU has successfully started and is running properly. Releasing the switch too early could result in an incomplete start or failure to start the APU. Therefore, it is crucial to wait for the start light to be on before moving on to the next step.

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  • 45. 

    All engine levers must be placed to ground stop prior to starting the APU

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The correct answer is true because before starting the APU (Auxiliary Power Unit), it is necessary to place all engine levers to ground stop. This is done to ensure that the engines are completely shut down and will not inadvertently start while the APU is being started. Placing the engine levers to ground stop is a safety measure to prevent any potential accidents or damages during the APU start-up process.

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  • 46. 

    While using the APU to provide bleed air pressure you must monitor ________

    • A.

      Cargo compartment temperature indicator

    • B.

      Flight deck temperature indicator

    • C.

      Leading edge temperature indicator

    • D.

      APU turbine inlet temperature

    Correct Answer
    C. Leading edge temperature indicator
    Explanation
    When using the APU to provide bleed air pressure, it is important to monitor the leading edge temperature indicator. This is because the leading edge of the aircraft's wings is susceptible to ice formation, which can affect the aircraft's performance and safety. By monitoring the leading edge temperature, pilots can ensure that it remains within a safe range and take appropriate measures to prevent ice formation, such as activating wing anti-ice systems if necessary.

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  • 47. 

    During start the start light comes on then goes off when the control switch is released to run

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    During start, the start light typically comes on to indicate that the machine is being powered on. However, the light should not go off when the control switch is released to run. In a normal functioning system, the start light should remain off during operation and only come back on when the machine is being powered off or restarted. Therefore, the correct answer is False.

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  • 48. 

    Prior to starting the APU you have to check the setting of the aircraft cargo door and ramp controls

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Before starting the APU (Auxiliary Power Unit), it is necessary to check the setting of the aircraft cargo door and ramp controls. This is important to ensure the safety and proper functioning of the aircraft. By checking these controls, the pilot or ground crew can ensure that the cargo door is securely closed and the ramp is in the correct position. Failure to do so could result in damage to the aircraft or potential hazards during the APU start-up process. Therefore, the statement "Prior to starting the APU you have to check the setting of the aircraft cargo door and ramp controls" is true.

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  • 49. 

    All five fire handles must be pushed in to run the APU.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    To run the APU, all five fire handles must be pushed in. This means that each of the fire handles must be activated or engaged in order for the APU to start functioning. This is likely a safety measure to ensure that all potential fire hazards are properly addressed before starting the APU.

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  • 50. 

    You are required to perform a radio check when operating APU.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    When operating an APU (Auxiliary Power Unit), it is necessary to perform a radio check. This check is done to ensure that the radio communication system is functioning properly and can be used for communication purposes. By performing a radio check, the operator can verify that the APU's radio is transmitting and receiving signals effectively, allowing for clear and reliable communication with other parties.

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