Hydraulic Systems Quiz
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Questions and Answers

Where is the circuit breaker for the hydraulic system located?

  • Battery bus circuit breaker panel (correct)
  • Power pack slide assembly
  • Front cockpit
  • Rear cockpit

    • What happens when the circuit breaker placarded HYD SYS is open?

  • Pressure indication and EHYD PX LO sensor are available
  • Pressure indication and HYD FL LO sensor are not available (correct)
  • Pressure indication and HYD FL LO sensor are available
  • Pressure indication and EHYD PX LO sensor are not available

    • What activates the emergency hydraulic system?

  • Pulling the emergency gear extension handle (correct)
  • Pressurizing the emergency accumulator
  • Opening the circuit breaker placarded HYD SYS
  • Releasing the emergency accumulator pressure

    • What does the amber EHYD PX LO caution on the EICAS indicate?

    <p>Emergency accumulator pressure is below 2400 ±150 psi</p> Signup and view all the answers

    What prevents the emergency system from bleeding back into the main system?

    <p>Check valve</p> Signup and view all the answers

    What is the maximum fluid loss allowed in the event of an emergency hydraulic system leak?

    <p>20-30 cubic inches (0.5 quart)</p> Signup and view all the answers

    What happens if the leak rate is below 0.25 GPM?

    <p>Main reservoir depletes until HYD FL LO caution illuminates</p> Signup and view all the answers

    When does the EHYD PX LO caution extinguish?

    <p>When the system pressurizes</p> Signup and view all the answers

    What is the fluid flow rate to the emergency accumulator restricted to?

    <p>Below 0.25 GPM</p> Signup and view all the answers

    What is the only indication of the emergency accumulator's status?

    <p>Amber EHYD PX LO caution on the EICAS</p> Signup and view all the answers

    Which component prevents damage from high system pressure in the hydraulic system?

    <p>Pressure relief valve</p> Signup and view all the answers

    Where is the hydraulic system service bay located?

    <p>In the lower aft fuselage behind the right wing trailing edge</p> Signup and view all the answers

    What does the fluid quantity indicator in the hydraulic system service bay show?

    <p>Level of hydraulic fluid</p> Signup and view all the answers

    At what pressure does the hydraulic pump pressurize the normal system and emergency accumulator?

    <p>3000±120 psi.</p> Signup and view all the answers

    What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?

    <p>Landing gear, main gear doors, flaps, speed brake, and nose wheel steering</p> Signup and view all the answers

    What color does the hydraulic pressure display change to when the pressure drops below 1800 psi?

    <p>Amber</p> Signup and view all the answers

    What does the amber HYD FL LO caution on the EICAS display indicate?

    <p>Low hydraulic fluid level</p> Signup and view all the answers

    How is the hydraulic fluid level checked in the hydraulic system service bay?

    <p>By comparing the position of the green indicating rod to marked indicator windows</p> Signup and view all the answers

    What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?

    <p>Depressurize the emergency accumulator by pulling the manual pressure release handle</p> Signup and view all the answers

    When should the hydraulic system be serviced?

    <p>When the accumulator is fully discharged and the fluid level indicates FULL AD</p> Signup and view all the answers

    Where is the pressure relief valve located in the hydraulic system?

    <p>In the main and emergency systems</p> Signup and view all the answers

    What is the capacity of the engine driven pump in the hydraulic system?

    <p>Approximately 5 quarts</p> Signup and view all the answers

    What does the amber HYD FL LO caution on the EICAS display indicate?

    <p>The reservoir level has dropped below approximately 1 quart</p> Signup and view all the answers

    What is the purpose of the manual pressure release handle in the hydraulic system service bay?

    <p>To release the pressurized fluid from the emergency accumulator back to the reservoir</p> Signup and view all the answers

    What happens when the hydraulic pressure indicator drops below 1800 psi?

    <p>The hydraulic pressure display changes from white to amber</p> Signup and view all the answers

    What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?

    <p>Landing gear, main gear doors, flaps, speed brake, and nose wheel steering</p> Signup and view all the answers

    What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?

    <p>Depressurize the emergency accumulator by pulling the manual pressure release handle</p> Signup and view all the answers

    Where is the hydraulic system service bay located?

    <p>In the lower aft fuselage behind the right wing trailing edge</p> Signup and view all the answers

    What is the purpose of the ground hydraulic power, sampling, and servicing connection in the hydraulic system service bay?

    <p>To provide power, sampling, and servicing for the hydraulic system</p> Signup and view all the answers

    What does the fluid quantity indicator in the hydraulic system service bay show?

    <p>The level of hydraulic fluid in the power package reservoir</p> Signup and view all the answers

    Which system is activated by pulling the emergency gear extension handle in the front cockpit?

    <p>Emergency hydraulic system</p> Signup and view all the answers

    Which caution on the EICAS indicates that the emergency accumulator pressure has dropped below a certain level?

    <p>Amber EHYD PX LO caution</p> Signup and view all the answers

    What is the purpose of the hydraulic fuse in the emergency system?

    <p>To limit fluid loss in the event of an emergency hydraulic system leak</p> Signup and view all the answers

    What happens if the leak rate in the emergency system exceeds 0.25 GPM?

    <p>The system depletes the main reservoir until the HYD FL LO caution illuminates</p> Signup and view all the answers

    What is the only indication of the emergency accumulator's status?

    <p>Amber EHYD PX LO caution on the EICAS</p> Signup and view all the answers

    What is the maximum volume of fluid loss allowed in the event of an emergency hydraulic system leak?

    <p>20-30 cubic inches (0.5 quart)</p> Signup and view all the answers

    What is the rate at which the fluid flow to the emergency accumulator is restricted?

    <p>Below 0.25 GPM</p> Signup and view all the answers

    What happens when the circuit breaker placarded HYD SYS is open?

    <p>The pressure indication and HYD FL LO sensor is not available</p> Signup and view all the answers

    What does the amber HYD FL LO caution on the EICAS indicate?

    <p>Insufficient fluid in the main reservoir</p> Signup and view all the answers

    When should the light indicating the discharge of the emergency accumulator extinguish?

    <p>Before flight</p> Signup and view all the answers

    Which circuit breaker provides power for the hydraulic system?

    <p>HYD SYS</p> Signup and view all the answers

    What is the indication of the emergency accumulator's status?

    <p>EHYD PX LO caution</p> Signup and view all the answers

    What happens when the emergency accumulator pressure drops below 2400 ±150 psi?

    <p>Amber EHYD PX LO caution illuminates</p> Signup and view all the answers

    What prevents the emergency system from bleeding back into the main system?

    <p>Check valve</p> Signup and view all the answers

    What is the maximum volume of fluid loss allowed in the event of an emergency hydraulic system leak?

    <p>20-30 cubic inches (0.5 quart)</p> Signup and view all the answers

    What is the rate at which the fluid flow to the emergency accumulator is restricted?

    <p>Below 0.25 GPM</p> Signup and view all the answers

    What is the color of the caution displayed on the EICAS when the emergency accumulator pressure drops below 2400 ±150 psi?

    <p>Amber</p> Signup and view all the answers

    What should be done if the emergency accumulator is discharged?

    <p>Ensure light has extinguished prior to flight</p> Signup and view all the answers

    What is the purpose of the hydraulic fuse in the emergency system?

    <p>To prevent a leak in the emergency system from depleting the main hydraulic system</p> Signup and view all the answers

    When is the hydraulic system considered to have sufficient fluid to lower the landing gear and flaps using the main system?

    <p>When the HYD FL LO caution illuminates</p> Signup and view all the answers

    Where is the hydraulic system service bay located?

    <p>In the lower aft fuselage</p> Signup and view all the answers

    What is the capacity of the engine driven pump in the hydraulic system?

    <p>Approximately 5 quarts</p> Signup and view all the answers

    What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?

    <p>Landing gear, main gear doors, flaps, speed brake, and nose wheel steering</p> Signup and view all the answers

    What happens when the circuit breaker placarded HYD SYS is open?

    <p>The hydraulic system loses all power</p> Signup and view all the answers

    What does the amber HYD FL LO caution on the EICAS display indicate?

    <p>The hydraulic fluid level is low</p> Signup and view all the answers

    What is the only indication of the emergency accumulator's status?

    <p>The green indicating rod</p> Signup and view all the answers

    What does the amber EHYD PX LO caution on the EICAS indicate?

    <p>The emergency hydraulic system is malfunctioning</p> Signup and view all the answers

    What happens if the leak rate is below 0.25 GPM?

    <p>The hydraulic system continues to operate normally</p> Signup and view all the answers

    What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?

    <p>Depressurize the emergency accumulator</p> Signup and view all the answers

    What is the purpose of the manual pressure release handle in the hydraulic system service bay?

    <p>To release the pressurized fluid from the emergency accumulator back to the reservoir</p> Signup and view all the answers

    Study Notes

    Hydraulic System

    • The circuit breaker for the hydraulic system is placarded HYD SYS.
    • When the HYD SYS circuit breaker is open, the system is shut down.
    • The emergency hydraulic system is activated by pulling the emergency gear extension handle.

    Emergency Hydraulic System

    • The emergency hydraulic system is protected from bleeding back into the main system by a check valve.
    • The system allows a maximum fluid loss of 0.25 GPM in the event of a leak.
    • If the leak rate is below 0.25 GPM, the system will continue to operate.
    • The amber EHYD PX LO caution on the EICAS indicates a low pressure in the emergency accumulator.

    Hydraulic Pressure

    • The hydraulic pump pressurizes the normal system and emergency accumulator to 3000 psi.
    • When the pressure exceeds 1800 psi, the system can power flight controls, landing gear, and brakes.
    • If the pressure drops below 1800 psi, the display changes to amber.
    • The amber HYD FL LO caution on the EICAS indicates a low fluid level.

    Hydraulic System Service Bay

    • The hydraulic system service bay is located on the aircraft.
    • The fluid quantity indicator shows the fluid level, which should be checked regularly.
    • If the fluid level is not FULL AC or FULL AD, the level should be topped up.
    • The service bay is also used for ground hydraulic power, sampling, and servicing connection.

    Emergency Accumulator

    • The emergency accumulator's status is indicated by the EHYD PX LO caution on the EICAS.
    • If the pressure drops below 2400 ±150 psi, the caution will illuminate.
    • The hydraulic fuse prevents damage from high system pressure.
    • If the emergency accumulator is discharged, it should be serviced.

    System Operation

    • The hydraulic system is considered to have sufficient fluid to lower the landing gear and flaps using the main system when the level is FULL AC or FULL AD.
    • The engine-driven pump has a capacity of 7.5 GPM.
    • The system can be powered by the hydraulic system when the pressure exceeds 1800 psi.

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    Description

    Test your knowledge of hydraulic systems and their components with this quiz. Learn about the engine-driven pump, pressure relief valve, and other important features.

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