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Questions and Answers
Where is the circuit breaker for the hydraulic system located?
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?
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?
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?
What does the amber EHYD PX LO caution on the EICAS indicate?
What prevents the emergency system from bleeding back into the main system?
What prevents the emergency system from bleeding back into the main system?
What is the maximum fluid loss allowed in the event of an emergency hydraulic system leak?
What is the maximum fluid loss allowed in the event of an emergency hydraulic system leak?
What happens if the leak rate is below 0.25 GPM?
What happens if the leak rate is below 0.25 GPM?
When does the EHYD PX LO caution extinguish?
When does the EHYD PX LO caution extinguish?
What is the fluid flow rate to the emergency accumulator restricted to?
What is the fluid flow rate to the emergency accumulator restricted to?
What is the only indication of the emergency accumulator's status?
What is the only indication of the emergency accumulator's status?
Which component prevents damage from high system pressure in the hydraulic system?
Which component prevents damage from high system pressure in the hydraulic system?
Where is the hydraulic system service bay located?
Where is the hydraulic system service bay located?
What does the fluid quantity indicator in the hydraulic system service bay show?
What does the fluid quantity indicator in the hydraulic system service bay show?
At what pressure does the hydraulic pump pressurize the normal system and emergency accumulator?
At what pressure does the hydraulic pump pressurize the normal system and emergency accumulator?
What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?
What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?
What color does the hydraulic pressure display change to when the pressure drops below 1800 psi?
What color does the hydraulic pressure display change to when the pressure drops below 1800 psi?
What does the amber HYD FL LO caution on the EICAS display indicate?
What does the amber HYD FL LO caution on the EICAS display indicate?
How is the hydraulic fluid level checked in the hydraulic system service bay?
How is the hydraulic fluid level checked in the hydraulic system service bay?
What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?
What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?
When should the hydraulic system be serviced?
When should the hydraulic system be serviced?
Where is the pressure relief valve located in the hydraulic system?
Where is the pressure relief valve located in the hydraulic system?
What is the capacity of the engine driven pump in the hydraulic system?
What is the capacity of the engine driven pump in the hydraulic system?
What does the amber HYD FL LO caution on the EICAS display indicate?
What does the amber HYD FL LO caution on the EICAS display indicate?
What is the purpose of the manual pressure release handle in the hydraulic system service bay?
What is the purpose of the manual pressure release handle in the hydraulic system service bay?
What happens when the hydraulic pressure indicator drops below 1800 psi?
What happens when the hydraulic pressure indicator drops below 1800 psi?
What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?
What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?
What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?
What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?
Where is the hydraulic system service bay located?
Where is the hydraulic system service bay located?
What is the purpose of the ground hydraulic power, sampling, and servicing connection in the hydraulic system service bay?
What is the purpose of the ground hydraulic power, sampling, and servicing connection in the hydraulic system service bay?
What does the fluid quantity indicator in the hydraulic system service bay show?
What does the fluid quantity indicator in the hydraulic system service bay show?
Which system is activated by pulling the emergency gear extension handle in the front cockpit?
Which system is activated by pulling the emergency gear extension handle in the front cockpit?
Which caution on the EICAS indicates that the emergency accumulator pressure has dropped below a certain level?
Which caution on the EICAS indicates that the emergency accumulator pressure has dropped below a certain level?
What is the purpose of the hydraulic fuse in the emergency system?
What is the purpose of the hydraulic fuse in the emergency system?
What happens if the leak rate in the emergency system exceeds 0.25 GPM?
What happens if the leak rate in the emergency system exceeds 0.25 GPM?
What is the only indication of the emergency accumulator's status?
What is the only indication of the emergency accumulator's status?
What is the maximum volume of fluid loss allowed in the event of an emergency hydraulic system leak?
What is the maximum volume of fluid loss allowed in the event of an emergency hydraulic system leak?
What is the rate at which the fluid flow to the emergency accumulator is restricted?
What is the rate at which the fluid flow to the emergency accumulator is restricted?
What happens when the circuit breaker placarded HYD SYS is open?
What happens when the circuit breaker placarded HYD SYS is open?
What does the amber HYD FL LO caution on the EICAS indicate?
What does the amber HYD FL LO caution on the EICAS indicate?
When should the light indicating the discharge of the emergency accumulator extinguish?
When should the light indicating the discharge of the emergency accumulator extinguish?
Which circuit breaker provides power for the hydraulic system?
Which circuit breaker provides power for the hydraulic system?
What is the indication of the emergency accumulator's status?
What is the indication of the emergency accumulator's status?
What happens when the emergency accumulator pressure drops below 2400 ±150 psi?
What happens when the emergency accumulator pressure drops below 2400 ±150 psi?
What prevents the emergency system from bleeding back into the main system?
What prevents the emergency system from bleeding back into the main system?
What is the maximum volume of fluid loss allowed in the event of an emergency hydraulic system leak?
What is the maximum volume of fluid loss allowed in the event of an emergency hydraulic system leak?
What is the rate at which the fluid flow to the emergency accumulator is restricted?
What is the rate at which the fluid flow to the emergency accumulator is restricted?
What is the color of the caution displayed on the EICAS when the emergency accumulator pressure drops below 2400 ±150 psi?
What is the color of the caution displayed on the EICAS when the emergency accumulator pressure drops below 2400 ±150 psi?
What should be done if the emergency accumulator is discharged?
What should be done if the emergency accumulator is discharged?
What is the purpose of the hydraulic fuse in the emergency system?
What is the purpose of the hydraulic fuse in the emergency system?
When is the hydraulic system considered to have sufficient fluid to lower the landing gear and flaps using the main system?
When is the hydraulic system considered to have sufficient fluid to lower the landing gear and flaps using the main system?
Where is the hydraulic system service bay located?
Where is the hydraulic system service bay located?
What is the capacity of the engine driven pump in the hydraulic system?
What is the capacity of the engine driven pump in the hydraulic system?
What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?
What components can be powered by the hydraulic system when the pressure exceeds 1800 psi?
What happens when the circuit breaker placarded HYD SYS is open?
What happens when the circuit breaker placarded HYD SYS is open?
What does the amber HYD FL LO caution on the EICAS display indicate?
What does the amber HYD FL LO caution on the EICAS display indicate?
What is the only indication of the emergency accumulator's status?
What is the only indication of the emergency accumulator's status?
What does the amber EHYD PX LO caution on the EICAS indicate?
What does the amber EHYD PX LO caution on the EICAS indicate?
What happens if the leak rate is below 0.25 GPM?
What happens if the leak rate is below 0.25 GPM?
What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?
What should be done if the fluid level is not FULL AC or FULL AD in the hydraulic system service bay?
What is the purpose of the manual pressure release handle in the hydraulic system service bay?
What is the purpose of the manual pressure release handle in the hydraulic system service bay?
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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.
