Aircraft Hydraulic Systems

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Questions and Answers

What is the primary function of the Ground Service Panel?

To supply bleed air to the pneumatic system

To regulate hydraulic pressure

To connect a hydraulic ground support cart (correct)

To monitor hydraulic fluid levels

What is the purpose of air pressurization/depressurization of the blue hydraulic system reservoir?

To cool the hydraulic fluid

To drain the hydraulic reservoir

To perform ground handling or maintenance tasks (correct)

To test the hydraulic system

Where is the Ground Service Panel typically located?

In the pneumatic air distribution system

In the hydraulic power subsystem

On the exterior of the aircraft (correct)

In the cockpit

What is the relationship between the bleed air supply and the hydraulic system?

The bleed air supply is used for pressurization/depressurization of the hydraulic reservoir Signup and view all the answers

What component is responsible for regulating hydraulic pressure in the system?

Pressure Regulating Valve Signup and view all the answers

What system is responsible for distributing pressurized air to various components?

Pneumatic Air Distribution System Signup and view all the answers

What is the primary function of the blue system Electrical Motor Pump (EMP)?

To operate the hydraulic system consumers for ground maintenance and operation Signup and view all the answers

Where is the blue system accumulator located?

In the HP manifold Signup and view all the answers

What allows the continuous supply of hydraulic fluid to the blue system consumers?

The check valve Signup and view all the answers

What is the purpose of the extra hydraulic accumulator dedicated to the Blue Braking System?

It will be covered in detail on ATA32 Signup and view all the answers

During ground maintenance, what allows fluid flow from the EMP or ground supply to the blue hydraulic system flight control consumers tests?

The selector valve Signup and view all the answers

What are the hydraulic system consumers that receive power from the blue system?

The flight controls, normal and parking brake, cargo ramp, stabilizer struts, cargo door, air deflector, ramp toes and Hose Drum Unit (HDU) Fuel Pump Signup and view all the answers

What is the primary function of the Reservoir Pressurization Unit?

Not mentioned in the text Signup and view all the answers

What is the relationship between the blue system and the Bleed Air System?

Not mentioned in the text Signup and view all the answers

What is the primary function of the High Pressure Manifold in the A400M Hydraulic Power SubSystem?

To receive high pressure fluid from the Engine Driven Pumps (EDP) and distribute it to the hydraulic system consumers Signup and view all the answers

What type of valve is integrated into the High Pressure Manifold?

Pressure Relief Valve Signup and view all the answers

What component transmits a pressure signal to the Flight Control Computers and to the Control and Display System (CDS)?

System Pressure Transducers Signup and view all the answers

What device sends a signal to the High Lift Control Computers (HLCC) in case of low system pressure?

Pressure Switch Signup and view all the answers

What system does the High Pressure Manifold distribute high pressure fluid to?

Blue/Yellow Hydraulic System Signup and view all the answers

What is the function of the Pressure Relief Valve in the High Pressure Manifold?

To release fluid back to the LP system when the system pressure becomes too high Signup and view all the answers

What is the source of high pressure fluid received by the High Pressure Manifold?

Engine Driven Pumps (EDP) Signup and view all the answers

What is the purpose of the system accumulator in the High Pressure Manifold?

To store hydraulic fluid under pressure Signup and view all the answers

Study Notes

Ground Service Panel (GSP)

Enables connection of hydraulic ground support cart to operate hydraulic system and supply its consumers
Allows air pressurization/depressurization of blue hydraulic system reservoir for ground handling or maintenance tasks when bleed air supply is not available

High Pressure Manifold

Receives high pressure fluid from Engine Driven Pumps (EDP) and distributes it to Blue/Yellow Hydraulic System consumers, LP circuit, and system accumulator
Incorporates:
- Three System Pressure Transducers transmitting pressure signal to Flight Control Computers and Control and Display System (CDS)
- One Pressure Switch sensing low system pressure and sending signal to High Lift Control Computers (HLCC)
- One Pressure Relief Valve integrated in the manifold, releasing fluid back to LP system when system pressure becomes too high

Hydraulic Consumers

Blue System Consumers

Hydraulic blue system supplies power to:
- Flight controls
- Normal and parking brake
- Cargo ramp
- Stabilizer struts
- Cargo door
- Air deflector
- Ramp toes
- Hose Drum Unit (HDU) Fuel Pump
Blue system Electrical Motor Pump (EMP) enables hydraulic system consumers to be operated for ground maintenance and operation
One blue system accumulator, located in HP manifold, supplements flow from system pumps during short-term and high flow consumer demands
Selector valve lets continuous supply via check valve from EDPs when at least one engine is running
During ground maintenance, selector valve can be opened to grant fluid flow from EMP or ground supply to blue hydraulic system flight control consumers tests

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Description

This quiz covers the Ground Service Panel and High Pressure Manifold components in aircraft hydraulic systems, including their functions and connections.