ATA 29 - HYDRAULIC

What is the normal source of pressure for the green hydraulic system?

• Engine Driven Pump (EDP)

• Power Transfer Unit (PTU)

• Electrical pump (E-Pump)

• Ram Air Turbine (RAT)

Which hydraulic system can the blue electric pump be used as an auxiliary power source for on the ground?

• Green

• Blue

• Yellow

• None

What is the purpose of the Power Transfer Unit (PTU)?

• It transfers fluid between the green and yellow hydraulic systems.

• It provides auxiliary pressure supply to the blue system.

• It is used for cargo door operation on the yellow system.

• It is auxiliary pressure supply for either the green or yellow systems

How is the RAT deployed for auxiliary pressure supply?

• Automatically

• Manually

• Both automatically and manually

• It is always extended

What prevents the RAT from stowing when extended?

• Interlock mechanism

• Hydraulic pressure

• Spring force

• Solenoid operation

Which system uses the Constant Speed Motor/Generator (CSM/G) to provide emergency electrical power?

• Green

• Yellow

• Blue

• All systems

What is the role of priority valves in the hydraulic system?

• They cut off hydraulic power to essential systems.

• They transfer fluid between hydraulic systems.

• They maintain hydraulic pressure in the passenger cabin.

• They supply hydraulic power to heavy load users.

The PTU is an auxiliary pressure supply for either the green or yellow systems without the transfer of fluid between the two systems. It operates automatically if there is a delta pressure of __________ between the green/yellow or yellow/green hydraulic systems.

• 100psi

• 250psi

• 500psi

• 750psi

The RAT is an auxiliary pressure supply for the blue system and for the emergency electrical power Constant Speed Motor/Generator (CSM / G). It can be deployed __________ or manually depending on the failure conditions.

• automatically

• manually

• both automatically and manually

• neither automatically nor manually

The interlock mechanism on the RAT will only permit RAT stowage if the blades are properly aligned. It also prevents rotation when stowed. The interlock will release at approximately __________ degrees from the full extension position.

• 10 degrees

• 45 degrees

• 90 degrees

• 5 degrees