ATA 29 - HYDRAULIC

What is the normal source of pressure for the green hydraulic system?. a. Engine Driven Pump (EDP). b. Power Transfer Unit (PTU). c. Electrical pump (E-Pump). d. Ram Air Turbine (RAT).

Which hydraulic system can the blue electric pump be used as an auxiliary power source for on the ground?. a. Green. b. Blue. c. Yellow. d. None.

What is the purpose of the Power Transfer Unit (PTU)?. a. It transfers fluid between the green and yellow hydraulic systems. b. It provides auxiliary pressure supply to the blue system. c. It is used for cargo door operation on the yellow system. d. It is auxiliary pressure supply for either the green or yellow systems.

How is the RAT deployed for auxiliary pressure supply?. a. Automatically. b. Manually. c. Both automatically and manually. d. It is always extended.

What prevents the RAT from stowing when extended?. a. Interlock mechanism. b. Hydraulic pressure. c. Spring force. d. Solenoid operation.

Which system uses the Constant Speed Motor/Generator (CSM/G) to provide emergency electrical power?. a. Green. b. Yellow. c. Blue. d. All systems.

What is the role of priority valves in the hydraulic system?. a. They cut off hydraulic power to essential systems. b. They transfer fluid between hydraulic systems. c. They cut off hydraulic power to heavy load users. d. 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. a. 100psi. b. 250psi. c. 500psi. d. 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. a. automatically. b. manually. c. both automatically and manually. d. 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. a. 10 degrees. b. 45 degrees. c. 90 degrees. d. 5 degrees.

In the event of low hydraulic pressure, the priority valves maintain the operation of essential systems by cutting off hydraulic power to __________. a. heavy load users. b. all systems. c. the PTU. d. the RAT.

What is the auxiliary source of pressure for the blue hydraulic system?. a. EDP. b. PTU. c. E-Pump. d. RAT.

Where are hydraulic pipes located within the aircraft?. a. Passenger cabin and flight compartment. b. Only in the flight compartment. c. Only in the passenger cabin. d. In the aircraft except in Passenger cabin and flight compartment.

What is the nitrogen pressure set to during the pressurization of the reservoir?. a. 30 PSI. b. 40 PSI. c. 50 PSI. d. 60 PSI.

Before starting the filling procedure, what must be the position of the flight control surfaces and cargo doors?. a. Neutral retracted position. b. Fully extended position. c. Open position. d. Any position.

What should the triple indicator show when the yellow electric pump is selected to OFF?. a. Hydraulic system pressure. b. Brake accumulator pressure. c. Nitrogen pressure. d. Green hydraulic pressure.

Why should a warning notice be placed before operating the hydraulic system?. a. To indicate the system is depressurized. b. To prevent others from operating the system. c. To remind the operator to wear gloves. d. To indicate the cargo doors are closed.

What is done with the hand pump lever from the yellow panel during the filling operation?. a. It is removed and assembled for use on the green panel. b. It is left in place. c. It is disconnected and stored in a toolbox. d. It is used to depressurize the system.

What precautions should be taken before removing the flexible hose from its housing?. a. Wear proper protection gloves and goggles. b. Disconnect the hydraulic system. c. Depressurize the nitrogen pressure. d. Ensure the cargo doors are open.

How is the selection of the hydraulic system to be filled confirmed?. a. A colored LED on the indication panel. b. A sound alert. c. A pressure gauge reading. d. An audible beep.

Where should the system reservoir be filled to during the filling operation?. a. To the end of the scale. b. To the last white line in the related colored band. c. To the top of the reservoir. d. To the halfway mark.

The triple indicator should show the brake accumulator as being fully pressurized to 5000 PSI when the electric pump is turned OFF. False. True.

Warning notices are placed to remind the operator to wear gloves and goggles during the hydraulic filling operation. False. True.

The hand pump lever is disconnected and stored in a toolbox during the filling operation. False. True.

The flexible hose is inserted into a new canister of hydraulic fluid after connecting it to the hand pump. True. False.

The filling operation is initiated by selecting the hydraulic system that needs to be filled. True. False.

The system reservoir should be filled to the end of the scale during the filling operation. False. True.