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40 Cards in this Set
- Front
- Back
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Why do non pressurized reservoirs have space above the fluid?
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To allow the fluid to purge itself of air bubbles that it picked up from the hydraulic system.
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What prevents foreign material from entering the reservoir during servicing?
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The finger screen or wire screen.
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What are the two main reasons for pressurizing a reservoir?
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One: it stops the fluid from foaming at high altitudes and Two: it ensures a positive supply of fluid to the pumps.
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how is a hydraulic prefers reservoir serviced with the fluid?
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Through the self sealing filler valve.
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What is used to prevent damage to a hydraulic pressurized reservoir during servicing?
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A relief valve.
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What is the first thing you must do in order to service or perform maintenance on an air pressurized reservoir?
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Depressurize the reservoir.
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What component in a pressurized hydraulic reservoir system controls the air pressure within safe limits?
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The air pressure regulator.
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In an air pressurized reservoir, where is the air for reservoir pressurization usually taken from?
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Usually from the aircrafts engine bleed air.
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The hand pump has 3 check valves, what would happen if the hand pump had only TWO check valves and one of them malfunctioned?
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The hand pump will become completely inoperative.
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What is the drawback of a constant volume pump?
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As long as the pump rotates, the fluid flow it produces will eventually build up a high enough pressure in the confined area to burst the lines and container.
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what is the thinned portion on the drive shaft of a gear type pump called?
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The Shear section.
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on a vane type pump what keeps the vanes against the housing wall?
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The springs.
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In the constant volume piston pump, what drives the cylinder block?
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The universal link.
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Why does constant volume piston pump always have a constant intake and output of fluid?
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They're always Pistons somewhere between upper and lower position.
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What happens to the excess case drain pressure in a constant volume piston pump?
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It is routed back to the intake side of the pump.
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Describe the suction boost pumps impeller.
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It is like a paddle wheel on a steamboat that slings the fluid out word from the center, causing the fluid to exit through the outlet port.
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What is the suction boost pump do for the engine driven pumps?
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It ensures the engine pumps getting adequate supply of fluid.
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What regulates pressure in a variable volume pump?
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An integral flow control valve. aka an integral compensator.
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what is the main difference between a Vickers stroke reduction pump and a constant volume pump?
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The angle between the drive shaft in the cylinder block.
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When the system is at 0 psi, the Vickers pumps cylinder block and yoke are in what position to provide full flow?
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The extreme angle position.
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Do the Pistons have a stroke when the Vickers pump Reaches the zero flow point?
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No.
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The Kellogg pump is made up of two major component groups what are they?
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The rotating group in the pressure compensating group.
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What determines the Kellogg pumps length of piston stroke?
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The angle setting of the cam plate.
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What is the purpose of the creep plates in the stratopower Pump?
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Cooler operation and more even wear on the cam plate.
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Describe the Pistons of the stratopower Pump.
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The Pistons have fairly large hollow centers connected with cross drilled holes.
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if the Strato Power Pump senses pressure increase what component is acted on to reduce the pressure?
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The compensator piston.
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On the Strato Power Pump, which way would you turn the adjusting screw screw to increase the pressure?
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Clockwise.
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List the differences between a hydraulic pump and a hydraulic motor.
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Flow is directed into the motor rather than from it and the motor does not have a foot valve.
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What can be used to control the speed of a hydraulic motor?
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The flow control valve.
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Explain the principle of a jackscrew.
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The screw turns and causes the nut to move back and forth along the screw.
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Which chamber of the self displacing accumulator is serviced with fluid when the supply system is serviced with the hand pump?
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The storage chamber.
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What is the purpose of a compensator in a self displacing accumulator system?
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The compensator spring forces the fluid from the compensator into the supply port of the pump.
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In the self displacing accumulator system, where is the relief valve located?
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Between the pressure and return line.
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What are the three basic parts of a filter assembly?
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The head, the element, and the bowl.
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Which part of the filter assembly is normally mounted to the aircraft?
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The head.
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What is meant by micron rating?
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The amount of dirt or contaminants it can filter.
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what are the two ways fluids can usually flow through a filter assembly?
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Normal flow and bypass flow.
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Where are hydraulic Fluid coolers normally located in a hydraulic system?
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In the return lines to cool the fluid as it flows back to the reservoir.
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Why is routing the hot hydraulic fluid lines through the fuel system advantageous?
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The heated fuel is more volatile and will burn more efficiently.
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