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Cards In This Set
| Front | Back |
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The term 'jack stalling' means
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Air pressure is preventing full extension of the jack
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Compared to hydraulic actuating systems, pneumatic systems of the same operating pressure
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Exert less force
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In a hydraulic system with an operating pressure of 3000 psi, an actuator measuring 10 inches by 10 inches would exert a force of
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300000
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A restrictor valve is fitted to the landing gear hydraulic system of a large jet aircraft is to
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Prevent hydraulic cavitation during gear extension
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Where in the hydraulic system is the restrictor valve located
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In the return line of the gear extension system
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Restrictor valve
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Limits the speed of operation of the actuator in one direction
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Two types of hydraulic pumps
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Constant displacementconstant pressure (variable displacement)
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Which type of pump requires the use of a pressure regulator
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Only constant displacement pumps as variable displacement pumps are able to vary fluid output
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Operating pressure of hydraulic system in large aircraft
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3000 psi
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When used to operate powered controls, large aircraft hydraulic systems require
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An artificial feel system
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Where is the pressure regulator located in a hydraulic system
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After the pump
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The pressure accumulators purposes are
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To provide emergency pressure in the event of a pump failureto smooth out pressure variations in the linesreduce knocking and hammering
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Shuttle valves
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Allow the alternate system to pressurise the lines and provide system operation
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Priority valves
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Automatically shut off supply to non-essential services in the event of a hydraulic fluid leak
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Two types of hydraulic systems
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Constant delivery typeconstant pressure type
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