A Flashcards
(207 cards)
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5606 can be Identified by its
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red color
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Definition
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relief valves are used in pneumatic systems as
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damage preventing units
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9
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the pressure switch is a component that will signal the pilot if there is
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too little or too high of pressure in the system
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One of the distinguishing characteristics of an open center selector valve used in hydra…
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Term
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fluid flows through the valve in the off position
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Definition
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a Servo is a component that is used when
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precise control is necessary during movement
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mineral-based oil requires
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Definition
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neoprene rubber packing materials
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a hydraulic component that automatically directs fluid from either the normal Source or...
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shuttle valve
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The air that is expended and no longer needed when an actuating unit is operated in a...
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exhausted or dumped usually overboard
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generally the first step in performing maintenance of a hydraulic system on aircraft is to
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relieve the system pressure
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the purpose of a pressure regulator in a hydraulic system is to
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maintain system operating pressure within a predetermined range and unload the pumps
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The formula for computing force is
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AX P
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the mechanically operated unit which causes one hydraulic operation to follow another...
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sequence valve
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a fully charged hydraulic accumulator provides additional hydraulic power when
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heavy demands are placed on the system
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Definition
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A compensator assembly is a component in a variable delivery pump that allows it to
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only pump what the system demands
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Definition
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a pump Drive Shear section is a safety device that is usually located
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between the driving unit and hydraulic pump drive shaft
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The hydraulic accumulator is charged with an air preload of 1000 PSI and when a hydrau...
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3
000 PSI
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A hydraulic pump is a constant displacement type if
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it delivers a uniform rate of flow
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to check the air in a hydraulic accumulator you should
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reduce all hydraulic pressure then observe the reading on the accumulator gauge
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pneumatic systems utilize
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relief valves
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an orifice check valve is a unit that allows
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free fluid flow in one direction and restricted flow in the other direction
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Delta p is the unit that tells a filter assembly
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if it is bypassing fluid
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name three different types of accumulators
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diaphragm bladder and piston
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Hydraulic operations are roughly how efficient?
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roughly 100% efficient with negligible loss due to fluid friction
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Definition
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Pumps may be classified in one of two categories
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positive or non positive displacement
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Both a high flash point and a high fire point are desired for hydraulic fluids
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true
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there is a 3
000 PSI hydraulic system with a piston area of 0.5
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1500
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Skydrol is a trademarked name for a
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phosphate-ester based hydraulic fluid
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Butyl is a material that would be compatible with
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Skydrol
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viscosity is defined as
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internal resistance to flow
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three ways of pressurizing a reservoir are
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bleed air
an aspirator
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to prevent vortexing and surging of hydraulic fluid
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baffles and fins are installed in the reservoir
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a hydraulic pump
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creates flow
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if a hydraulic filter becomes clogged the system will receive fluid through
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the bypass
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a hydraulic fuse
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blocks the hydraulic line if A major leak occurs
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Definition
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A ruptured diaphragm is what most likely is going to happen if
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you get hydraulic fluid out of the nitrogen fitting on an accumulator
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sequence valves are normally
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mechanically operated
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an actuator is a component in a hydraulic system that
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changes pressure into Force
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a packing is
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a sealing and element that is subject to motion
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The main purpose of a pressurized Reservoir and hydraulic system is to
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prevent hydraulic pump cavitation
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hydraulic system thermal relief valves are set to
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open at a higher pressure than the system relief valve
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Skydrol hydraulic fluid is adversely affected by
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atmospheric humidity and moisture if left unprotected
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hydraulic fluid reservoirs are sometimes designed with a standpipe in one of the outlet...
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the normal system pump.
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the component and hydraulic system that is used to direct the flow of fluid is the
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selector valve
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A dampener
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controls the speed of relative movement between two connected objects
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a heat exchanger or cooling units are required in some aircraft hydraulic systems becau...
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high heat from high rates of fluid flow
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Buena N is the material for seals that are used in
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Mineral based hydraulic fluids
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Extrusion of an O-ring seal is prevented in a high pressure system by
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use of a backup ring on the side of the O-ring away from the pressure
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quick disconnect couplings in a hydraulic system provide means of quickly connecting a....
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the loss of fluid or entrance of contaminants into the system
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accumulators and what they do
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Vegetable based fluid
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MIL-H-7644
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Mineral based fluid
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MIL-H-5606
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Synthetic based fluid (SKYDROL)
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MIL-H-8446
