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37 Cards in this Set
- Front
- Back
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What unit transforms hydraulic fluid pressure into mechanical force, which performs work by moving some mechanism?
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An actuating unit.
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Aircraft actuating cylinders are used when which of the following mechanism movements are required?
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Linear or reciprocating motion.
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If hydraulic pressure is used to move a single-acting actuating cylinder in only one direction, what force is used to move it in the opposite direction?
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Spring tension.
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Most piston-type actuating cylinders are of what type?
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Double-acting type.
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The operation of a single-acting, spring-loaded, piston-type actuating cylinder is normally controlled by what component?
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A directional control valve.
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An unbalanced, double-acting, piston-type actuating cylinder uses a directional control valve capable of directing fluid in what total number of ways?
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Four.
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When the cylinder is in the down and locked position, the locking ball bearings are held in the locking position by what means?
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A ball-lock plunger.
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To equalize the displacement of fluid on either side of the piston, a double-action, finger-lock actuator incorporates what component?
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An inner cylinder.
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During normal extension of a landing gear finger-lock actuator, what forces move the piston over the fingers?
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Hydraulic pressure and spring tension.
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In a power-operated flight control system, all the force necessary for deflecting the control surface is supplied by what type of pressure?
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Hydraulic pressure.
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A tandem-type, control surface, actuating cylinder uses a synchronizing rod for what purpose?
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To equalize the flow of fluid into the actuator piston chambers.
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In the maintenance of actuating cylinders, what is the most common trouble encountered?
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External leakage.
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What type of motor converts hydraulic pressure into rotary mechanical motion?
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A hydraulic motor.
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Hydraulic motors are commonly used to operate what aircraft equipment?
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Radar and wing flaps.
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To relieve pressure created by thermal expansion of the fluid, a system that has a balanced poppet-type selector valve must also incorporate what other type of valve?
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A thermal relief valve.
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The poppets of a poppet-type selector valve are actuated by what means?
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The cams on the camshaft.
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When all four of the poppets of a poppet-type selector valve are held firmly seated by the springs and there is no fluid flow, the valve is in what position?
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The neutral position.
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External leakage from a poppet-type selector valve could be caused by what condition?
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A damaged gasket under the sealing plug.
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Currently, what type of selector valve is the most durable and trouble-free?
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The slide-type.
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The slide-type selector valve has raised, machined portions that are known by what term?
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Lands.
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A slide-type selector valve has three grooves at the end next to the eye. The grooves are known by what term?
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Detents.
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A slide-type selector valve should have a light film of hydraulic fluid applied to the exposed areas of the slide primarily for what purpose?
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To prevent corrosion.
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A solenoid-operated selector valve is controlled by what means?
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Electrically.
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A solenoid-operated selector valve directs the flow of fluid to and from the actuator by the use of what component?
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The selector slide.
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For the proper cleaning, inspection, repair, and testing of selector valves, you should use what series of NAVAIR manuals as a guide?
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03 series.
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When testing a solenoid selector valve, you must bleed all air from the valve before applying pressure for what reason?
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To prevent a leak from going undetected.
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What is the purpose of a check valve?
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To allow fluid to flow in one direction only.
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A bypass check valve differs from an automatic check valve in what way?
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It can be manually opened to allow fluid to flow in both directions.
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In what two ways are sequence valves operated?
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Mechanically operated or pressure-operated.
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What are the two types of mechanically operated sequence valves?
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Balanced and unbalanced.
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Trouble associated with a mechanically operated sequence valve is most commonly a result of what problem?
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Improper adjustment.
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Isolation of the normal system from the emergency hydraulic system is the main function of what valve?
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The shuttle valve.
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Excessive heating of a shuttle valve is a good indication of what type of problem?
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Internal leakage.
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An actuating units speed of operation is controlled by what component?
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A restrictor.
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To retard the action of a hydraulic cylinder by limiting the flow of fluid in both directions, you should use what device?
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A two-way restrictor.
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What is the primary purpose of a hydraulic fuse?
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It is a safety device.
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Hydraulic fluid entering a hydraulic fuse is divided into two flow paths by what means?
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The control head.
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