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40 Cards in this Set
- Front
- Back
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A system that combines the use of hydraulics and pneumatics is known by what term?
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Hydropneumatics
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Hydraulic flight control system design specifications require what total number of separate systems for operation of the primary flight controls?
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two
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What type of hydraulic system has fluid flow but no pressure in the system when the actuating mechanisms are idle?
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An open-center system
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What is the major difference between an open-center hydraulic system and a closed-center hydraulic system?
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the closed-center hydraulic systems selector or directional control valves are arranged in parallel and not in series
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What is the advantage of the open-center hydraulic system over the closed-center hydraulic system?
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Continuous pressurization of the system is eliminated
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The hydraulic control valves and actuators that operate the primary flight controls are of what type construction?
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tandem construction
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There are a total of how many classes of hydraulic reservoirs?
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two
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The fluid quantity of a nonpressurized reservoir is indicated by a float and arm liquidometer. The liquidometer is operated by what means?
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mechanically operated
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In an air-pressurized reservoir, the fluid quantity is indicated by what means?
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the distance the piston rod protrudes from the reservoir end cap
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Hydraulic systems that require the use of hand pumps are classified as what type of system?
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emergency systems
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What type of hydraulic pump does not require the use of external pressure regulators or unloading valves?
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variable displacement pumps
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What type of hydraulic pump is usually driven by a dc wound electric motor?
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gear-type pump
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The piston-type pump (Stratopower variable displacement), Model 65WB06006, rated at 3,000 psi is capable of delivering how many gallons of fluid per minute?
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13 gallons of fluid per minute at 3,800 rpm
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Why are relief valves installed in aircraft hydraulic systems?
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to relieve excessive pressurized fluid caused from thermal expansion, pressure surges, and the failure of a hydraulic pump's compensator or other regulating devices.
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To increase the opening pressure of a thermal relief valve, what action must you take?
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turn the adjusting screw clockwise
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In a hydraulic system, what is the purpose of the motor-operated shutoff valve?
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to shut off the flow of hydraulic fluid to the engine in case of an engine fire
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What is the maximum allowable temperature for any type of military aircraft hydraulic system?
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400 degrees F
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A radiator-type hydraulic fluid cooler uses what medium for cooling?
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engine fuel
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What component is used to conserve space and provide a means where common fluid lines may come together?
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a manifold
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What are the three basic units of a hydraulic filter assembly?
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head assembly, a bowl, and a filter element
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A system that combines the use of hydraulics and pneumatics is known by what term?
|
Hydropneumatics
|
|
|
Hydraulic flight control system design specifications require what total number of separate systems for operation of the primary flight controls?
|
two
|
|
|
What type of hydraulic system has fluid flow but no pressure in the system when the actuating mechanisms are idle?
|
An open-center system
|
|
|
What is the major difference between an open-center hydraulic system and a closed-center hydraulic system?
|
the closed-center hydraulic systems selector or directional control valves are arranged in parallel and not in series
|
|
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What is the advantage of the open-center hydraulic system over the closed-center hydraulic system?
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Continuous pressurization of the system is eliminated
|
|
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The hydraulic control valves and actuators that operate the primary flight controls are of what type construction?
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tandem construction
|
|
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There are a total of how many classes of hydraulic reservoirs?
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two
|
|
|
The fluid quantity of a nonpressurized reservoir is indicated by a float and arm liquidometer. The liquidometer is operated by what means?
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mechanically operated
|
|
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In an air-pressurized reservoir, the fluid quantity is indicated by what means?
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the distance the piston rod protrudes from the reservoir end cap
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Hydraulic systems that require the use of hand pumps are classified as what type of system?
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emergency systems
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What type of noncleanable filter element is used on most naval aircraft?
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5 micron absolute
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The differential pressure indicator on a filter assembly is reset by what means once the button is extended?
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manually
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To prevent fluid loss when the bowl has been removed, most filter assemblies incorporated what item in the head?
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an automatic shutoff valve
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How many general types of accumulators are used on naval aircraft?
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two
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What is the correct method to preload an accumulator?
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pressurize the fluid chamber with compressed air to a predetermined charge.
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To indicate the amount of pressure in a hydraulic system, naval aircraft use what two types of pressure gauges?
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Direct reading and synchro (electric) type.
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What component is used to damper out system presure surges that could cause possible damage to gauges and pressure transmitters and prevent cockpit hydraulic indicators from oscillating and fluctuating?
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a gauge and pressure transmitter snubber or snubbers
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What are the three methods currently used for driving emergency system pumps on naval aircraft?
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electric-motor driven, ram-air turbine driven, or hand-operated
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What component initiates extension of the ram-air turbine assembly?
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a spring-loaded turbine actuator
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A chemical air dryer cartridge is NOT contaminated when it is what color?
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blue
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