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40 Cards in this Set

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  • Back
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
What is the advantage of the open-center hydraulic system over the closed-center hydraulic system?
Continuous pressurization of the system is eliminated
The hydraulic control valves and actuators that operate the primary flight controls are of what type construction?
tandem construction
There are a total of how many classes of hydraulic reservoirs?
two
The fluid quantity of a nonpressurized reservoir is indicated by a float and arm liquidometer. The liquidometer is operated by what means?
mechanically operated
In an air-pressurized reservoir, the fluid quantity is indicated by what means?
the distance the piston rod protrudes from the reservoir end cap
Hydraulic systems that require the use of hand pumps are classified as what type of system?
emergency systems
What type of hydraulic pump does not require the use of external pressure regulators or unloading valves?
variable displacement pumps
What type of hydraulic pump is usually driven by a dc wound electric motor?
gear-type pump
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?
13 gallons of fluid per minute at 3,800 rpm
Why are relief valves installed in aircraft hydraulic systems?
to relieve excessive pressurized fluid caused from thermal expansion, pressure surges, and the failure of a hydraulic pump's compensator or other regulating devices.
To increase the opening pressure of a thermal relief valve, what action must you take?
turn the adjusting screw clockwise
In a hydraulic system, what is the purpose of the motor-operated shutoff valve?
to shut off the flow of hydraulic fluid to the engine in case of an engine fire
What is the maximum allowable temperature for any type of military aircraft hydraulic system?
400 degrees F
A radiator-type hydraulic fluid cooler uses what medium for cooling?
engine fuel
What component is used to conserve space and provide a means where common fluid lines may come together?
a manifold
What are the three basic units of a hydraulic filter assembly?
head assembly, a bowl, and a filter element
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
What is the advantage of the open-center hydraulic system over the closed-center hydraulic system?
Continuous pressurization of the system is eliminated
The hydraulic control valves and actuators that operate the primary flight controls are of what type construction?
tandem construction
There are a total of how many classes of hydraulic reservoirs?
two
The fluid quantity of a nonpressurized reservoir is indicated by a float and arm liquidometer. The liquidometer is operated by what means?
mechanically operated
In an air-pressurized reservoir, the fluid quantity is indicated by what means?
the distance the piston rod protrudes from the reservoir end cap
Hydraulic systems that require the use of hand pumps are classified as what type of system?
emergency systems
What type of noncleanable filter element is used on most naval aircraft?
5 micron absolute
The differential pressure indicator on a filter assembly is reset by what means once the button is extended?
manually
To prevent fluid loss when the bowl has been removed, most filter assemblies incorporated what item in the head?
an automatic shutoff valve
How many general types of accumulators are used on naval aircraft?
two
What is the correct method to preload an accumulator?
pressurize the fluid chamber with compressed air to a predetermined charge.
To indicate the amount of pressure in a hydraulic system, naval aircraft use what two types of pressure gauges?
Direct reading and synchro (electric) type.
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?
a gauge and pressure transmitter snubber or snubbers
What are the three methods currently used for driving emergency system pumps on naval aircraft?
electric-motor driven, ram-air turbine driven, or hand-operated
What component initiates extension of the ram-air turbine assembly?
a spring-loaded turbine actuator
A chemical air dryer cartridge is NOT contaminated when it is what color?
blue