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30 Cards in this Set

  • Front
  • Back
A system that combines the use of hydraulics and pneumatics is known by what term
Hydraulic flight control system design specifications require what total number of separate systems for operation of the primary flight controls
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 betweeen 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
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 indicate 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), makel 65WB06006, rated at 3000 psi is capable of delivering how many gallon of fluid per minute
13 gallons of fluid per minute at 3800 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 navy 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
a head assembly, a bowl, and a filter element
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
to prevent fluid loss when the bowl has been removed, most filter assemblies incorporate what item in the head
an automatic shutoff valve
how many general types of accumulators are used on naval aircraft
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 us what two types of pressure gauges
direct reading and synchro type
what component is used to damper out system pressure 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
electic 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 in NOT contaminated when it is what color