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Virtually all modern airplanes use a simple hydraulic system to operate the _____
A hydaulic system must contain 4 basic types of units.
- Fluid supply
- Selector valve
A single unit containing an electrically driven hydraulic pump, reservoir, control valve and many of the auxiliary valves is known as a hydraulic _______ system.
The two types of hydraulic reservoirs are:
- Integral (in another component, like a transmission)
- In-line (inside its own housing , connected by hoses)
Aircraft that operate in the lower altitudes normally use _______ reservoirs
3 ways to pressurize hydraulic reservoirs:
- aspirator (by jet action draws more air into reservoir)
- bleed air
- hydraulic piston
One micron is equal to ___ inch.
.000039 inch or 1 millionth of a meter
Pleated paper micronic filters are usually installed in the hydraulic system pressure or return line?
Cuno filters can or cannot be used on the pressure side of the system?
Used on pressure side
Hand pumps are usually single or double acting?
piston rod displacement double acting
Which type of pump moves a specific volume of fluid each time its shaft turns
What type of valve is needed when a constant displacement pump is used?
regulator or relief valve
A gear type hydraulic pump is a ________ pump.
A hydraulic system using a variable displacement pump does or does not require an unloading valve.
A selector valve is one of the most common type of ____ (flow or pressure) control valve.
The (open or closed) center valve directs fluid through the center of the valve back to the reservoir when a unit is not being actuated.
A valve that allows fliud to flow in one direction but no flow in the opposite direction is called ?
AA valve that allows fliud to flow in one direction but a restricted flow in the other direction is called ?
Orifice check valve
A valve that required one component to fully actuate before another can actuate is called ?
Sequence valves are opened mechanically or hydraulically?
Priority valves are opened mechanically or hydraulicly?
Similar to a sequence valve but opened by hydraulic pressure instead of mechanical contact?
What can be installed to block a line in case of a serious leak?
Two principles upon which a hydraulic fuse operates?
- Pressure drop
- Volume limiting
The simplest type of pressure control valve is ?
What may be installed when it is necessary to operate some portion of a hydraulic system at a pressure lower that normal system pressure?
What device is used to store hydraulic pressure?
One compartment of an accumulator is connected to the hydraulic system while the other side is filled with?
Nitrogen or Dry air
What are the 3 types of accumulators?
AN812 valve cores are identified by what letter embossed on their stem?
Which air valve has these features?
- Metal to metal seal
-Swivel nut to open and close , same size as valve body
AN812, AN6287-1, or MS28889-1
How many different types of air valves are used in aircraft?
Which air valve has these features?
-"H" stamped on stem
-Similar to automotive
-Core is used to seal
AN812, AN6287-1, or MS 28889-1
What air valves have these features?
-Metal to metal seal
-opened and closed by swivel nut smaller than body of valve
-Has a core
Hydraulic actuators which produce a straight line movement are known as?
If a continuous rotational force is needed , a hydraulic ____ is used.
A chevron seal is a one or two way seal?
An o-ring is a one or two way seal?
An o-ring should have a width approx. 10% ____ than the width of its groove.
What is used with an o-ring when the operating pressure exceeds 1500 psi?
O-ring back-up rings are made of?
Leather or Teflon
The ______ date is the date of O-ring manufacture.
An o-ring marked with a blue dot is compatible with?
Air or 5606
When installing or removing o-rings , extreme care must be taken to prevent rings from being _____ by sharp edges.
nick or cut
O rings with red dots are used for?
O-rings with a green dot are used with?
O-rings with yellow dots are used with?
synthetic engine oil
O-rings with a white dot are used with?
petroleum engine oil
Name 4 one way seals.
What is used to prevent loss of fluid when hydraulic units are replaced?
Quick disconnect valves
What is an example of a variable displacement pump?
What are 2 types of check valves?
What are the 4 types of linear actuators
- Single acting
- double acting balanced
- double acting unbalanced
What is meant by a tandem actuator.
2 actuators built into one unit
Actuators that contain a control valve are generally called.
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