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4 Advantages of hydraulics systems?
- Lighter weight
- Ease of installation
- Simplification of inspection
- Minimum maintenance requirements
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Hydraulic systems are almost _____% efficient.
100%
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Hydraulic fluid is considered to be compressible or incompressible.
incompressible
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The pressure exerted by a column of liquid is determined by height of the column or the volume of the container?
height of the column
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Pascal's law states that the pressure in a closed system is transmitted ____and ____ to _____parts of the system.
equally and undiminished to all parts of the system
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Force per unit area is a measure of?
Pressure, measured in PSI or Kilos per square cm
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The relationship between Force, area, and pressure may be expressed using the formula?
F=AxP
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In a hydraulic system the relationship between the area of the piston, distance it moves , and the volume of displaced fluid may be expressed by the formula______.
Volume = Area x Distance
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What are 2 major advantage to hydraulic systems over mechanical systems?
- 1 Large gain in mechanical advantage by using different sized pistons.
- 2 Ease that force can be transmitted over large distances
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A good hydraulic fluid must possess 4 propeties.
- Proper viscosity
- Chemical stability
- High flashpoint
- High firepoint
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What is the proper viscosity for hydraulic fluid?
Thick enough to seal and lubricate but not too thick as to offer excessive friction
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_______ is the internal resistance to fluid flow of a liquid.
Viscosity
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The temperature that a fluid gives off vapor in sufficient quantity to ignite momentarily is called?
Flash point
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3 types of hydraulic fluid currently being used in civilian aircraft are:
- Vegetable based (Mil-H-7644)
- Mineral based (Mil-H-5606)
- Synthetic (Skydrol)
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Is it permissible to mix different types of hydraulic fluid?
No
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What is an example of a phosphate ester based fluid?
Skydrol
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Vegetable base hydraulic fluid is essentially ______ oil and ______.
Castor oil and alcohol
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Vegetable based hydraulic fluid is dyed _____.
Blue
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What hydraulic fluid is dyed red ?
Mil-H-5606
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The most widely used hydraulic fluid in use today?
Skydrol
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Skydrol is colored ?
light purple
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Synthetic hydraulic fluid was designed to provide a _____ resistant hydraulic fluid
Fire resistant
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If skydrol is spilled , it should be cleaned immediately with ______ and _______.
Soap and water
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What fluid can be used to flush the hydraulic system of these fluids
1 vegetable
2 mineral
3 synthetic
- 1 Alcohol
- 2 Naptha , varsol or stoddart solvents
- 3 trichlorethylene
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What seal materials are used with the following hydraulic fluids:
1 Vegetable
2 Mineral
3 Synthetic
- 1 Natural rubber
- 2 Neoprene
- 3 Butyl rubber or ethylene-propylene elastomers
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The additives in 5606 help reduce____.
Foaming
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