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AIRCRAFT HYDRAULIC SYSTEMS

LEARNING    OBJECTIVE

Identify    the components of aircraft hydraulic systems and recognize their functions. The aircraft hydraulic systems found on most navalaircraft     perform     many     functions.    

 Some     systems operated by hydraulics are flight controls, landing gear, speed    brakes,    fixed-wing    and  rotary-wing    folding mechanisms,auxiliary systems, and wheel brakes. Hydraulics has many advantages as a power source for operating these units on aircraft. !    

Hydraulics    combine    the    advantages    of lightweight, easeof installation, simplification of
 inspection,    and    minimum    maintenance requirements. Hydraulics   operation   is   almost   100-percent efficient,  with  only  a  negligible  loss  due  tofluid friction.

However, there  are  some  disadvantages  to  using hydraulics.
• The  possibility  of  leakage,  both  internal  and external,  may  cause  the  complete  system  to becomeinoperative.     
• Contamination by foreign matter in the system can cause malfunction of any unit. Cleanliness in hydraulics cannot be overemphasized.

COMPONENTS OF A BASIC SYSTEM

Basically,   any    hydraulic    system    contains    the following units:
• A reservoir to hold a supply of hydraulic fluid
• A pump to provide a flow of fluid
• Tubing to transmit the fluid    
• A selector valve to direct the flow of fluid     
• An actuating unit to convert the fluid pressure into useful work .

FIGURE 4-21

A   simple   system  using   these   essential   units  is shown the figure. You can trace the flow of fluid from the reservoir through the pump to the selector valve. In figure 4-21, the flow of fluid created by the pump flowsthrough the valve  to  the  right  end  of  the  actuating  cylinder.  Fluid pressure forces the piston to the left. At the same time, the fluid that is on the left of the piston is forced out....
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