AIRCRAFT HYDRAULIC SYSTEMS
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 .
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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