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Questions and Answers
Which type of system is commonly used in large aircraft?
Which type of system is commonly used in large aircraft?
- Pneumatic
- Cable and pushrod
- Hydraulic
- Both hydraulic and pneumatic (correct)
What is the purpose of using hydraulic pressure in aircraft brakes?
What is the purpose of using hydraulic pressure in aircraft brakes?
- To increase braking force (correct)
- To operate remotely
- To solve routing problems
- To use compressible fluid
What is the relationship between pressure, force, and area in a hydraulic system?
What is the relationship between pressure, force, and area in a hydraulic system?
- F = P - A
- F = P x A (correct)
- F = P + A
- F = P / A
What happens when air cannot be evacuated from hydraulic lines?
What happens when air cannot be evacuated from hydraulic lines?
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According to Pascal's Law, what happens to the pressure exerted on a fluid in an enclosed container?
According to Pascal's Law, what happens to the pressure exerted on a fluid in an enclosed container?
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Study Notes
Aircraft Hydraulic Systems
- Hydraulic systems are commonly used in large aircraft.
- Hydraulic pressure is used in aircraft brakes to produce the force necessary to stop the aircraft.
- Pascal's Law states that pressure applied to an enclosed fluid is transmitted undiminished to all points within the fluid and to the walls of the container.
- Pressure, force, and area are related by the formula: Pressure = Force / Area
- This means that a small force applied to a small area can create a large force on a larger area.
- Air trapped in hydraulic lines can create air pockets, which can reduce the effectiveness of the hydraulic system and cause problems, such as:
- Reduced brake effectiveness
- Erratic actuation of other hydraulically operated components
- System damage
- Air must be completely evacuated from hydraulic lines for the system to function properly.
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