# Understanding the Principle and Operation of an Airplane's Hydraulic System!

Jun 02, 2021
hello this is ten today we will be talking about

s in an

## airplane

first lets see what is a

this is a

## system

that uses pressurized hydraulic fluid for the movement of different components of an

## airplane

these components could include flight controls landing its extension and retraction and the brakes now let's see the

#### principle

of the hydraulic system the

### operation

of this system is based on Pascal's law to understand this law let's consider a closed container that is filled with hydraulic fluid according to Pascal's law if a pressure is acting on this fluid it will be transmitted equally in all directions and will act perpendicular to the surface of the container now let's look at the application of Pascal's law first we consider a force acting on the fluid in this section let this force be one thousand pounds the area of cross section at this section is one square inch, pressure is defined as force times area, so so we get the pressure in this section as thousands of pounds per square inch or thousand psi now let's consider another section here that has the same cross sectional area of ​​one square inch the pressure would be the same thousand psi therefore the force we get in this section it would be a thousand pounds now lets increase the area in this section to two square inches the pressure is again a thousand psi but if we calculate the force we get two thousand pounds so for the same pressure just increasing the area we can increase the force in this part of the container.
This is called as the stress end where the pressure has to be created is called the load end which can be connected to different components that need to move by changing the area at the load end the force is changed as per the requirement with this

#### principle

now let's look at the aircraft hydraulic system reviewing the components that make up the system each hydraulic system must have a reservoir holstee hydraulic fluid reservoir that we only needed for the em system this is the supply line that supplies the required fluid this is the return line in the fluid returns to the reservoir the reservoir can be pressurized so that a positive flow is maintained in the supply line pressurization can be done by taking leaded air from the engine or APU the next component we will look at is the pumps the pumps are used to pressurize the hydraulic fluid, the pump could be motor driven or it could be an electrically operated pump.