Temas

Aircraft Hydraulics System
Aim: To learn about the aircraft hydraulic system.
Origin:
- The word hydraulics is Greek for water.
- Hydraulics is the study of the physical behavior of water at restand
in motion.

Hydraulic Fluids:
- It is used to transmit and distribute forces in order to move certain units.

Pascal's Law:
- Pascal’s law states that pressure applied to any part of aconfined liquid is transmitted equally to every other part.

Viscosity:
- Viscosity is internal resistance to flow.
- Viscosity increases with temperature decreases

Types of hydraulic fluids:- Vegetable Base Hydraulic Fluid
- Mineral Base Hydraulic Fluid
- Phosphate Ester Base Fluids

Vegetable base hydraulic fluid (MIGH-7644)
- Composed of caster oil and alcohol.
- Has a bluecolor and is flammable.
- Used with natural rubber seals

Mineral base hydraulic fluid (MIL-H-5606)
- It is processed from petroleum and comes in red color.
- This fluid is also flammable and usedsynthetic rubber seals.

Phosphate Ester Base Fluids:
- Non-petroleum base hydraulic fluids
- It is fire-resistant and is used in high performance piston engines and turboprop aircraft
- Skydrolwhich comes in clear purple color.

The hydraulic system:
- Reservoir Hand pump
- Power pump Pressure gage
- Filter Relief valve
-Pressure regulator Selector valve
- Accumulator Actuating unit
- Check valves

- Reservoir: a tank in which hydraulic fluid is stored.
- Power pump: a hydraulic pump driven bythe aircraft engine or by an electric motor.
- Filter: a device for straining out unwanted solid particles in a fluid
- Pressure regulator: a device that maintains output pressure form a constantdisplacement pump by bypassing a portion of the fluid back to the inlet side of the pump.
- Accumulator: compressed air in one chamber holds pressure on hydraulic fluid in the other chamber, allowing...