Hydraulic system of aircraft

The hydraulically operated system are  comparatively ____________in weight from other system used  in aircraft.

• heavy

• complex

• large

• light

What are hydraulic system used for on aircraft?

• to operate flight controls, landing  gears, braking system

• to run engines

• to check failures

• to operate only elevator and rudder

Hydraulic system is the system where (a)   under pressure is used to transmit  the energy to various applications.

What are the types of hydraulic fluids?

• semi-synthetic, low viscosity fluid

• vegetable based, mineral, synthetic

• Ideal fluid,

  real fluid

• incompressible, compressible fluid

Hydraulic fluid:

1. Must flow with a minimum of opposition

2. Must be incompressible

3. Must have good lubricating properties

4. Inhibit corrosion and not attack seals

5. Must not foam in operation

6. Must be chemically stable

• True

• False

Components of hydraulic system:

• tank, wing, landing gear

• center tank, wheel, flight controls

• reservoirs, pumps, selector valves, check valves, accumulators

• reservoirs, pumps, center tank

Pascal's Law:

• Pressure exerted on a fluid in an enclosed container is transmitted  equally and undiminished to all parts of the container and acts as  right angles to the enclosing walls.

• A body continues in its state of rest, or in uniform motion in a straight line, unless acted upon by a force.

• A body acted upon by a force moves in such a manner that the time rate of change of momentum equals the force.

• If two bodies exert forces on each other, these forces are equal in magnitude and opposite in direction.

What are the functions of reservoir?

• to change mechanical  horsepower to hydraulic horsepower

• check valve allows the fluid in one direction only

• relives pressure on  system for a safety

• to store the liquid, provide free space for expantion of the fluid, provide a place to remove air or foam from the liquid

What's the main function of pump?

• relives pressure on  system for a safety

• to change mechanical  horsepower to hydraulic horsepower

What are the names of hydraulic system valves?

• pump, actuator, selector

• filter, accumulator, reservoir

• actuator, relief, reservoir

• selector, relief, check