Chapter 4 - Hydraulic principles (18-07-18) Flashcards

1
Q

What are some typical uses for hydraulic in large A/C?

A

Gear and wheel brakes

noise wheel steering

Primary flight controls

Spoilers

Flaps

Speed brakes

Engine thrust reversers

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2
Q

In terms of hydraulic response, what does an incompressible fluid allow for?

A

An immediate response to an input.

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3
Q

What can be said about the static pressure at different locations in a fluid when a load is being applied to it?

A

It is the same everywhere in the fluid.

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4
Q

What 2 equations are used to work out the displacement of an output piston from the input piston in a hydraulic system?

A

W = F x d

F = P x A

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5
Q

What is a passive hydraulic system?

A

One that uses human power to raise pressure

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6
Q

What is an active hydraulic system?

A

One that uses one or more pumps

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7
Q

What properties must a hydraulic fluid possess?

A

Low viscosity

resistance to foaming

good lubricator

corrosion resistant

thermal stability

high boiling point & low freezing point

Chemically inert

non flammable with flash point above 100degC

good storage properties

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8
Q

What are the 2 different oil types and when can they be mixed?

A

Synthetic (purple)

Mineral (Red)

THEY MUST NEVER BE MIXED

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9
Q

What should a person do when handling oil for hydraulic systems and why?

A

Wear protective clothing to avoid direct contact due to the corrosive nature of the oil

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10
Q

What are the advantages of a hydraulic system?

A

Excellent for providing large amounts of power

little energy lost in the transmission process

leaks are easy to spot

reduced weight compared to mechanical system

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11
Q

What are the disadvantages of a hydraulic system?

A

The fluid is highly corrosive

forces generated can require strong structures

large systems can be heavy

susceptible to fluid contamination

damage to hydraulic lines

hydraulic fluid is a health risk and environmentally hazardous

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12
Q

What are the basic components of an elementary hydraulic system?

A

Pump

Pipes

Valves

Fluid

resevior

accumulator

actuators

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