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Airframe Oral > Hydraulic And Pneumatic > Flashcards

Hydraulic And Pneumatic Flashcards

1
Q

What colors denote mineral based and phosphate-ester base hydraulic fluids

A

Mineral base is red and phosphate-ester base is light purple

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2
Q

What are the results of exposing lacquers, oil-based paint, plastic resins, and vinyl compounds to phosphate-ester bases hydraulic fluid

A

Materials will be damaged and softened, or the paint will peel

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3
Q

Name several sources used to develop hydraulic pressure

A

Hand , engine driven , and electrically driven pumps

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4
Q

What would cause the bypass valve in a hydraulic filter to open and allow unfiltered fluid to circulate in the system

A

A clogged filter element

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5
Q

Describe several methods of pressurizing a hydraulic reservoir

A

Engine bleed air, system pressure acting on a small piston in the reservoir, and variable displacement hydraulic pumps

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6
Q

What feature prevents engine damage if an engine driven hydraulic pump seizes or is overloaded

A

A shear section in the pump driveshaft will break, disconnecting the pump from the engine

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7
Q

Describe the purpose of a pressure relief valve

A

Limits the amount of pressure in the system

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8
Q

Engine driven pumps deliver the output fluid flow in what two forms

A

constant volume or variable volume

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9
Q

What’s the difference between pneumatic systems and hydraulic

A

Pneumatic system is compressible and has no return system

Hydraulic system is incompressible

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10
Q

Describe the purpose of a pressure regulator

A

manages the output of the pump to maintain system pressure.

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11
Q

What is the device that is used in some systems to supplement the pump output during periods of high demand

A

An accumulator

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12
Q

What are the three different types of accumulators

A

Piston, diaphragm, and bladder

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13
Q

What safety precautions must be taken prior to disassembling an accumulator

A

Release all of the air or preload

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14
Q

What materials form the bases of the three types of hydraulic fluids

A

Vegetable, mineral, and phosphate-esters

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15
Q

When a hydraulic unit is replaced or disconnected what precautions should be taken to avoid contamination of the system

A

capped or plugged immediately after they are disconnected

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16
Q

What types of components or system are pneumatically operated in some aircraft

A

Landing gear, breaks, flaps, and other mechanical actuators

17
Q

Name several sources of pneumatic power

A

Storage bottles, engine bleed air, engine driven compressor or vane type pumps

18
Q

What happens to excess pressure in a pneumatic system

A

A relief valve vents it overboard

19
Q

What is the function of a restrictor in a pneumatic system

A

controls the rate of flow

20
Q

What are the reasons for periodically purging a pneumatic system

A

To remove moisture and contaminants

21
Q

How do you determine which type of hydraulic fluid to use in a particular aircraft or system

A

Aircraft maintenance manual, place card attached to the reservoir

22
Q

What will happen to the seals in a vegetable base hydraulic system of it is serviced with mineral base or phosphate ester base fluids

A

Swell, brake down, and block the system

23
Q

What is the purpose of a unloading valve on a closed hydraulic system

A

Provides a low pressure path for fluid to flow from the pump back to the reservoir, also acts as a pressure regulator

24
Q

What is the function of a wing overload valve

A

Prevents possible structural damage to the flaps or flap system

25
Q

What happens to the air after a pneumatic system is operated

A

Is dumped overboard

26
Q

What’s the purpose of a accumulator

A

Prevent hydraulic system shock when under high load demand conditions

27
Q

What is an example of a phosphate ester base fluid

A

Skydrol

28
Q

How can you be sure that a replacement seal in a hydraulic component is compatible with the fluid being used

A

Use only seals identified by the part number that is specified in the components maintenance Manuel

29
Q

Whet type of system is used in a low- pressure pneumatic system

A

Vane type pump

30
Q

What two filters are used in a pneumatic system

A

Micronic ( paper) and screen

Airframe Oral (17 decks)

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