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Hydraulics & Pneumatics(Airframes) > Lecture Day 2 > Flashcards

Lecture Day 2 Flashcards

1
Q

Contaminated fluid is one of the most common causes of hydraulic system troubles

A
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2
Q

Removes contaminates before reaching components

A

Line Filters

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3
Q

Pressure or return (common) lines

A

Placement

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4
Q

Construction – Element, bowl, head

A

Filter Bowl – Drain at lowest point

Filter head – Inlet/outlet and BYPASS

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5
Q

Types of Elements

A

Most Common – Micronic Type (Surface filter)

Disposable – treated cellulose with pleated paper.

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6
Q

Cuno Filter (Edge Filter)– Stacked (pressure side)

A
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7
Q

Differential Pressure Indicator (DPI) provides visual indication the filter is becoming clogged with debris; provides visual warning of impending filter By-Pass

A
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8
Q

Contaminated fluid is one of the most common cause of hydraulic system troubles

A

Most Common Filter – Micronic Type

Filtering Size 10 – 25 Microns

Disposable – treated cellulose with pleated paper.

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9
Q

Pump converts mechanical energy into hydraulic energy (in this case muscle)

A
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10
Q

HAND OPERATING HYDRAULIC PUMPS
Hand pumps – emergency (back-ups) if primary fails

A
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11
Q

HAND OPERATING HYDRAULIC PUMPS
Double action / Movement in either direction = flow

A
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12
Q

HAND OPERATING HYDRAULIC PUMPS

A
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13
Q

A filter is rated by the size of particles it will remove, and these sizes are measured in microns, with one micron equal to one millionth of a meter or 0.000039 inch.

A
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14
Q

POWER-DRIVEN HYDRAULIC PUMPS
Four Basic Types

A

Gear

Vane

Diaphragm

Piston

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15
Q

POWER-DRIVEN HYDRAULIC PUMPS
Pumps are coupled to their driving units using drive coupling

Shear Shaft
Drain Port Seal Drain – Shaft Seal Leaking

A
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16
Q

POWER-DRIVEN HYDRAULIC PUMPS Constant delivery – must have pressure relief valve

Angular

Cam

Variable delivery

Compensator – auto/instant varying fluid amount delivered to system

A
17
Q

CONSTANT-DELIVERY PUMPS

Given quantity of fluid per revolution, regardless of pressure demands

Require Pressure Regulator

TYPES

A
18
Q

CONSTANT-DELIVERY PUMPS

Gear pumps

Most common, versatile (small aircraft/power-pac)

Extreme Pressure – low volume

Fluid moves around the gears

A
19
Q

CONSTANT-DELIVERY PUMPS

Angular piston pumps

Cam piston pumps

Vane

Large volume – low pressure

A
20
Q

PISTON PUMPS (CONSTANT)

Referred as Axial Piston Pump

Stationary group and Rotating Group

Piston lines up with valve plate

Inlet port – draws fluid in

Outlet port – pushes fluid out

A

Angular Piston Pumps

21
Q

PISTON PUMPS (CONSTANT)

Rotating-cam

Cam Rotates, Cylinders stationary

Return spring pushes piston up bore for intake

Stationary-cam

Identical except cam stationary and cylinder block rotates

A

Cam-piston Pumps

22
Q

VARIABLE-DELIVERY
PISTON PUMP

Demand Principle cam pump

Compensator spring – moves spider/sleeves to cover relief holes in cylinder when pressure is required

Spider/sleeves uncover relief holes in cylinder with pressure is adequate.

A
23
Q

VARIABLE-DELIVERY
PISTON PUMP

Stroke Reduction pump

Compensator assembly mechanically controls the yoke (tilt of the cylinder block)

At full tilt=full flow

0 degree=zero flow

A
24
Q

ACCUMULATORS
Purpose

Dampen – Shocks/surges

Assist – peak operations/emergency

Absorb – thermal expansion

Preload – source of fluid pressure

A
25
Q

ACCUMULATORS
Accumulator has fluid on one side and nitrogen (N2) on other. Has a specific separator depending on style.

N2 Charge provides initial pressure against the separator

Fluid flows into lower chamber (by pump operation )

N2 provides constant expansion (pressure) against fluid

A
26
Q

ACCUMULATORS
Three types

Diaphragm

Bladder

Piston

A
27
Q

Two hollow hemispheres (bolted together) with a synthetic rubber diaphragm separating the two sides.

A

Diaphragm

28
Q

Sphere design with screw plug on bottom to insert bladder (balloon)

A

Bladder

29
Q

Bladder is pressurized with N2 and hydraulic fluid surrounds bladder

A
30
Q

PISTON ACCUMULATOR

Utilizes a free floating piston

N2 on air side and fluid on other

Drilled passage between fluid side and piston wall provide lubrication passage

A

Piston

31
Q

PISTON ACCUMULATOR

Reference Maintenance Manuals

Any fluid out of air valve = ruptured separator/seal

Remove all N2 and hydraulic pressure prior to servicing

A

Servicing all Accumulators

32
Q

AIR VALVES

Very high pressure held by a metal-to-metal seal.

To fill, open valve and add nitrogen

To release, open valve and depress core with proper tool

A

AN 6287-1

33
Q

AIR VALVES
Very high pressure held by metal seal has no valve core

Stem is retained in the body of the valve with a roll pin

To fill, install hose and open valve

To release, open valve very slowly and use caution

A

AIR VALVES

Hydraulics & Pneumatics(Airframes) (12 decks)

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