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Hydraulics and Landing Gear > Lesson 6: Accumulators and Actuators > Flashcards

Lesson 6: Accumulators and Actuators Flashcards

1
Q

What component provides stored air pressure which gives hydraulic flow potential?

A

ACCUMULATOR

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2
Q

What is the purpose of and ACCUMULATOR?

A

dampen/absorb hydraulic surges
constant pressure
help pump under peak pressure
backup brakes

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3
Q

What are the types of ACCUMULATORS?

A

Piston
Bladder
Diaphragm
Metal Bellows

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4
Q

This type of accumulator has a free floating piston and must be charged with 1/3 or 1/2 the normal system fluid operating pressure

A

Piston Type

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5
Q

How does the Piston type work?

A

inlet fluid forces the piston down increasing AIR pressure which FORCES piston back UP to maintain system pressure

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6
Q

This type of accumulator uses a SYNTHETIC bladder that inflates with air pressure

A

BLADDER type

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7
Q

This type of accumulator uses a RUBBERIZED diaphragm to seprate air an hydraulic chambers

A

DIAPHRAGM type

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8
Q

The difference between the bladder/diaphragm and the piston is what?

A

Piston slides, the others FLEX

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9
Q

This type of accumulator is for very high pressure, does not corrode and is maintenance free

A

Metal Bellows type

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10
Q

There must be no ________ pressure on hydraulic side of accumulator when charging (pressurizing) the accumulator with a gas

A

hydraulic system psi

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11
Q

Purpose of an Schrader Valve?

A

pressurize and depressurize

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12
Q

What is the first thing you do when charging an accumulator?

A

MM for pressure, gas, caution, procedure

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13
Q

Safety wise, what should you make sure of?

A

Calibration sticker current
Correct regulator
Closed both valves
Correct gas

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14
Q

What component does the work?

A

Actuators

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15
Q

What are the 2 types of actuators?

A

Linear and Rotary

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16
Q

What are the 3 type of LINEAR actuators?

A

Single
Double unbalanced
Double balanced

17
Q

This type of actuator has its piston only moving in one direction and returned by a spring

A

SINGLE acting

18
Q

Double acting Unbalanced actuators are commonly used for what?

A

Flight Controls and Landing Gear

19
Q

This type of actuator is used when equal force is required such as flight control actuators and auto pilot servos

A

Double Acting Balanced

20
Q

Cushioned Gear Type Actuators do what?

A

Cushions and Slows

21
Q

What is specific to the Lock Type Actuator?

A

Locking pin and ball

22
Q

2 types of Rotary actuators?

A

Rack and pinion

Hydraulic motor

23
Q

Rack and pinion types are used for what?

A

small aircraft landing gear

24
Q

This type of actuator we use where continuous rotational force is required such as PDU AND PTUs

A

Hydraulic Motor

25
Q

How does the Hydraulic Motor actuator work?

A

piston down = shaft rotate

26
Q

How can we verify INTERNAL actuator leaks?

A

leaky actuator hot
NDT
pressure decay
shop bench test

Hydraulics and Landing Gear (10 decks)

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