Lesson 6: Accumulators and Actuators

Question 1

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

Answer 1

ACCUMULATOR

Question 2

What is the purpose of and ACCUMULATOR?

Answer 2

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

Question 3

What are the types of ACCUMULATORS?

Answer 3

Piston
Bladder
Diaphragm
Metal Bellows

Question 4

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

Answer 4

Piston Type

Question 5

How does the Piston type work?

Answer 5

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

Question 6

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

Answer 6

BLADDER type

Question 7

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

Answer 7

DIAPHRAGM type

Question 8

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

Answer 8

Piston slides, the others FLEX

Question 9

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

Answer 9

Metal Bellows type

Question 10

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

Answer 10

hydraulic system psi

Question 11

Purpose of an Schrader Valve?

Answer 11

pressurize and depressurize

Question 12

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

Answer 12

MM for pressure, gas, caution, procedure

Question 13

Safety wise, what should you make sure of?

Answer 13

Calibration sticker current
Correct regulator
Closed both valves
Correct gas

Question 14

What component does the work?

Answer 14

Actuators

Question 15

What are the 2 types of actuators?

Answer 15

Linear and Rotary

Question 16

What are the 3 type of LINEAR actuators?

Answer 16

Single
Double unbalanced
Double balanced

Question 17

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

Answer 17

SINGLE acting

Question 18

Double acting Unbalanced actuators are commonly used for what?

Answer 18

Flight Controls and Landing Gear

Question 19

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

Answer 19

Double Acting Balanced

Question 20

Cushioned Gear Type Actuators do what?

Answer 20

Cushions and Slows

Question 21

What is specific to the Lock Type Actuator?

Answer 21

Locking pin and ball

Question 22

2 types of Rotary actuators?

Answer 22

Rack and pinion

Hydraulic motor

Question 23

Rack and pinion types are used for what?

Answer 23

small aircraft landing gear

Question 24

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

Answer 24

Hydraulic Motor

Question 25

How does the Hydraulic Motor actuator work?

Answer 25

piston down = shaft rotate

Question 26

How can we verify INTERNAL actuator leaks?

Answer 26

leaky actuator hot NDT pressure decay shop bench test