AMT 125 MATERIALS

Question 1

Code of mineral oil

Answer 1

MIL-H-5606

Question 2

Large aircraft components;

Answer 2

landing gear are very heavy, imagine that it is difficult or even impossible to move these components manually.

Question 3

Synthetic oil is toxic to humans;

Answer 3

Use safety precautions when handling such as wearing gloves and goggles, If do you get it on your skin or in your eyes immediately wash it off with water, If you spill synthetic oil wash it off immediately, this is very important if it spills on tires, seals or metal because they are easily damaged by the fluid

Question 4

Boeing aircraft use prefix

Answer 4

BMS

Question 5

More hydroscopic than mineral oil and this is disadvantage. For all other characteristics, ___ performs better

Answer 5

Synthetic oil

Question 5

Purpose hydraulic system;

Answer 5

to activate and move these heavy components using hydraulic force, this removes unnecessary manual workload during flight and reduces the possibility of the pilot becoming tired

Question 6

Typical names for synthetic oil

Answer 6

Skydrol and Hyjet.

Question 7

Force is measured in units called ____

Answer 7

Newton’s

Question 8

Because gas is easily compressed

Answer 8

It is possible to transmit force using either gas or fluids

Question 9

Ability of oil to resist oxidation and deterioration for long period.

Answer 9

Chemical Stability

Question 10

Piston has not moved very much, because fluid is not easily compressed

Answer 10

Notice that to create the same pressure

Question 10

Describes its performance requirements, ability of oil to perform to a required standard through a range of changing conditions.

Answer 10

Synthetic Oil

Question 11

Has the tendency yo absorb water

Answer 11

Hydroscopic Quality

Question 11

amount of force that acts on a unit of area and is calculated by dividing force by the area it is acting upon

Answer 11

Pressure

Question 12

Airbus use

Answer 12

NSA

Question 12

Fluids pressurize quickly and transmit force more efficiently

Answer 12

In comparison to gas

Question 13

made from natural substances

Answer 13

Mineral Oil

Question 14

Colored violet and is widely used in modern aircraft

Answer 14

Synthetic Oil

Question 14

which of course is man-made

Answer 14

Synthetic oil

Question 15

The are different manufacturers of_____ but all types of ____ can be mixed. However this can’t be mixed with mineral oil

Answer 15

Synthetic Oil

Question 15

pressure produced by moving liquids ideally with no internal friction.

Answer 15

Hydrodynamic pressure

Question 16

Performance requirement is dependent on following oil characteristics:

Answer 16

Low flammability, good lubricant, non-freezing, non-evaporating, non-foaming, chemical stability, hydroscopic

Question 17

type of pressure used in an aircraft hydraulic system

Answer 17

Hydrostatic pressure

Question 17

Two types of hydraulic fluid are available:

Answer 17

Mineral oil, synthetic oil

Question 18

This changes freezing and lubrication characteristics

Answer 18

Hydroscopic Quality

Question 18

two types of hydraulic pressure:

Answer 18

Hydrostatic pressure, hydrodynamic pressure

Question 19

Performance requirement is dependent on the following oil characteristics:

Answer 19

Low flammability, Good lubricating quality, Resistance to freezing, non evaporating, non foaming, chemical stability, ability of oil to resist oxidation and deterioration for long periods. reduced the need for frequent oil changes

Question 20

Pressure produced by static or nearly static fluids.

Answer 20

Hydrostatic Pressure

Question 21

when a force is applied to the piston on gas container, there is much movement of piston.

Answer 21

It is possible to transmit force using either gas or fluids

Question 22

The are different manufacturers of_____ but all types of ____ can be mixed together and colored red

Answer 22

Mineral Oil

Question 23

Reduces the need for frequent oil changes.

Answer 23

Chemical Stability

Question 24

Prevent leaks from the component housings and provide a seal between 2 different fluid pressures within a component

Answer 24

Packing's (Seals)

Question 25

Packing is used to make a seal between environment and fluid pressure inside it.

Answer 25

Component housing such as filter.

Question 26

A single seal by itself may not be strong enough.

Answer 26

In a system areas where there is high differential pressure

Question 27

another type of packing which helps to support the seal

Answer 27

Backup Ring

Question 28

Manufactured from different materials depending on the job they do and whether they are used with mineral or synthetic fluid

Answer 28

Packing's

Question 29

also acts as a seal.

Answer 29

Backup Ring

Question 30

From Teflon or Nylon

Answer 30

Backup Rings

Question 31

Packing's are available in a number of different shapes:

Answer 31

Depending on forces which act on them, their function or type of fit.

Question 32

Leakage problems are solved

Answer 32

By using a packing such as O-ring

Question 34

used to seal against steady or pulsating pressure, this type of seal that we saw earlier in the filer housing.

Answer 34

Static seals

Question 35

Two similar seals placed in different types of hydraulic fluid;

Answer 35

Seals can be damaged by using them with wrong type of hydraulic fluid, shows a increase in the size of seal due to contact with wrong fluid

Question 36

Used to seal where stroking or rotational movements occur

Answer 36

Dynamic Seals

Question 37

When choosing seals;

Answer 37

consider working temperatures and strength of forces that act upon them, ensure that the seal is the correct on for the job always refer to the part number on their boxes for identification.

Question 38

Usually made from rubber materials

Answer 38

Seals

Question 40

All modern aircraft hydraulic systems are similar in principle:

Answer 40

User, Pressurization