AMT 125 MATERIALS Flashcards
Code of mineral oil
MIL-H-5606
Large aircraft components;
landing gear are very heavy, imagine that it is difficult or even impossible to move these components manually.
Synthetic oil is toxic to humans;
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
Boeing aircraft use prefix
BMS
More hydroscopic than mineral oil and this is disadvantage. For all other characteristics, ___ performs better
Synthetic oil
Purpose hydraulic system;
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
Typical names for synthetic oil
Skydrol and Hyjet.
Force is measured in units called ____
Newton’s
Because gas is easily compressed
It is possible to transmit force using either gas or fluids
Ability of oil to resist oxidation and deterioration for long period.
Chemical Stability
Piston has not moved very much, because fluid is not easily compressed
Notice that to create the same pressure
Describes its performance requirements, ability of oil to perform to a required standard through a range of changing conditions.
Synthetic Oil
Has the tendency yo absorb water
Hydroscopic Quality
amount of force that acts on a unit of area and is calculated by dividing force by the area it is acting upon
Pressure
Airbus use
NSA
Fluids pressurize quickly and transmit force more efficiently
In comparison to gas
made from natural substances
Mineral Oil
Colored violet and is widely used in modern aircraft
Synthetic Oil
which of course is man-made
Synthetic oil
The are different manufacturers of_____ but all types of ____ can be mixed. However this can’t be mixed with mineral oil
Synthetic Oil
pressure produced by moving liquids ideally with no internal friction.
Hydrodynamic pressure
Performance requirement is dependent on following oil characteristics:
Low flammability, good lubricant, non-freezing, non-evaporating, non-foaming, chemical stability, hydroscopic
type of pressure used in an aircraft hydraulic system
Hydrostatic pressure
Two types of hydraulic fluid are available:
Mineral oil, synthetic oil
This changes freezing and lubrication characteristics
Hydroscopic Quality
two types of hydraulic pressure:
Hydrostatic pressure, hydrodynamic pressure
Performance requirement is dependent on the following oil characteristics:
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
Pressure produced by static or nearly static fluids.
Hydrostatic Pressure
when a force is applied to the piston on gas container, there is much movement of piston.
It is possible to transmit force using either gas or fluids
The are different manufacturers of_____ but all types of ____ can be mixed together and colored red
Mineral Oil
Reduces the need for frequent oil changes.
Chemical Stability
Prevent leaks from the component housings and provide a seal between 2 different fluid pressures within a component
Packing’s (Seals)
Packing is used to make a seal between environment and fluid pressure inside it.
Component housing such as filter.
A single seal by itself may not be strong enough.
In a system areas where there is high differential pressure
another type of packing which helps to support the seal
Backup Ring
Manufactured from different materials depending on the job they do and whether they are used with mineral or synthetic fluid
Packing’s
also acts as a seal.
Backup Ring
From Teflon or Nylon
Backup Rings
Packing’s are available in a number of different shapes:
Depending on forces which act on them, their function or type of fit.
Leakage problems are solved
By using a packing such as O-ring
used to seal against steady or pulsating pressure, this type of seal that we saw earlier in the filer housing.
Static seals
Two similar seals placed in different types of hydraulic fluid;
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
Used to seal where stroking or rotational movements occur
Dynamic Seals
When choosing seals;
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.
Usually made from rubber materials
Seals
All modern aircraft hydraulic systems are similar in principle:
User, Pressurization
