hydraulics Flashcards
minimum amount of hydraulics required
2
what does check valve do
allow fluid to flow in one direction
what are hydraulics measured in
Psi
purpose of leak measurement solenoid valve in regard to hydraulic system
shuts down hydraulic fluid when leak is detected , it closes supply line
Do aircraft’s use hydrostatic or hydrodynamic
Hydrostatic
How is hydrostatic pressure developed
Static or nearly static fluids
How is hydrodynamic pressure developed
By flow in a system
How much is 1 bar in psi
14.5
How much is 1 Dan cm2 in kpa
100kpa
How much bar is 3000 psi
207 bar
Disadvantage of synthetic oil
More hydrophobic then mineral
Boeing hydraulic fluid
Bms
Airbus hydraulic fluid
Nsa
What are seals made of
Rubber
What is backup ring made of
Teflon
When is an o-ring used
When over 1500 psi
Difference between static and dynamic seal
Static uses 1 seal , whereas dynamic uses more then one
Resouvoir pressure
50psi
When is ground access panel accessed
Only on ground
In a variable displacement pump when is used to stop movement
Wobble plate or yoke
In electrical pumps how is the motor cooled
By air or hydraulic fluid
When is a demand pump used
When edps can’t maintain pressure
How does a ram air turbine work
Hydraullically retracted and deployed within 1 second
Purpose of hp filter
Protect system from debris
Colour of priority valve
Red
What does a priority valve do
Close circuit to different users when in demand to protect high value users
What is the purpose of an accumulator
Dampener and smoothen out pressure fluctuations
What does the low pressure manifold do
Combines fluid from all feeds for return to reservoir
Hose inner tube material
Teflon
You can mix mineral and synthetic oil true or false
False
Oil specification for mineral oil
MIL-H-5606
When is a static seal used
Used against steady or pulsating force
When is dynamic seal used
Stroking or rotational movements occur
Each resovoir has its own depression valve (bleed) true or false
True
Purpose of check valve
Prevents flow into manifold
Civil aircraft hydraulic working pressure
3000psi
Synthetic oil hydraulic fluid colour
Violet
Where is the depression valve for hydraulic reservoir
Ground service panel
