Pnumatics Flashcards
Where do you find pressure reg valve
(Engine bleed valve) upstream of pre cooler
Where does bleed air come from
Engine compressor
What is the pneumatic bleed air used for
Air con , engine start , and resivouirs
Purpose of pneumatic controllers
Monitor pressure temp , register leaks , monitor operation of pneumatic controllers
How many pneumatic controllers for each engine bleed system
1 per engine
How is pnuematic vaccine pressured on ground
Via high pressure ground connectors
What’s the pressure in most systems
45psi
What type of valve is the bleed
Butterfly type valve , spring loaded
What does check valve do
Prevent back flow
What the purpose of pre cooler
Cool engine bleed air temperature
What does the fan air valve do
Allow more or less fan air to pass through pre cooler
If the mass of air is constant what effect does it have on cooling effect
It is constant as well
What does the pre cooler cooling effect depend on
Mass and temp
How are pneumatic ducts monitored
Leak detection system
How is control of pnuemanic system achieved manually
Control panel in cockpit
How is control of pnuematic system achieved automatically
Pnuematic controller
Where is bleed valve operated manually
Switch in cockpit
What measures temp in bleed valve
Thermostat
Where is thermostat located
Downstream of pre cooler
What does bleed valve do
Main part which regulates bleed air from engine
When is reverse flow through bleed valve allowed
Only during engine start
When is over pressure valve closed
85psi
What monitors temp reg pre cooler
Temperature sensor
What happens when there’s a malfunction on the temperature regulator pre cooler
System fault which is illuminated on bleed panel in cockpit
