Pneumatics Flashcards
Which aircraft systems uses the pneumatic supply?
- Packs
- Wing Anti-Ice
- Hydraulic reservoir
- Water tank
- Cargo heat
How many Bleed Monitoring Computers are installed?
2
Where do the APU bleed and ground source connect to the bleed system?
The crossbreed duct
When does the HP valve open?
At low pressures to maintain 32-40 psi
What is the air source for the pre-cooler?
Fan air
What is the purpose of the pre-cooler?
Cools and limits bleed air temperature to 200°C
When does the Engine Bleed air valve open?
- Eng bleed pushbutton ON
- Bleed pressure >8psi
- APU bleed air valve closed
- No faults
- ENG FIRE pushbutton in
- Engine start valve closed
What is the significance of an ENG BLEED “FAULT” light with associated ECAM?
- Bleed over pressure
- Bleed over temperature
- Wing or pylon pneumatic leak
- Engine bleed valve not closed during engine start
- Engine bleed valve not closed with APU bleed on
Where are the bleed pressure and temperature measured?
Pressure: Pre-cooler inlet
Temperature: Pre-cooler outlet
How is the engine bleed pressure regulated?
Using the bleed valve as a Pressure Regulating Valve
Is the APU bleed pressure regulated through the bleed valve?
No. APU bleed valve is only shutoff.
What is the significance of an APU bleed FAULT light?
APU bleed leak
What is the normal position of the crossbleed valve with both engines running?
Closed
When does the crossbleed valve open with the switch in AUTO?
- APU bleed on
- APU running
- Engine bleed valves will close
Where are bleed detection loops installed?
- Fuselage
- Pylons
- Wings
- APU duct
