Bleed Air Flashcards
What is the bleed air used for?
air con, pressurization, anti ice, and engine start. As well as pressurizing water tanks and hydraulic tanks.
Where does bleed air come from on the ground and in the air?
APU, external, engines
in air, engines only.
Where is the pneumatic pressure indicated and what does it show?
air con panel, pressure in PSI from common duct
When is HP air normally used?
during idling (less then 80% n2) and during anti icing.
What valve normally regulates duct pressure?
PR/SO
What protection is there against duct over pressure in case of the PR/SO valve failing?
the OP/SO
How and when is bleed air temperature controlled?
when anti icing is selected on. its controlled by the modulating function o the HP bleed valve.
What happens to the system at high engine thrust or when TOGA is activated?
HP is inhibited at take off power and 60 seconds if TOGA is selected.
What valve will close if a duct overheat situation occurs?
Will automatically close HP bleed valve, and PR/SO valve and a alert will be presented.
What valve will close in case of a duct leak?
HP bleed, PR/SO and OP/SO valves automatically close and alert will be presented.
What happens to the system if a fire handle is pulled?
the respective engine bleed air system is shut off op so
What level alert is a double bleed fault?
2
bleed 1 and 2.
What causes an APU BLEED message to be displayed?
APU bleed valve failed on ground.
When would APU BLEED VALVE show
APU bleed valve failed in flight
What is the result of reverse flow through the APU check valve?
Same result as Leak. may enter into the APU and cause damage.
