Pneumatics Flashcards
Where does the pneumatic system get its high temperature pressurized air from?
Engines, APU, or a ground air source
What is the type of air that is the primary source of bleed air?
Intermediate Pressure (IP) Air
What switch activation allows bleed air to be extracted from the engines?
L & R Bleed Air
What is the primary source of bleed air during ground operation?
APU
What system, located in the right aft equipment rack, makes the logical decisions required to maintain proper bleed air pressure and temperature by regulating, controlling, and monitoring?
The Air Management System Controller (AMSC)
Where is the APU air introduced into common supply manifold?
The right side of the isolation valve
What is the bleed air isolation valve used for?
Separate the left and right pneumatic manifold and to connect them as needed
Where does APU bleed air connect to the pneumatic system?
The right manifold only (due to air being introduced on R side of the isolation valve)
When does the Isolation valve open?
Anytime the APU bleed switch is on
What is the name of the bleed valves?
Manifold pressure regulating shut off valves (MPRSOV)
What do the MPRSOVs require to operate? To open?
Electrical power, and pneumatic pressure
Where is hot bleed air cooled? How?
In the precooler
Using engine fan air
Precooler outlet temperatures
WAI off - 400F+/-10F
In flight WAI-ON with two bleed sources - 450F+/-10F
In flight WAI-ON with one bleed source- up to 500F
When ground air is connected, why must the isolation valve be opened?
The connector is plumbed to the left side of the isolation valve, so it has to be open to get the air to the right engine
