Copyright D.P. Browne 2011

 

 

 

 

Home.Cockpit.Aircraft Systems.Worked Example.Program Controls.Before Flight.

Pneumatics Bleed Air System Controls

 

APU

Bleed

Air

 

Eng 1 Bleed Valve

 

Cross bleed Valve

 

Eng 2 Bleed Valve

 

The controls for the bleed system appear on the Air panel overhead. The controls are the Bleed On/Off buttons for the two engines and APU.  And the cross bleed valve control.

 

Engine Bleed On/Off buttons

Associated bleed valve is controlled by the BMC.

 

 

In

 

Associated bleed valve failure

 

 

FAULT

 

Associated bleed valve is closed

 

 

OFF

 

Associated bleed valve is closed.

 

 

Out

 

APU Bleed On/Off buttons

Associated bleed valve is controlled by the BMC.

 

 

In

 

Associated bleed valve failure

 

 

FAULT

 

Associated bleed valve is open and APU supplying bleed air

 

 

ON

 

Associated bleed valve is closed.

 

 

Out

 

Cross bleed Knob

Cross feed valve closed regardless of the BMC

 

 

Closed

 

Cross feed valve open regardless of the BMC

 

 

Open

 

Cross feed valve under the control of the BMC

 

 

Auto

 

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Bleed Air
Indications