12 Questions
With engines and APU running and APU bleed valve selected on, select the correct statement:
Engine bleed valves close, x-bleed valve opens, APU bleed valve opens
To start an engine with external pneumatic power, the following switching is required:
Engine and APU bleed OFF, Pneumatic x-bleed OPEN
Air bleed from the engines is:
Cooled in a heat exchanger by cooling air bleed from the fan section
High pressure air is supplied from:
Engine 1 and 2 bleed systems, APU load compressor, and HP ground connection
Pneumatic system operation is controlled and monitored by:
Two bleed monitoring computers
Which source operates the bleed valve:
Pneumatic
What happens when pressure and temperature are not sufficient to supply the corresponding engine bleed valve:
HP valve opens, Bleed valve remains in the same configuration, IP check valve closes
Can you control the HP valve position through the air bleed cockpit push button?
No
If the bleed valve closes, the HP valve:
Closes automatically
Temperature regulation is achieved by the precooler which regulates and limits the temperature at:
200 ̊C
Which source controls the x-bleed valve:
Electric
Cross-bleed valve is provided with two electric motors:
One for the automatic mode, the other for the manual mode
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