14 Pneumatic System

13問 • 4ヶ月前

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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 provide external air for ENG start the following switching is required:

Pneumatic X-bleed OPEN

Air bleed from the engines is:

cooled in a heat exchanger by cooling air bleed from fan section

High pressure air is supplied from:

Engine 1 and 2 bleed systems, APU load compressor, 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 opened, IP stage remains in the same configuration

Can you control the HP valve position through the air bleed cockpit panel?

If the bleed valve closes, the HP valve:

closes automatically

Temperature regulation is achieved by the precooler which regulates and limits the temperature at:

200ºC

Which source controls the crossbleed valve:

Electric

Cross-bleed valve is provided with 2 electrical motors:

one for the automatic mode, the other one for the manual mode

In case of low upstream pressure, the high pressure valve (HP valve) is:

pneumatically closed

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