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Air is normally bled from the intermediate pressure stage (IP) of engine HP compressor, to minimize fuel penalty.

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The pneumatic system supplies high pressure air:

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The LH and RH bleed valves are pneumatically-controlled by BMC1 and BMC2 respectively, and are electrically-operated.

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The LH and RH bleed valves are electrically-controlled by BMC1 and BMC2 respectively, and are pneumatically-operated.

If an engine bleed pylon leak is detected, both bleed valves on same side will close, the X-Bleed Valve will receive a closure signal, and:

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With an APU leak signal:

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High pressure air is supplied from:

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A leak detection system is provided to detect and locate any overheat in the vicinity of the hot air ducts.

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Each pneumatic system is designed to:

Please select 2 correct answers

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With APU supplying the pneumatic system and X-Bleed Valve set on Close position:

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Each pneumatic system is controlled and monitored by two Bleed Monitoring Computer (BMC) channels.

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Each system is controlled and monitored by one Bleed Monitoring Computer (BMC) channel.

Air is supplied to the aircraft’s pneumatic system via two HP ground connectors. The crossbleed valve has to be opened manually to provide air for both sides.

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Airbus A340 – Pneumatic System