Airbus A340 – Pneumatic System - SmartCockpit - Airline training guides, Aviation, Operations, Safety

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.

True.

False.

Correct! Wrong!

The pneumatic system supplies high pressure air:

Only for air conditioning, engine start, and wing anti-icing.

For air conditioning, engine start, wing anti-icing, as well as for hydraulic and water reservoir pressurization.

Only for the hydraulic and water reservoir pressurization.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

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

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:

A FAULT light will appear only on the ENG BLEED p/b associated with the pylon leak and wing anti-ice must not be used.

A FAULT lights will appear on both ENG BLEED p/b associated with the closed Engine Bleed Valves.

Wing anti-ice may be used.

Correct! Wrong!

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

False.

True.

Correct! Wrong!

With an APU leak signal:

The X-Bleed Valve must be closed manually as soon as possible.

The APU Bleed Valve must be closed manually as soon as possible.

The APU Bleed Valve will close automatically.

Correct! Wrong!

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

False.

True.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

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

High pressure air is supplied from:

Engine and APU bleed systems.

Engine, APU and Air Starter Unit Bleed systems.

Engine bleed systems, APU load compressor, Two HP ground connections.

Correct! Wrong!

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

Engines Bleed Valves on left side are closed and Bleed Valves on the right side are opened.

All Engine Bleed Valves will open.

All Engine Bleed Valves will closed.

Correct! Wrong!

Each pneumatic system is designed to:

Please select 2 correct answers

Select the air source compressor stage, regulate bleed air pressure and bleed air temperature

Select the air source compressor stage and regulate bleed air pressure.

Select the air source compressor stage and regulate bleed air pressure via the BMCs (Bleed Monitoring Computers).

Correct! Wrong!

Airbus A340 – Pneumatic System