Airbus A350 - Bleed air

In flight, the APU can supply bleed air for air conditioning and pressurization:

within the aircraft flight envelope.

Up to 22 500 ft (6 858 m) for dual pack operation.

Up to 25 000 ft (7 620 m) for dual pack operation

Correct! Wrong!

Up to 25 000 ft (7 620 m) for single pack operation.

A precooler regulates the temperature and pressure of each engine bleed.

False.

True.

Correct! Wrong!

The precooler is an air-to-air heat exchanger, mounted downstream of the engine bleed valve. It uses cooling air, that is bled from the engine fan. The transferred heat is subsequently returned to the engine core and vented overboard.

The ECAM will trigger a leak alert if one loop detects an ambient overheat.

True.

False.

Correct! Wrong!

The ECAM will trigger a leak alert, in case: both loops detect an ambient overheat, or one loop detects an ambient overheat, and the other one is inoperative.

The Bleed Air System (BAS) supplies high-pressure air to the:

Air conditioning and cabin pressurization.

Air conditioning, ventilation and cabin pressurization.

Air conditioning, the cabin pressurization and the fuel tank inerting.

Correct! Wrong!

When any of the HP ground sources is connected, all systems can receive bleed air.

False.

True.

Correct! Wrong!

In the case of a smoke procedure, the engine bleed valve automatically closes.

False.

True.

Correct! Wrong!

A non-return valve, located near the crossbleed duct, protects the APU when air is bled from another source.

False.

True.

Correct! Wrong!

To obtain the selected temperature in the cabin zones, the precooler regulates bleed air temperature to approximately 200 deg.C. However, depending on the demand, the bleed air temperature can be regulated down to 150 deg.C, provided that:

Wing anti-ice is off.

Engine and Wind anti-ice are off.

Engine anti-ice is off.

Correct! Wrong!

When a leak is detected in the left or right wing anti-ice bleed duct (downstream the wing anti-ice valve), the affected both wing anti-ice valve automatically closes.

True.

False.

Correct! Wrong!

When a leak is detected in the left or right wing anti-ice bleed duct (downstream the wing anti-ice valve), BOTH wing anti-ice valves automatically close. The wing anti-ice is no longer available.

In the case of a wing or APU bleed leak:

The affected bleed duct is isolated, by maintaining the crossbleed valve closed.

The affected bleed duct stays open, but the crossbleed valve is closed.

The crossbleed valve is closed if necessary.

Correct! Wrong!

The ECAM will trigger a leak alert, in case:

Both loops detect an ambient overheat, or a fire.

Both loops detect an ambient overheat.

Both loops detect an ambient overheat, or ne loop detects an ambient overheat, and the other one is inoperative.

Correct! Wrong!

Engine bleed air usually comes from the Intermediate Pressure (IP) compressor of the engine. The pressure of the IP compressor is sufficiently high to supply pressurized air to the system users, except at low thrust settings.

False.

True.

Correct! Wrong!

Using air from the IP compressor minimizes fuel consumption.

Airbus A350 – Bleed air

Quiz

Airbus A350 - Bleed air

In flight, the APU can supply bleed air for air conditioning and pressurization:

A precooler regulates the temperature and pressure of each engine bleed.

The ECAM will trigger a leak alert if one loop detects an ambient overheat.

The Bleed Air System (BAS) supplies high-pressure air to the:

When any of the HP ground sources is connected, all systems can receive bleed air.

In the case of a smoke procedure, the engine bleed valve automatically closes.

A non-return valve, located near the crossbleed duct, protects the APU when air is bled from another source.

To obtain the selected temperature in the cabin zones, the precooler regulates bleed air temperature to approximately 200 deg.C. However, depending on the demand, the bleed air temperature can be regulated down to 150 deg.C, provided that:

When a leak is detected in the left or right wing anti-ice bleed duct (downstream the wing anti-ice valve), the affected both wing anti-ice valve automatically closes.

In the case of a wing or APU bleed leak:

The ECAM will trigger a leak alert, in case:

Engine bleed air usually comes from the Intermediate Pressure (IP) compressor of the engine. The pressure of the IP compressor is sufficiently high to supply pressurized air to the system users, except at low thrust settings.