Airbus A350 - Bleed air

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:

Engine and Wind anti-ice are off.

Wing anti-ice is off.

Engine anti-ice is off.

Correct! Wrong!

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.

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.

True.

False.

Correct! Wrong!

Using air from the IP compressor minimizes fuel consumption.

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

True.

False.

Correct! Wrong!

The ECAM will trigger a leak alert, in case:

Both loops detect an ambient overheat.

Both loops detect an ambient overheat, or a fire.

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

Correct! Wrong!

In the case of a wing or APU bleed leak:

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

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

The crossbleed valve is closed if necessary.

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!

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

Air conditioning and cabin pressurization.

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

Air conditioning, ventilation and cabin pressurization.

Correct! Wrong!

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

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

within the aircraft flight envelope.

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.

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

False.

True.

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.

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 smoke procedure, the engine bleed valve automatically closes.

True.

False.

Correct! Wrong!

Airbus A350 – Bleed air

Quiz

Airbus A350 - Bleed air

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:

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

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.

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

The ECAM will trigger a leak alert, in case:

In the case of a wing or APU bleed leak:

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

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

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

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

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 smoke procedure, the engine bleed valve automatically closes.