A330 Pneumatic Flash Cards
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The pneumatic system supplies high pressure air for:
- Air Conditioning, water pressurization and engine starting
- Wing anti-icing.
- Hydraulic reservoir pressurization.
High pressure air has ______ sources.
- Engine bleed systems
- APU load compressor
- HP ground connection.
With both engines operating, an ENG BLEED pb FAULT light will illuminate when:
The valve position differs from that of the push button.
Air bleed from the engines is:
Cooled in a heat exchanger by cooling air bleed from Fan section.
The bleed valve is fully close electrically through the BLEED pushbutton during starting sequence.
If a Bleed Monitoring Computer (BMC) fails:
The remaining BMC will automatically assume most of the failed BMC's functions.
Each engine bleed system is designed to:
- Select the air source compressor stage.
- Regulate bleed air pressure.
- Regulate bleed air temperature.
A leak detection system detects any overheating in the vicinity of hot air ducts.
For engine start, air supplied from the ground air source:
Is not regulated.
When engine and wing anti-ice are in use, and a BMC detects a bleed leak:
The wing anti-ice on the associated side will be lost, and the engine anti-ice on the associated side will continue to function.
A BMC detects a bleed leak Air leakage is based on:
Single loop for pylon and APU and double loops for wings.
Each bleed valve is electrically operated and controlled pneumatically by its associated BMC.
- Each bleed valve is pneumatically operated and controlled electrically by its associated BMC.
If a BMC detects a bleed leak:
All valves that could supply pneumatic air to the area of the bleed leak will automatically close.
If one BMC fails, the adjacent BMC takes over the monitoring of the bleed system to issue the following ECAM warnings if necessary:
- Wing leak
Bleed leak protection for the APU pneumatic duct is provided by:
Detection loops associated with BMC #1.
With the loss of pneumatic system pressure, the engine bleed valve will:
Assume the closed position.
The APU bleed supply is controlled by the APU Electronic Control Box (ECB).
Pneumatic system operation is controlled and monitored by:
- Two Bleed Monitoring Computers (BMC).
- Each engine bleed system is controlled and monitored by one dedicated Bleed Monitoring Computer (BMC)
ECAM BLEED page: when is the GND symbol displayed?
Whenever the aircraft is on the ground.
If one BMC is failed, the other BMC takes over monitoring of the bleed system and ensures which ECAM warning?
- ENG BLEED FAULT
- WING LEAK
- BLEED LO TEMP
The precooler inlet pressure indication, on the ECAM Bleed page, becomes amber if lower than _____ psi or in case of overpressure detected by the BMC.
In automatic mode, the rossbleed valve opens when the system is using APU bleed air.
It closes if the system detects an air leak (except during engine start).
Engine bleed systems are interconnected by a crossbleed duct to which the APU and ground sources are connected.
What happens when pressure and temperature are not sufficient to supply the corresponding engine bleed valve?
HP valve opens, IP stage remains in the same configuration.
When additional pneumatic air is required for anti-ice, engine starting, or air conditioning:
Additional pneumatic air will be requested by the BMC to the FADECs or the APU.
When selected, APU bleed air:
Has priority over engine bleed air.
The Precooler outlet temperature visible on the ECAM is normally in green. It becomes amber, if the BMC detects an overheat or low temperature.
- Low temperature is lower than 150�C.-
- Over temperature if more than:
- a) 290�C for more than 5 seconds
- b) 270� for more than 15 seconds.
- c) 257�C for more than 55 seconds.
With the APU running, the APU BLEED push button selected ON and the X BLEED selector to AUTO, the APU will:
Supply pneumatic air to both sides of the aircraft because the pneumatic crossbleed valve automatically opens.
Which source controls the crossbleed valve?
The crossbleed valve is automatically controlled to:
Open when the APU bleed is selected ON, and closed when a leak is detected.
The crew may directly control the following bleed valves:
Engine, APU, crossbleed.
APU bleed air supplies the pneumatic system if the APU speed is above _____:
A check valve near the crossbleed duct protects the APU when bleed air comes from another source:
Following an ENGINE 1 BLEED FAULT, why can you only use one pack if Wing Anti Ice (WAI) is on?
- Only ENG BLEED system cannot supply 2 packs and WAI.
- One engine bleed system can either supply both packs or one pack plus WAI.
Temperature regulation is achieved by the precooler which regulates and limits the temperature at:
How many ground units can be connected to the crossbleed duct?
One or two.
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