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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.
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High pressure air has ______ sources.
- 3
- Engine bleed systems
- APU load compressor
- HP ground connection.
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With both engines operating, an ENG BLEED pb FAULT light will illuminate when:
The valve position differs from that of the push button.
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Air bleed from the engines is:
Cooled in a heat exchanger by cooling air bleed from Fan section.
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The bleed valve is fully close electrically through the BLEED pushbutton during starting sequence.
False.
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If a Bleed Monitoring Computer (BMC) fails:
The remaining BMC will automatically assume most of the failed BMC's functions.
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Each engine bleed system is designed to:
- Select the air source compressor stage.
- Regulate bleed air pressure.
- Regulate bleed air temperature.
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A leak detection system detects any overheating in the vicinity of hot air ducts.
True.
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For engine start, air supplied from the ground air source:
Is not regulated.
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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.
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A BMC detects a bleed leak Air leakage is based on:
Single loop for pylon and APU and double loops for wings.
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Each bleed valve is electrically operated and controlled pneumatically by its associated BMC.
- False
- Each bleed valve is pneumatically operated and controlled electrically by its associated BMC.
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If a BMC detects a bleed leak:
All valves that could supply pneumatic air to the area of the bleed leak will automatically close.
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If one BMC fails, the adjacent BMC takes over the monitoring of the bleed system to issue the following ECAM warnings if necessary:
- Overpressure
- Overtemperature
- Wing leak
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Bleed leak protection for the APU pneumatic duct is provided by:
Detection loops associated with BMC #1.
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With the loss of pneumatic system pressure, the engine bleed valve will:
Assume the closed position.
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The APU bleed supply is controlled by the APU Electronic Control Box (ECB).
True.
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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)
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ECAM BLEED page: when is the GND symbol displayed?
Whenever the aircraft is on the ground.
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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
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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.
4
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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).
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Engine bleed systems are interconnected by a crossbleed duct to which the APU and ground sources are connected.
True.
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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.
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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.
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When selected, APU bleed air:
Has priority over engine bleed air.
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The Precooler outlet temperature visible on the ECAM is normally in green. It becomes amber, if the BMC detects an overheat or low temperature.
- False
- 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.
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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.
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Which source controls the crossbleed valve?
Electric.
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The crossbleed valve is automatically controlled to:
Open when the APU bleed is selected ON, and closed when a leak is detected.
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The crew may directly control the following bleed valves:
Engine, APU, crossbleed.
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APU bleed air supplies the pneumatic system if the APU speed is above _____:
95%
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A check valve near the crossbleed duct protects the APU when bleed air comes from another source:
True.
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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.
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Temperature regulation is achieved by the precooler which regulates and limits the temperature at:
200�C
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How many ground units can be connected to the crossbleed duct?
One or two.
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