pneumatic

• Pneumatic system


  Deals with compressed or pressured gas as a source of power
• Normally the gas used in pneumatics is air
• Uses of pneumatic energy on aircraft


  • Engine starting
  • Cabin pressurization and air conditioning
  • Wing anti-icing
  • Water reservoir pressurization
  • Hydraulic reservoir pressurization
• Pneumatic system on jet aircraft

  • There is a very good air source available
  • The engine compressor provides enough air for combustion purposes and also for the pneumatic system
• Engine Bleed Air (EBA)

  Compressed air bled from the engines
• Air sources for pneumatic system

  • Engine bleed air
  • Auxiliary power unit (APU)
  • External air via High Pressure Ground Connectors
• Pneumatic air distribution


  1. Via ducts

  2. Pylon duct

  3. Left and right wing ducts

  4. APU duct

  5. Crossover duct or cross-bleed manifold
• Cross-bleed valve


  Isolates the left from the right wing pneumatic duct
• Bleed valve


  Pressure regulator that maintains a constant level of pressure and regulates the engine bleed air supply at high engine speeds
• At high engine speed the engine bleed air pressure is regulated
• In a situation when the engine thrust is at idle a second engine bleed port is used
• Temperature regulation in pneumatic system

  • Built-in precooler used to cool the engine bleed air temperature
  • Cooling air taken from the engine fan duct
• The cooling effect depends on the mass and temperature of fan air
• HP Ground Connector


  Provides external air to the pneumatic system when the aircraft is on the ground
• ECAM Control Panel


  Interface for the ECAM system
• Air conditioning system


  Supplied by the pneumatic system