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OBOGS for figther aircrafts  [ Return towards  On-board oxygen generating systems  ]

Unparalleled performance guaranteed through a unique electromechanical design

This autonomous generation system generates oxygen enriched air directly and in unlimited amounts on board fighter aircraft or training aircraft, to meet all the physiological needs (breathable gas and anti-g protection) of one or two pilots, however long or complex the assignment they are on.

(© Air Liquide / Photo Patrick Avavian)The on-board oxygen generation system or OBOGS is designed to satisfy the breathing needs of one or two airline pilots, to protect them against accelerations or BC attacks. The essential difference between an OBOGS on a fighter aircraft and one on a training aircraft is in the architecture, which is more complex on fighter aircraft.

The oxygen and anti-G regulation system based on Air Liquide’s OBOGS electromechanical technology dispenses the gas faster and more accurately than equipment of purely mechanical design. Non-linear servo-control laws can also be applied.
Moreover, system diagnosis and management are facilitated with no detriment to equipment reliability. With all piloting parameters measured electronically, they are easier to control continuously (Continuous Build-In Test) for on-condition maintenance.

Air Liquide’s OBOGS is designed to replace the liquid oxygen reserves on board the aircraft and thereby reduce the weight of the breathing apparatus. A number of factors have combined to reduce the overall mass significantly: unlike some competitors, no plenum is required. At iso performance, the number of molecular sieves is reduced.

Controlling all functions electronically offers great flexibility in managing the operating parameters (altimetric pressure laws, under load factor laws, supervision law, etc.). Operation is possible over a very wide range of feed pressures.

Operating principle

The concentrator increases the oxygen content of the air bled from an engine compressor using a PSA or Pressure Swing Adsorption process. This technology is based on molecular sieves capable of separating the air constituents. Each regulator is built into the ejector seat or fitted to the dashboard and dispenses this oxygen enriched air to the pilot, at a rate that varies with the altitude. It regulates the flow rate and pressure of the gases the pilot needs, both the oxygen-enriched air for breathing and the pressurized air for the anti-G pockets in his trousers. All protective functions that require breathing at safety pressure, altimetric pressure under load factor pressure are controlled by the same regulator.

Key benefits

  • Unparalleled reliability of electromechanical oxygen regulation technology
  • Lightest equipment on the market
  • Increase in the operational availability of aircraft:
    - unlimited cruising time: oxygen is no longer a limiting factor for assignment duration
    - reduced ground operations and logistical support
    - increased flight safety: elimination of fire and explosion hazards in relation to logistics and the use of liquid or high pressure gaseous oxygen

Main technical characteristics

  • Weight of concentrator: < 10 kg
  • Floor space occupied by concentrator ≈ 350 x 350 x 200 mm
  • Minimum pressure: < 5 psig relative to cabin pressure
  • Electricity supply: 28 Vdc or 115 Vac
  • Electrical capacity of complete system < 5 A

References

Aeronautics

Contacts

For any further information, contact us:

Patrick Munoz
Sales - Aeronautics market
Tel: +33 (0) 4 76 43 64 83

Monique Thomachot
Sales - Breathing equipment
Tel: +33 (0) 4 76 43 60 10

North America: Stéphane Lessi
Sales - Newark
Tel: +1 302 286 5524

Nathalie Ray
Sales department
Tel: +33 (0) 4 76 43 62 11

By e-mail :

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