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OBIGGS for aircraft

OBIGGS for helicopter

Protection of the helicopter fuel tanks against any risk of fire or explosion

Protect the helicopter tanks against explosion

The OBIGGS is a simple equipment generating directly Nitrogen on board to fully protect the helicopter tanks against explosion, and improve crew members safety. Autonomous, it does not require any logistics.


Based on a hollow fiber separation process, the OBIGGS allows to produce during the mission the flow of Nitrogen Enriched Air (NEA) requested to protect the helicopter. Part of the oxygen contained in the fuel tank is replaced by Nitrogen, keeping the vapours non-flammable.

The OBIGGS includes a Temperature Control System, a filter, a pressure controller, an oxygen sensor and a separation module. Hence, compressed air is directly tapped on Helicopter engine air and transformed into NEA that can be directly distributed in the fuel tanks. Compact, the Air Liquide OBIGGS can be easily installed on the Helicopter. Besides, Air Liquide can support the customer to design the distribution system: Inerting modelling, piping sizing, supply of distribution components. The use of the OBIGGS does not need any calibration or logistic operation before the flight. By means of the control of a selected set of signals generated by the OBIGGS, the crew is permanently aware of the status of the equipment.


  Light helicopter Large helicopter
Weight < 4.5 kg < 12 kg
Flow 0.15 lb/min 0.4 lb/min
NEA quality up to 4 % O2 up to 7 % O2
Power supply 28 Vdc - 115 Vac  / 400 Hz 28 Vdc - 115 Vac / 400 Hz


Key benefits

  • Compact lightweight system: Simple integration
  • No calibration nor logistic
  • Reduced schedule maintenance
  • Full Air Liquide support for OBIGGS integration and gas distribution design

Key technical characteristics

Separation by MEDAL hollow fibers membrane

Temperature Management System (TMS) allowing to use bleed air with temperatures up to 400°C

Integrated controller including a pressure regulator, a shut-off valve, a flow regulator and an oxygen analyser

Control signals to be aware permanently of the operational status of the equipment


Qualified according to MIL-STD standards


  • Eurocopter TIGER attack helicopter (UHT version)
  • Helicopter ALH designed by Hindustan Aeronauticis Ltd
  • Korean Aerospace Industry KUH

Discover also:

analyser in obogs

Oxygen analyzer

As part of an OBIGGS, the oxygen analyzer ensures that the system is in good working order. It analyzes the oxygen-depleted gas and sends an electrical signal reflecting the quantity of oxygen as a percentage or in partial pressure. The O2 analyzer is fitted with a zirconium oxide sensor to ensure its precision and reliability. It can operate at a wide range of pressures, from a few millibars to several bars and temperatures of up to 300°C.