OBIGGS for ALH [ Return towards  Helicopters  ]

Air Liquide has been able to provide a perfect match for the constraints of the ALH helicopter specification offering a comprehensive and compact system. The inert gas (nitrogen) is generated using a polymer membrane for air separation. This technology, developed by the Air Liquide Group for industrial applications, has been adapted to the restrictive aeronautics environment, and has been fitted to planes and helicopters for close on 20 years.

Apart from the inert gas generation itself, Air Liquide has incorporated in the same equipment a temperature control system to ensure nominal operation both in extremely cold mountain-top temperatures and in hot desert areas. Air Liquide’s experience in the inerting field has also been of use in optimizing the supply of inert gas to the ALH tanks, supporting the plane maker in designing the feeder lines, modeling nitrogen dispersion in the fuel tanks and supplying related fuel system components (clack valves, gauged orifices, etc.).

A comprehensive provision
Far from confining itself just to air separation, Air Liquide is responsible for the whole nitrogen production line, from conditioning air from the "bleed" circuit to supplying gas to the tanks. Air Liquide is thus able to provide optimum inerting, perfectly adapted to the plane. 

Continuous monitoring
In the event of a malfunction upstream or in the core of the inerting system, the system is able not only to feed the information back to the pilot, but also to protect itself, thereby cutting down on maintenance and operating costs for the user. 

Support from design stage to qualification
Air Liquide is in a position to provide a total "inerting" service. Support during the system design phase, help with integration on the aircraft, use of nitrogen in the fuel tanks