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

The on-board oxygen generation system or OBOGS is designed to satisfy the breathing needs of the whole crew and to protect them against NBC attacks. On a military cargo aircraft, this system must be available for use on demand as a function of the assignment. Air Liquide’s OBOGS simulates crew consumption on an ongoing basis, thereby allowing the equipment to be made immediately operational in case of need.

This equipment has built-in new generation electronics, a very elaborate self-diagnosis system and an outflow control valve, a valve for continuous control of equipment performance and for automatically selecting the oxygen supply mode, namely cylinders or OBOGS.

With oxygen regulation based on electromechanical technology, the gas is dispensed faster and more accurately that by equipment of purely mechanical design.
System diagnosis and management are also facilitated with no detriment to reliability. With all piloting parameters measured electronically, they are easier to control continuously (CBIT) 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 its overall mass significantly: unlike some competitors, no plenum is required. At iso performance, the number of molecular sieves is reduced.

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