What are the normal oxygen delivery systems onboard a passenger aircraft?

Passenger Compartment In non-pressurised aircraft which routinely fly above 10,000', passenger oxygen is typically provided by either a fixed or a portable system. Fixed systems draw their oxygen supply from a pressurised cylinder of gaseous oxygen.



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There are three standard types of aviation oxygen systems:
  • Continuous flow: For aircraft that fly under 25,000 feet or utilize a portable oxygen supply.
  • Diluter demand: Meant for flight between 25,000 and 40,000 feet high.
  • Pressure demand: Systems for aviation at over 40,000 feet.


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AIRCRAFT EMERGENCY OXYGEN SYSTEM: In the event of an emergency, the plane is already equipped with oxygen systems which are linked to passengers and cabin crew through masks. In fact, there are two oxygen systems on board. One designed for the crew, and the second for the passengers.

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The Systems - Continuous Flow, Diluter Demand and Pressure Demand. There are three main types of oxygen systems to keep you safe - and all are meant for different altitudes. If you're carrying portable oxygen on-board, or your airplane's limited to 25,000 feet, you'll most likely have a continuous-flow oxygen system.

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Airlines are not required to provide oxygen service and many do not. Passengers may carry portable oxygen concentrators (POCs).

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If the cabin altitude reaches a predetermined height (14,000' is standard), or if the system is activated by the flight crew, overhead panels open and oxygen masks drop out. To put the mask on, it is necessary for the intending user to pull it down and this action releases the firing pin and activates the generator.

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