Explain the operation of liquid oxygen generator system in aircraft.?
There are 2 O2 systems on a commercial aircraft. The pilots are fed from a bottle generally located in or around the forward cargo pit. It is a pressurized cylinder filled with O2 in gas form, not liquid.
The second system are a series of chemical oxygen generators places in the passenger service units (PSUs) above each seat. These are not liquid, either. They are two chemicals in solid form that, when introduced to one another, heat up and the resultant reaction is the creation of oxygen molecules.
So, I don’t know of any modern airlines that carries liquid O2. It is heavy, first of all, and more dangerous to handle than the two forms presently used in commercial aviation.
There is no liquid oxygen generator on an aircraft. Aircraft contain tanks with oxygen in them, they do not produce their own liquid oxygen, that is a very very labor intensive and expensive procedure. Naval Aircraft carry lox bottles (liquid oxygen bottles), the bottles are filled at the liquid oxygen plant on the Carrier which is powered by the Nuclear Reactor…..
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The oxygen generated canister started with B737 series found in PSU (passenger service unit) and now everybody uses including Airbus. When the mask drops out from the PSU compartment (in case of decompression) pulling the lanyard will pull a plunger and the action will like a gun trigger, hit the firing pin opening the canister for oxygen to flow.
This canister type is solely for passenger use while the crew still has the bottled oxygen usually found at the fwd cargo compartment.
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It doesn’t generate liquid oxygen on the aircraft. It’s just a pressure tank with a "pop valve" that releases the contents when needed. The liquid oxygen becomes gasseous when the pressure is released, and feeds to the cabin oxygen masks. It’s a goofy system introduced to save weight and a little space.
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old pilot
I think you’re talking about the oxygen generators for the emergency masks that come out of the ceiling of airlines.
Oxygen tanks for the crew are usually pressurized gaseous oxygen.
Usually there’s an exothermic chemical reaction that produces pure oxygen when activated. I don’t know what the chemicals are but if you think like the opposite of a fire (a fire that consuming oxygen and producing CO2) that’s basically how it works. So it consumes some other chemical and produces oxygen.
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pilot
There are 2 O2 systems on a commercial aircraft. The pilots are fed from a bottle generally located in or around the forward cargo pit. It is a pressurized cylinder filled with O2 in gas form, not liquid.
The second system are a series of chemical oxygen generators places in the passenger service units (PSUs) above each seat. These are not liquid, either. They are two chemicals in solid form that, when introduced to one another, heat up and the resultant reaction is the creation of oxygen molecules.
So, I don’t know of any modern airlines that carries liquid O2. It is heavy, first of all, and more dangerous to handle than the two forms presently used in commercial aviation.
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It’s a chemical reaction canister to provide oxygen for passengers should a decompression occur, it only lasts about 10 minutes which is plenty of time for the pilot to descend to an altitude where oxygen isn’t required.
These canisters were famous for starting the fire in the cargo hold of a Valu Jet DC-9 that crashed in the Florida Everglades some years ago. They were being shipped to another location for re-certification but were improperly packaged. They were jostled during the taxi/takeoff portion of the flight that caused a chain reaction of canisters, which get very, very hot when activated, resulting in a fire that also ignited a spare tire that was being carried for the plane in the cargo hold.
The aircraft nose-dived into the Everglades killing all on board and a large portion of the plane, along with many victims were never recovered since it was buried so deep.
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