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Questions tagged [oxygen]

The 8th chemical element, which is essential for human life. Above a certain altitude, local air pressure is not sufficient for humans to receive enough oxygen to remain fully aware or conscious. Supplemental oxygen is needed if cabin pressure is not sufficient.

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Why is Oiling Pneumatic Air Tools allowed in airplanes? [closed]

If I remember correctly oil in oxygen lines should be avoided due to the possibility of hazardous combustion. However I've seen recently that engineers use oil to lubricate pneumatic air tools. Can ...
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1answer
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Is it possible for crew oxygen to exacerbate a flight deck fire?

Crew oxygen is, as I understand it, a very high percentage of purity. Oxygen-enriched air acts as an accelerant to a fire, causing things to ignite which wouldn't in ordinary air, and making fire ...
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Do pilots get more fresh air than passengers? [duplicate]

There is a famous air travel myth claiming that "pilots get more fresh air than passengers".       (source: The pure cure, p.375) I would like experts to either dispel or confirm this myth, that ...
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592 views

Do pilots breathe the same air as passengers?

Do pilots breathe the same quality of air as passengers ? (i.e. identical parameters: same O2, CO2 and O3 levels, same temperature, same humidity, etc.) Do pilots breath the same air as passengers (...
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How could the Helios 522 passengers have survived so long without oxygen?

I've noticed some strange inconsistencies regarding the documentation of Helios Airways Flight 522. So first: Autopsies on the crash victims showed that all were alive at the time of impact But ...
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What was the first commercial aircraft to have a 'built-in' oxygen system?

(Source) Boeing 307 of TWA, the 307 was the first pressurized passenger aircraft. The 307 (c. 1938) flew as high as 23,300 ft, lower than the jets of nowadays, and did not have a built-in oxygen ...
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Do modern airliners have oxygen sensors in the cabin?

I know that airliners have pressure sensors to check the cabin pressure, and thus check if we can breathe (and get enough O2) inside it so we don't get hypoxia. But that got me thinking: Is there any ...
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Why is it not practical for the USN T-45 to be fitted with oxygen systems used in other trainers?

Back in April, the US Navy (USN) grounded all of its T-45 training flights due to issues with the cockpit oxygen system. I personally heard about this before the grounding secondhand from someone in ...
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Why are oxygen requirements based on pressure altitude?

The FAA's oxygen rules in §91.211 are based on pressure altitude. Assuming our lungs are like our engines and wings and dependent on density altitude, why are the oxygen requirements not based on ...
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1answer
943 views

Are Cargo Holds Pressurized, Non-pressurized, or vacuumed? [duplicate]

I watched an episode of Air Crash Investigation, which depicts a plane catching fire due to it shipping many expired oxygen generators for planes. The narrator says that a fire in the cargo hold is ...
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1answer
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How often are passenger oxygen masks deployed?

In commercial passenger aviation, how frequent (or infrequent) is the case that oxygen masks deploy? Please include links to statistics.
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Does oxygen become less available during night-time?

The following excerpt is from the FAA's Pilot's Handbook of Aeronautical Knowledge (page 7-37): Some people flying above 10,000 feet during the day may experience disorientation due to the lack ...
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1answer
807 views

Is there possibility to Survive without brain damage at 30/35,000 feet?

I just read Mayday by Nelson Demille. I won't get into many details but the book talks about an airliner (similar to the Concorde) which operates at an altitude of ~60,000 ft (~18Km). Suddenly, due to ...
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Does hypoxia affect pilots differently from people on the ground?

In my experience, many people don't have serious problems camping, skiing, hiking or doing other physical activities at 12,000 feet (3,600m). We may get tired easily, and be out of breath, but we ...
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How do people suffering from hypoxia not realize they aren't getting enough oxygen?

I've seen reports of flight passengers/crew suffering hypoxia, and many times without knowing it. My question is, how could you not be aware of it? For example, at above 10000ft, if your body is ...
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1answer
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Passenger hypoxia in a small plane at 11,000 feet: what is the pilot's responsibility?

An acquaintance of mine visiting western U.S. was recently a guest passenger in a small plane flying from Santa Fe, New Mexico to Colorado reaching an altitude of 11,000 feet. She related that she ...
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1answer
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How do the oxygen masks deploy after a cabin decompression?

Is there any sensor incorporated on the Passenger Service Unit that tells the masks to deploy when a cabin decompression occurs?
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1answer
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Where does the oxygen come from in the deployable breathing masks? [duplicate]

I don't know what they are called. In case of emergency like smoke they deploy, but where do this oxygen come from.
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Is flying at 14,000 MSL safe for children without supplemental oxygen?

FAR 91.211(a) requires supplemental oxygen for all passengers above 15,000 feet. Are there any health implications of a 5 hour flight at around 14,000 feet on children without any supplemental oxygen?...
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What are the advantages of Chemical Oxygen Generation over Gaseous Canisters on board of aircrafts?

I'm looking to get a bit of info on Chemical Oxygen generation, especially as done on aircraft. I understand the process of Chemical Oxygen Generation. I'm also aware that weight for weight it ...
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How does air enter and leave the cabin of an airliner? [duplicate]

Yesterday I flew on Airbus A320 and on the airline's board catalogue, there were written some "curiosities". On was written that the air coming from the air conditioning inside the fuselage is very ...
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What equipment qualifies as FAA-acceptable for providing “Supplemental Oxygen”?

FAR 91.211 tells us when supplemental oxygen is required, but it's not very specific as to how that oxygen is to be provided. FAR 23.1447 gives some information about installed systems, but I can't ...
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How long will one remain conscious in the event of a sudden cabin depressurization?

I know the usual scenario is where an airliner suffers from an explosive decompression and the oxygen masks drop and the plane descends to a safer altitude but..... This is a purely hypothetical ...