(1) No person may operate a civil aircraft of U.S. (3) At cabin pressure altitudes above 15,000 feet (MSL) unless each occupant of the aircraft is provided with supplemental oxygen. (2) At cabin pressure altitudes above 14,000 feet (MSL) unless the required minimum flight crew is provided with and uses supplemental oxygen during the entire flight time at those altitudes and (1) At cabin pressure altitudes above 12,500 feet (MSL) up to and including 14,000 feet (MSL) unless the required minimum flight crew is provided with and uses supplemental oxygen for that part of the flight at those altitudes that is of more than 30 minutes duration No person may operate a civil aircraft of U.S. As far as who has to wear what and when, I'll let you read it for yourself. "As far as the various O2 regulations go, the US FARs apply to any civilian US registered aircraft be it turbojet, turboprop, or piston-powered, single or multi-engine. The last paragraph (#4), specifically answers your question and is from this discussion link. according to the info below that was posted by Jetguy on Nov 18, 2003. > Matt72033, yes that's true for USA registered aircraft if the aircraft is operating at altitudes above 25,000 feet MSL. Is it not true that whenever one pilot leaves the flight deck the other must wear his/her oxygen mask until the other pilot returns? This Helios crash will be one of those much talked about ones, like Egyptair 767 or Sioux City. It's not like it has been solved, but I will speculate the cause of that one will not be too strange. The AF358 crash did not have this many mysteries. Did pax oxygen run out? I hear there's only about 10-15 minutes of oxygen in the system. This could well be more than the fuel reserves. What made the plane start descending? Was it the pilots or lack of fuel? According to, normally a reliable source, the plane flew for at least an hour from the time it entered Greek airspace (where ATC did not manage to contact the plane) until it crashed. Also, if he was blue in the face but could still stand, why didn't he take the controls? If one of the pilots was in the cabin (as the text message seems to indicate), why was this? ![]() If the pilots had managed to don their masks, why were they overcome? Contaminated oxygen? Of course, we can't know if anything we hear is true at this point, but here's what I noticed. One thing I have already noticed about this crash is the large number of question marks. If I learn anything I will pontificate as usual. My personal favorite "lower altitude" is field elevation of the nearest suitable airport but you know what a cautious guy I am. If the masks drop out, it is probably the best duty of the pilots to don their own masks and get the plane safely to a lower altitude. The report of only one pilot on the flight deck, if true is very puzzling. I have flown the 737 but at this moment my ignorance on this crash is total.
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