Date: 10 Feb 2000 05:03:27 From: firstname.lastname@example.org Organization: NETCOM / MindSpring Enterprises, Inc. References: 1 2
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In article <airliners.2000.12@ohare.Chicago.COM>, GLPILOTSRV <email@example.com> wrote: >This is the reason that above 25,000 feet, if one crew member leaves the >flight deck, the remaining crew member is required to use supplemental >oxygen. Above 35,000 feet, regardless of number of crew members on the >flight deck, one crew member must utilize supplemental oxygen. Not exactly. http://www.faa.gov/avr/AFS/FARS/far-121.txt (2) When operating at flight altitudes above flight level 250, one pilot at the controls of the airplane shall at all times wear and use an oxygen mask secured, sealed, and supplying oxygen, in accordance with the following: (i) The one pilot need not wear and use an oxygen mask at or below the following flight levels if each flight crewmember on flight deck duty has a quick-donning type of oxygen mask that the certificate holder has shown can be placed on the face from its ready position, properly secured, sealed, and supplying oxygen upon demand, with one hand and within five seconds: (A) For airplanes having a passenger seat configuration of more than 30 seats, excluding any required crewmember seat, or a payload capacity of more than 7,500 pounds, at or below flight level 410. (B) For airplanes having a passenger seat configuration of less than 31 seats, excluding any required crewmember seat, and a payload capacity of 7,500 pounds or less, at or below flight level 350. And: http://www.faa.gov/avr/AFS/FARS/far-91.txt Sec. 91.211 Supplemental oxygen. (a) General. No person may operate a civil aircraft of U.S. registry-- (b) Pressurized cabin aircraft. (1) No person may operate a civil aircraft of U.S. registry with a pressurized cabin-- (ii) At flight altitudes above flight level 350 unless one pilot at the controls of the airplane is wearing and using an oxygen mask that is secured and sealed and that either supplies oxygen at all times or automatically supplies oxygen whenever the cabin pressure altitude of the airplane exceeds 14,000 feet (MSL), except that the one pilot need not wear and use an oxygen mask while at or below flight level 410 if there are two pilots at the controls and each pilot has a quick-donning type of oxygen mask that can be placed on the face with one hand from the ready position within 5 seconds, supplying oxygen and properly secured and sealed. (2) Notwithstanding paragraph (b)(1)(ii) of this section, if for any reason at any time it is necessary for one pilot to leave the controls of the aircraft when operating at flight altitudes above flight level 350, the remaining pilot at the controls shall put on and use an oxygen mask until the other pilot has returned to that crewmember's station. To wit: 1. Don't need to wear oxygen under FL410 if you have quick-donning masks. 2. If anyone leaves the cockpit above FL350, a remaining pilot needs to go on oxygen. Full text at the URLs. Yes, the rules are real, and yes, crews tend to obey them. So when you note the captain stretching his legs halfway through a flight, feel confident that the first officer is on oxygen. -- Robert Dorsett Moderator, sci.aeronautics.simulation firstname.lastname@example.org email@example.com "Bother," said Pooh when his engine quit on take-off.