Liquid oxygen system1/17/2024 ![]() However, these regulations may be more or less restrictive than the SARPS. Note 2: National or Regional Authorities use the ICAO guidance as the basis for their regulations. All flight crew members of pressurised aeroplanes operating above an altitude where the atmospheric pressure is less than 376 hPa shall have available at the flight duty station a quick-donning type of oxygen mask which will readily supply oxygen upon demand.The total number of oxygen dispensing units shall exceed the number of passenger and cabin crew seats by at least 10 per cent. shall be provided with automatically deployable oxygen equipment. An aeroplane intended to be operated at flight altitudes at which the atmospheric pressure is less than 376 hPa or which, if operated at flight altitudes at which the atmospheric pressure is more than 376 hPa, cannot descend safely within four minutes to a flight altitude at which the atmospheric pressure is equal to 620 hPa.A flight to be operated at flight altitudes at which the atmospheric pressure in personnel compartments will be less than 700 hPa shall not be commenced unless sufficient stored breathing oxygen is carried to supply: a) all crew members and 10 per cent of the passengers for any period in excess of 30 minutes that the pressure in compartments occupied by them will be between 700 hPa and 620 hPa and b) the crew and passengers for any period that the atmospheric pressure in compartments occupied by them will be less than 620 hPa.An aeroplane intended to be operated at flight altitudes at which the atmospheric pressure is less than 700 hPa (see Note 1) in personnel compartments shall be equipped with oxygen storage and dispensing apparatus.d) oxygen dispensing equipment, if the provision of oxygen for the use of passengers is prescribed. An operator shall ensure that passengers are made familiar with the location and use of.Some of the more salient items found in the ICAO guidance on oxygen are as follows: In general terms, this guidance first differentiates between pressurised and non-pressurised aircraft and then provides specific requirements based on the altitude at which flight is to be conducted. National regulations for the provision and use of supplemental or emergency oxygen systems are based on the guidance provided in Annex 6 of the International Civil Aviation Organisation (ICAO) Standards and Recommended Practices (SARPS). ![]() Depending upon the type and the role of the aircraft concerned, the oxygen system(s) may be used for normal operations, to provide supplemental oxygen for specific situations or for provision of emergency oxygen in the event of smoke, fire, fumes or loss of pressurisation. Oxygen systems are installed in many military aircraft and in most commercial and business aircraft types. Oxygen systems are designed to store or to generate a supply of pure oxygen and to regulate, dilute as required and then distribute that oxygen to crew or passengers. This article describes the systems onboard commercial transport aircraft designed to supply supplemental oxygen to crew and passengers when required to sustain life. Editor's note: These figures compare with similar tables claiming the USAF as a source - if any member of the SKYbrary community can provide a more authoritative reference, please contact the editor Description This process is experimental and the keywords may be updated as the learning algorithm improves.Source: Cabin Decompression and Hypoxia by Mark Wolff, PIA Air Safety Publication, 2006. These keywords were added by machine and not by the authors. This fact enables large quantities of breathing oxygen to be stored in liquid form in containers designed to withstand only moderate internal pressure as opposed to a great number of containers holding gas at moderate pressure or a few extremely heavy containers holding gas at high pressure. The space and weight reductions are possible because of the fact that a given volume of liquid oxygen under moderate pressure can be converted to over 800 volumes of oxygen gas suitable for breathing. In general, the use of a liquid oxygen system instead of the standard gaseous oxygen system makes possible a weight reduction of 65 percent and a space reduction for the system of 85 percent. ![]() ![]() Equipment for the utilization of liquid oxygen in aircraft as a source of breathing oxygen for pilots and crewmen at high altitudes is now standard with the Air Force, This equipment has for some time been installed in production run aircraft of certain types because of weight and space savings possible with the liquid oxygen equipment as opposed to the standard gaseous oxygen system. ![]()
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