This slash document collects general reference material related to gaseous oxygen system flow requirements and sizing calculations. This document will assist oxygen system equipment designers and operators to establish systems and equipment requirements. The document consists of charts, tables, system schematics, system requirements, and sample calculations for system sizing. AIR825/14 has been reaffirmed to comply with the SAE five-year review policy.

This report provides information on the design and use of aircraft oxygen systems. It explains the physiological oxygen requirements of the human body in both a normal environment and in an hypoxic environment.It includes an overview of the continuous flow, demand and pressure demand, and liquid oxygen systems. A basic understanding of how each system operates is then specifically addressed in its own titled section.The charts, tables, and schematics provide a specific example of a theoretical oxygen system design and the calculations showing how that system would meet the regulations established by the FAR's. A comprehensive overview of the theoretical oxygen requirements of the human body at altitude is also provided.A detailed list of specifications and standards applicable to aircraft oxygen systems is included. AIR825C is a comprehensive document covering general information on the various types of oxygen equipment and oxygen systems used on aircraft including basic system design information. These requirements and more are covered in greater individual detail by other SAE documents in an AIR825/1 through AIR825/14 document series.

Aircraft components, Breathing apparatus, Oxygen, Oxygen masks, Air transport engineering, Design, Installation, Gas circuits, Service pressure, Working range, Air safety, Safety measures, Equipment safety, Compatibility, Chemical-resistant materials, Pipe couplings, Pipe connections, Pipework systems, Filters, Pressure regulators, Valves, Joints, Pressure control, Maintenance, Climatic hazards, Ice, Moisture, Control switches, Control knobs, Strength of materials, Mechanical properties of materials, Welded joints, Soldered joints, Brazed joints, Cleaning, Identification methods, Marking

A self-contained aircraft oxygen system (SCAOS) was developed. It consists of a concentrator to extract oxygen from engine bleed air, a scrubber to remove exhaled CO2, and valves, compressor, regulators, accumulator, emergency oxygen supply, sensors, and mechanical and electrical controls. The SCAOS operates on a closed-loop, rebreather cycle with the capability of providing short-term open loop operation. The system is designed to supply oxygen to two men at cabin altitudes from sea level to 43,000 feet. System development included design analyses, studies of aircraft bleed and cooling air interfaces with emphasis on the F-4 aircraft, development of component specifications, system ground testing, flight testing in a T-39 aircraft with human test subjects, and modifications resulting from system test experience. (Modified author abstract).

This Aerospace Information Report (AIR) defines words, terms, and specialized language used in describing the function, design, and operation of aircraft oxygen systems.