AIR847A has been reaffirmed to comply with the SAE five-year review policy.

The recommendations embodied in this document are applicable to commercial transport aircraft for operations between 8,000 and 40,000 ft. altitude. The A-10 Committee concluded that the content of this document will not be updated in the future. New documents updating the issues previously addressed have been or are being developed that addresses current technologies and practices specific to commercial operations above 40,000 ft. Therefore, the Committee decided to stabilize this document in its current state.

This report is intended to acquaint personnel involved in the design, inspection, and maintenance of civil transport oxygen systems with the human respiratory requirements and oxygen system design considerations necessary to effect an interface and provide acceptable high-altitude life support. Simplified explanations and language that should be understandable by lay and semiprofessional engineering personnel are used, with references to sources of more detailed information. The oxygen system designer is directed to applicable Federal Aviation Regulations pertaining to oxygen systems and, where regulatory guidance does not exist, directs the reader to applicable oxygen equipment industry practices, standards, and information reports. (Author).

This specification covers the types of oxygen masks considered satisfactory for use in commercial transport aircraft at altitudes up to 25,000 ft. The types of masks covered are: