This standard covers oxygen masks and breathing valves used with both panel mounted and mask mounted demand and pressure-demand oxygen regulators. Mask mounted oxygen regulators are covered under other standards, but when the mask mounted regulator incorporates an integral exhalation valve, the performance of this valve shall meet the requirements of this standard.
Various aspects of the existing document have become dated. Among these are content related to flammability, material choices, and cleaning methods. This document serves as the Minimum Performance Standard for TSO/ETSO C78 and recent revisions to this TSO/ETSO have taken exception to several aspects of this document's content. The revision will update the content of the Standard to reflect state-of-the-art current practices.