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This standard covers both general type and quick-donning type mask assemblies in the following classes: a Class A, oronasal, demand b Class B, oronasal, pressure-demand c Class C, full face, demand d Class D, full face, pressure-demand

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:

This standard covers both general type and quick-donning type mask assemblies in the following classes: a Class A, oronasal, demand b Class B, oronasal, pressure-demand c Class C, full face, demand d Class D, full face, pressure-demand

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.

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.