This standard is intended to apply to portable compressed gaseous oxygen equipment. When properly configured, this equipment is used either for the administration of supplemental oxygen, first aid oxygen or smoke protection to one or more occupants of either private or commercial transport aircraft. This standard is applicable to the following types of portable oxygen equipment:

1. a Continuous flow
   1. 1 Pre-set
   2. 2 Adjustable
   3. 3 Automatic
2. b Demand flow
   1. 1 Straight-demand
   2. 2 Diluter-demand
   3. 3 Pressure-demand
3. c Combination continuous flow and demand flow.