14 C.F.R. § 25.1445 Equipment standards for the oxygen distributing system.
Title 14 - Aeronautics and Space
(a) When oxygen is supplied to both crew and passengers, the distribution system must be designed for either— (1) A source of supply for the flight crew on duty and a separate source for the passengers and other crewmembers; or (2) A common source of supply with means to separately reserve the minimum supply required by the flight crew on duty. (b) Portable walk-around oxygen units of the continuous flow, diluter-demand, and straight demand kinds may be used to meet the crew or passenger breathing requirements.
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart F—Equipment
Miscellaneous Equipment
§ 25.1445 Equipment standards for the oxygen distributing system.
