Text in force at 25-153: from 25-0, effective 1 Feb 1965.
(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.
29 FR 18291 · Source