25.1445—Equipment standards for the oxygen distributing system.
(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.