§25.1441 Oxygen equipment and supply

(a) If certification with supplemental oxygen equipment is requested, the equipment must meet the requirements of this paragraph and CS 25.1443 through 25.1453. (b) The oxygen system must be free from hazards in itself, in its method of operation, and in its effect upon other components. (See AMC 25.1441(b)) (c) Except for oxygen chemical generators and for small sealed, one-time use, gaseous oxygen bottles, there must be a means to allow the crew to readily determine, during flight, the quantity of oxygen available in each source of supply. (d) The oxygen flow rate and the oxygen equipment for aeroplanes for which certification for operation above 12192 m (40 000 ft) is requested must be approved. (See AMC 25.1441(d).)