Supplemental oxygen requirements can be confusing ..... we need to distinguish between Pressurised and Non-pressurized aeroplanes

Non-pressurised ....

Flight crew - entire flight time at pressure altitudes above 10 000ft

Cabin crew - Entire flight time at pressure altitudes above 13 000 ft and for any period exceeding 30 minutes at pressure altitudes above 10 000 ft but not exceeding 13 000 ft.

Pressurised ...

Flight crew .... Entire flight time when the cabin pressure altitude exceeds 13 000 ft and entire flight time when the cabin pressure altitude exceeds 10 000 ft but does not exceed 13 000 ft after the first 30 minutes at those altitudes, but in no case less than:


(i) 30 minutes for aeroplanes certificated to fly at altitudes not exceeding
25 000 ft
(ii) two hours for aeroplanes certificated to fly at altitudes more than
25 000 ft

Cabin crew Entire flight time when cabin pressure altitude exceeds 13 000 ft but not less than 30 minutes, and entire flight time when cabin pressure altitude is greater than 10 000 ft but does not exceed 13 000 ft after the first 30 minutes at these altitudes