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In accordance with OPS regulations, for a pressurised aeroplane, the minimum requirement for supplemental oxygen needed to supply 100% of the passengers following a cabin pressurisation failure, is:
  • A
    the entire flight time after 30 minutes at pressure altitude greater than 10000 ft but not exceeding 13000ft.
  • B
    the entire flight time where the cabin pressure altitude exceeds 15000 ft, but in no case less than 10 minutes.
  • C
    the entire flight time when the cabin pressure altitude exceeds 13000 ft.
  • D
    30 minutes.

EASA AIR OPS
Regulation (EU) No 965/2012
CAT.IDE.A.235 Supplemental oxygen – pressurised aeroplanes

(a) Pressurised aeroplanes operated at pressure altitudes above 10 000 ft shall be equipped with supplemental oxygen equipment that is capable of storing and dispensing the oxygen supplies in accordance with Table 1

Table 1
Oxygen minimum requirements for pressurised aeroplanes

Supply for Duration and cabin pressure altitude
1. Occupants of flight crew compartment seats on flight crew compartment duty (a) The entire flying time when the cabin pressure altitude exceeds 13 000 ft.
(b) The remainder of the flying time when the cabin pressure altitude exceeds
10 000 ft but does not exceed 13 000 ft, after the initial 30 minutes at these
altitudes, but in no case less than:
(1) 30 minutes’ supply for aeroplanes certified to fly at altitudes not
exceeding 25 000 ft; and
(2) 2 hours’ supply for aeroplanes certified to fly at altitudes of more
than 25 000 ft.
2. Required cabin crew members (a) The entire flying time when the cabin pressure altitude exceeds 13 000 ft,
but not less than 30 minutes’ supply.
(b) The remainder of the flying time when the cabin pressure altitude exceeds
10 000 ft but does not exceed 13 000 ft, after the initial 30 minutes at these
altitudes.
3. 100 % of passengers(1) The entire flying time when the cabin pressure altitude exceeds 15 000 ft, but in no case less than 10 minutes’ supply.
4. 30 % of passengers(1) The entire flying time when the cabin pressure altitude exceeds 14 000 ft but
does not exceed 15 000 ft.
5. 10 % of passengers(1) The remainder of the flying time when the cabin pressure altitude exceeds
10 000 ft but does not exceed 14 000 ft, after the initial 30 minutes at these
altitudes.
(1) Passenger numbers in Table 1 refer to passengers actually carried on board, including persons younger
than 24 months.

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