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For a pressurised aircraft, the first-aid oxygen is designed to:

  • A

    provide undiluted oxygen to passengers who might require oxygen following a cabin depressurisation.

  • B

    provide oxygen to passengers who would suffer the effects of low pressure decrease due to long flights at high altitude.

  • C

    protect the flight crew and cabin attendants against fumes and noxious gases.

  • D

    provide oxygen to 10% of passengers at a cabin altitude exceeding 13000 ft after 30 minutes.

Imagine flying in the cruise at FL380 when there is a sudden decompression...

  • Supplemental Oxygen: This is the rubber jungle of masks hanging down. This is provided for the descent to a suitable lower level
  • Therapeutic / First Aid Oxygen: This is for physiological reasons, where some passengers continue to need assistance following the depressurisation and descent. In real life, this oxygen is often used for a wide variety of conditions.

EASA. AIR OPS
Regulation (EU) No 965/2012
CAT.IDE.A.230 First-aid oxygen

(a) Pressurised aeroplanes operated at pressure altitudes above 25 000 ft, in the case of operations for which a cabin crew member is required, shall be equipped with a supply of undiluted oxygen for passengers who, for physiological reasons, might require oxygen following a cabin depressurisation.

(b) The oxygen supply referred to in (a) shall be sufficient for the remainder of the flight after cabin depressurisation when the cabin altitude exceeds 8 000 ft but does not exceed 15 000 ft, for at least 2 % of the passengers carried, but in no case for less than one person.

(c) There shall be a sufficient number of dispensing units, but in no case less than two, with a means for cabin crew to use the supply.

(d) The first-aid oxygen equipment shall be capable of generating a mass flow to each person.

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