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  • Q 710591

    For a pressurized aircraft, flying at FL240 with 150 passengers on board, the regulatory oxygen requirements are:

    1. Each flight crew member shall be supplied with a quick donning oxygen mask.
    2. The aircraft will be equipped with a warning system indicating that the cabin altitude is higher than 3 000m.
    3. The quantity of oxygen on board shall be sufficient for the supply of 100% of the occupants during the whole flight time at cabin pressure altitude above 15 000 ft (not less than 10 minutes).
    4. The first aid quantity of oxygen shall be sufficient for the supply of three passengers during the whole flight time when the cabin altitude is greater than 8 000 feet.

    The combination regrouping all the correct statements is:

    Correct answer is given as 2,3.

    However, the question clearly states "100% of the occupants" (option 3), whereas the oxygen requirement above 15,000ft only applies specifically to passengers, so not to "100% of occupants on board".

    The question uses the word 'passengers' in statement 4, so the question writer was clearly distinguishing between occupants and passengers.

    So I'd go with only 2, which is marked as wrong. Can somebody clear this up?

    Cheers!

  • #2
    Yes, I will clear this up. This as old QB question, and actually it is wrong. I will change ITEM 3 to say 100% of the passengers. The correct answer will be for is for ITEM 3 only (I will change the QB,
    but it will take a few days to show).. The details are:


    For a pressurized aircraft, operating at FL240 with 150 passengers on board .... looking at each item in turn, we need to go
    to 2 EASA OPS references:

    1. Each flight crew member shall be supplied with a quick donning oxygen mask - NO

    CAT.IDE.A.235 Supplemental oxygen - pressurised aeroplanes

    (b) Pressurised aeroplanes operated at pressure altitudes above 25 000 ft shall be equipped with:
    (1) quick donning types of masks for flight crew members;

    (2) sufficient spare outlets and masks or portable oxygen units with masks distributed evenly
    throughout the passenger compartment, to ensure immediate availability of oxygen for use
    by each required cabin crew member;
    (3) an oxygen dispensing unit connected to oxygen supply terminals immediately available to

    each cabin crew member, additional crew member and occupants of passenger seats,
    wherever seated; and
    (4) a device to provide a warning indication to the flight crew of any loss of pressurisation.



    2. The aircraft will be equipped with a warning system indicating that the cabin altitude is higher than 3 000m. - NO

    See (b)(4) above (ICAO Annex 6 is the same) - Pressurised aeroplanes operated at pressure altitudes above 25 000 ft shall
    be equipped with:
    (4) a device to provide a warning indication to the flight crew of any loss of pressurisation.


    3. The quantity of oxygen on board shall be sufficient for the supply of 100% of the passengers during the whole
    flight time at cabin pressure altitude above 15 000 ft (not less than 10 minutes). - YES


    CAT.IDE.A.235 Supplemental oxygen - pressurised aeroplanes
    Table 1 Oxygen minimum requirements for pressurised aeroplanes

    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.

    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.

    3. 100 % of passengers
    The entire flying time when the cabin pressure altitude exceeds 15 000 ft,
    but
    in no case less than 10 minutes



    4. The first aid quantity of oxygen shall be sufficient for the supply of three passengers during the whole flight time when the cabin altitude is greater than 8 000 feet. - NO

    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 calculated using an average flow rate of at least 3
    litres standard temperature pressure dry (STPD)/minute/person. This oxygen supply shall be
    sufficient for the remainder of the flight after cabin depressurisation when the cabin altitude
    exceeds 8000 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 user of at least
    4 litres STPD per minute.
    Last edited by Tom; 07-08-2019, 13:46.

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    • #3
      Many thanks for your detailed reply Tom!

      Comment

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