93.—(1) An operator of a Singapore registered pressurised aircraft must ensure that the aircraft is equipped with suitable and sufficient apparatus to enable every person on board the aircraft to use the oxygen provided. (2) The apparatus required under paragraph (1) includes —| (a) | automatically deployable oxygen equipment with a quantity of oxygen dispensing units that exceeds the number of seats in the passenger cabin by at least 10%; and | | (b) | an oxygen mask for each flight crew member that supplies oxygen on demand and is readily accessible from that flight crew member’s normal seated position. |
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| (3) Where a Singapore registered pressurised aircraft is to be operated at any altitude above flight level 250, the operator must ensure that every oxygen mask provided to fulfil the requirement in paragraph (2)(b) is a quick donning type. |
(4) Subject to paragraph (6), where a Singapore registered pressurised aircraft is to be operated at any altitude above flight level 100, the operator must ensure that the aircraft carries a supply of oxygen that is the greater of —| (a) | the amount of oxygen calculated in accordance with the operator’s Operations Manual or equivalent document, taking into consideration —| (i) | the possibility of depressurisation when flying above flight level 100; | | (ii) | the possibility of failure of one or more of the aircraft engines; | | (iii) | any restrictions due to required minimum safe altitude; | | (iv) | any fuel requirements; and | | (v) | the performance of the aircraft; or |
| | (b) | the total amount of oxygen prescribed in the following Table 2 for the circumstances that the aircraft is to be operated in. | | Table 2: Oxygen supply for pressurised aircraft |
| | | | | | | | | (1) | When flying above flight level 100 but not exceeding flight level 250 |
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| | (a) | every flight crew member |
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| | 30 minutes or whenever the cabin pressure altitude exceeds 10,000 ft, whichever is the greater. |
| | | | | (b) | every cabin crew member and 10% of the passengers |
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| | (i) | When the aeroplane is capable of descending and continuing to its destination as specified in Capability 1 below, 30 minutes or whenever the cabin pressure altitude exceeds 10,000 ft, whichever is the greater. |
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| | | | | | (ii) | When the aeroplane is not so capable, whenever the cabin pressure altitude is greater than 10,000 ft but does not exceed 12,000 ft. |
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| | | | | (c) | every cabin crew member and all passengers |
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| | When the aeroplane is not capable of descending and continuing to its destination as specified in Capability 1 below, and the cabin pressure altitude exceeds 12,000 ft, the expected continuous duration of time when the cabin pressure altitude exceeds 12,000 ft or 10 minutes whichever is the greater. |
| | | | (2) | When flying above flight level 250 |
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| | (a) | every flight crew member |
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| | 2 hours or whenever the cabin pressure altitude exceeds 10,000 ft, whichever is the greater. |
| | | | | (b) | every cabin crew member |
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| | Whenever the cabin pressure altitude exceeds 10,000 ft and a portable supply for 15 minutes. |
| | | | | | Whenever the cabin pressure altitude exceeds 10,000 ft, but does not exceed 12,000 ft. |
| | | | | | Whenever the cabin pressure altitude exceeds 12,000 ft, but does not exceed 15,000 ft. |
| | | | | | If the cabin pressure altitude exceeds 15,000 ft, the expected continuous duration of time when the cabin pressure altitude exceeds 15,000 ft or 10 minutes, whichever is the greater. |
| | | | | (f) | 2% of the passengers or 2 passengers, whichever is the greater, being the supply of first‑aid oxygen which must be available for simultaneous first‑aid treatment of 2% of the passengers or 2 passengers wherever they are seated in the aeroplane. |
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| | After decompression, whenever cabin pressure altitude exceeds 8,000 ft. |
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(5) In Table 2, “Capability 1” means the situation when a failure to maintain cabin pressurisation occurs and the aircraft is capable of —| (a) | descending to flight level 130 within 4 minutes, in accordance with the emergency descent procedure specified in the aircraft’s flight manual and without flying below the minimum altitudes for safe flight specified in the Operations Manual or equivalent document relating to the aircraft; and | | (b) | continuing at or below that flight level to its intended destination or any other place at which a safe landing can be made. |
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(6) An operator of a Singapore registered pressurised aircraft may, in lieu of complying with paragraph (4), ensure that the aircraft is equipped with a supply of oxygen in accordance with paragraph (7) if the aircraft —| (a) | has a Certificate of Airworthiness that was first issued before 1 January 1989 (whether in Singapore or elsewhere); and | | (b) | is provided with a means of maintaining the pressure in the flight crew compartment, and the compartments in which passengers are carried, at above 700 hPa throughout the flight. |
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(7) The supply of oxygen to be provided for the purposes of paragraph (6) is —| (a) | in every case where the aircraft is to be flown at an altitude above flight level 350, a supply of oxygen in a portable container sufficient for simultaneous first-aid treatment of 2 passengers; and | | (b) | in the event of a failure to maintain a pressure greater than 700 hPa in accordance with paragraph (6)(b) in the circumstances specified in columns 1 and 2 of the following Table 3, a supply of oxygen sufficient for continuous use by the persons specified in column 3 for the period specified in column 4 of the Table. | | Table 3: Alternative oxygen supply |
| | | | | | | | | | Altitude at which aircraft is operating |
| | Capability of aircraft to descend (where relevant) |
| | Persons for whom oxygen is to be provided |
| | Period of supply of oxygen |
| | | | (1) | Above flight level 100 |
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| | | In addition to any passenger for whom oxygen is provided as specified below, all the crew members. |
| | 30 minutes or the period specified at Condition A, whichever is the greater. |
| | | | (2) | Above flight level 100 but not above flight level 300 |
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| | Aircraft is flying at or below flight level 150 |
| | | 30 minutes or the period specified at Condition A, whichever is the greater. |
| | | | Aircraft is capable of descending and continuing to destination as specified at Condition X |
| | | | Aircraft is flying above flight level 150 and is not capable of descending and continuing to destination |
| | | 10 minutes or the period specified at Condition B, whichever is the greater. |
| | | | | 30 minutes or the period specified at Condition C, whichever is the greater. |
| | | | (3) | Above flight level 300 but not above flight level 350 |
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| | Aircraft is capable of descending and continuing to destination as specified at Condition Y |
| | | 30 minutes or the period specified at Condition A, whichever is the greater. |
| | | | Aircraft is not capable of descending and continuing to destination under Condition Y |
| | | 10 minutes or the period specified at Condition B, whichever is the greater. |
| | | | | 30 minutes or the period specified at Condition C, whichever is the greater. |
| | | | (4) | Above flight level 350 |
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| | | | 10 minutes or the period specified at Condition B, whichever is the greater. |
| | | | | 30 minutes or the period specified at Condition C, whichever is the greater. |
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(8) In Table 3 —| “Condition A” means the whole period during which the aircraft flies above flight level 100, after a failure to maintain a pressure greater than 700 hPa in the flight crew compartment and in the compartments in which passengers are carried has occurred; |
| “Condition B” means the whole period during which the aircraft flies above flight level 150, after a failure to maintain a pressure greater than 700 hPa in the flight crew compartment and in the compartments in which passengers are carried has occurred; |
| “Condition C” means the whole period during which the aircraft flies between flight level 100 and flight level 150, after a failure to maintain a pressure greater than 700 hPa in the flight crew compartment and in the compartments in which passengers are carried has occurred; |
“Condition X” means that, at the time when a failure to maintain a pressure greater than 700 hPa in the flight crew compartment and in the compartments in which passengers are carried occurs, the aircraft is capable of —| (a) | descending to flight level 150 within 6 minutes, in accordance with the emergency descent procedure specified in the relevant flight manual and without flying below the minimum altitudes for safe flight specified in the Operations Manual, or equivalent, relating to the aircraft; and | | (b) | continuing at or below that flight level to its place of intended destination or any other place at which a safe landing can be made; |
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“Condition Y” means that, when a failure to maintain a pressure greater than 700 hPa in the flight crew compartment and in the compartments in which passengers are carried occurs, the aircraft is capable of —| (a) | descending to flight level 150 within 4 minutes, in accordance with the emergency descent procedure specified in the relevant flight manual and without flying below the minimum altitudes for safe flight specified in the Operations Manual, or equivalent, relating to the aircraft; and | | (b) | continuing at or below that flight level to its place of intended destination or any other place at which a safe landing can be made. |
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