Regulation 87

the duration of time that is calculated in accordance with the Operations Manual before the commencement of the flight, being the period or periods which it is reasonably anticipated that the aircraft will be flown in the circumstances of the intended flight at an altitude where a supply of oxygen is required, and in calculating that period or those periods of time, the following factors must be taken into account:

the possibility of depressurisation when flying above flight level 100;

the possibility of failure of one or more of the aircraft engines;

the restrictions due to required minimum safe altitude;

the fuel requirements;

the performance of the aircraft;

the duration of time that is calculated in accordance with the following Table 2 for the circumstances that the aircraft is to be operated in: Table 2: Oxygen supply for a pressurised aircraft CircumstancesSupply forDuration (1)When flying above flight level 100 but not exceeding flight level 250(a)All flight crew members30 minutes or for so long as the cabin pressure altitude exceeds 10,000 ft, whichever is the longer. (b)All cabin crew members and 10% of passengers(i)When the aircraft is capable of descending and continuing to its destination as specified in Capability 1, 30 minutes or for so long as the cabin pressure altitude exceeds 10,000 ft, whichever is the longer.(ii) When the aircraft is not capable of descending and continuing to its destination as specified in Capability 1, for so long as the cabin pressure altitude is greater than 10,000 ft but does not exceed 12,000 ft. (c)All cabin crew members and all passengersWhen the aircraft is not capable of descending and continuing to its destination as specified in Capability 1, and the cabin pressure altitude exceeds 12,000 ft, the duration is the period the cabin pressure altitude exceeds 12,000 ft or 10 minutes, whichever is the longer. (2)When flying above flight level 250(a)All flight crew members2 hours or for so long as the cabin pressure altitude exceeds 10,000 ft, whichever is the longer. (b)All cabin crew membersFor so long as the cabin pressure altitude exceeds 10,000 ft and a portable supply for 15 minutes. (c)10% of passengersFor so long as the cabin pressure altitude exceeds 10,000 ft, but does not exceed 12,000 ft. (d)30% of passengersFor so long as the cabin pressure altitude exceeds 12,000 ft, but does not exceed 15,000 ft. (e)All passengersIf the cabin pressure altitude exceeds 15,000 ft, the duration is the period the cabin pressure altitude exceeds 15,000 ft or 10 minutes, whichever is the longer. (f)2% of passengers or 2 passengers, whichever is the greater, being supply of first‑aid oxygen which must be available for simultaneous first‑aid treatment of 2% or 2 passengers, wherever the passengers are seated in the aircraft.For so long as after decompression, cabin pressure altitude exceeds 8,000 ft.

descending to flight level 130 within 4 minutes, in accordance with the emergency descent procedures specified in the relevant flight manual and without flying below the minimum altitudes for safe flight specified for the aircraft in the CGAC holder’s Operations Manual; and

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.

has a Certificate of Airworthiness that was first issued (whether in Singapore or elsewhere) before 1 January 1989; and

is provided with means for maintaining a pressure greater than 700 hPa throughout the flight in the flight crew compartment and in the compartments in which passengers are carried.

in every case where the aircraft is to be flown above flight level 350, a supply of oxygen in a portable container sufficient for the simultaneous first‑aid treatment of 2 passengers; and

in the event of failure to maintain a pressure greater than 700 hPa in accordance with paragraph (3)(b) in the circumstances specified in columns 1 and 2 of the following Table 3, a supply of oxygen sufficient for the continuous use by the persons specified in column 3 for the period specified in column 4 of the Table: Table 3: Alternative oxygen supply Column 1Column 2Column 3Column 4 Aircraft to operate at altitudesCapability of aircraft to descent (where relevant)Person for whom oxygen is to be providedPeriod of supply of oxygen (1)Above flight level 100 All crew members and every passenger for whom oxygen is provided as specified below30 minutes or the period specified at Condition A, whichever is the longer. (2)Above flight level 100 but not above flight level 300(a)Aircraft is either flying at or below flight level 150 or is capable of descending and continuing to destination as specified at Condition X10% of passengers30 minutes or the period specified at Condition A, whichever is the longer. (b)Aircraft is flying above flight level 150 and is not capable of descending and continuing to destination as specified at Condition X(i)All passengers10 minutes or the period specified at Condition B, whichever is the longer. (ii)10% of passengers30 minutes or the period specified at Condition C, whichever is the longer. (3)Above flight level 300 but not above flight level 350(a)Aircraft is capable of descending and continuing to destination as specified at Condition Y15% of passengers30 minutes or the period specified at Condition A, whichever is the longer. (b)Aircraft is not capable of descending and continuing to destination as specified at Condition Y(i)All passengers10 minutes or the period specified at Condition B, whichever is the longer. (ii)15% of passengers30 minutes or the period specified at Condition C, whichever is the longer. (4)Above flight level 350 (i)All passengers10 minutes or the period specified at Condition B, whichever is the longer. (ii)15% of passengers30 minutes or the period specified at Condition C, whichever is the longer.

an on‑demand oxygen mask for each flight crew member, which is a quick‑donning type and readily accessible to a flight crew member from the flight crew member’s normally seated position if the aircraft is to be operated at altitudes above flight level 250; and

automatically deployable oxygen equipment with a quantity of oxygen dispensing units that exceeds the number of seats in the cabin by at least 10%.