AMC1 CAT.IDE.A.235(e) Supplemental
oxygen – pressurised aeroplanes
AEROPLANES NOT CERTIFIED TO FLY ABOVE 25 000 ft
(a) With respect to CAT.IDE.A.235(e), the maximum altitude up to which an aeroplane can operate without a passenger oxygen system being installed and capable of providing oxygen to each cabin occupant, should be established using an emergency descent profile that takes into account the following conditions:
(1) 17 seconds’ time delay for pilot’s recognition and reaction, including mask donning, for trouble shooting and configuring the aeroplane for the emergency descent (emergency descent data/charts established by the aeroplane manufacturer and published in the aircraft flight manual (AFM), and/or the AFM should be used to ensure uniform application of the option); and
(2) maximum operational speed (VMO) or the airspeed approved in the AFM for emergency descent, (emergency descent data/charts established by the aeroplane manufacturer and published in the AFM, and/or AFM should be used to ensure uniform application of the option), whichever is the less;
(b) On routes where oxygen is necessary to be carried for 10 % of the passengers for the flight time between 10 000 ft and 13 000 ft, the oxygen should be provided either by:
(1) a plug-in or drop-out oxygen system with sufficient outlets and dispensing units uniformly distributed throughout the cabin so as to provide oxygen to each passenger at his/her own discretion when seated on his/her assigned seat; or
(2) portable bottles, when a cabin crew member is required on board such flight.
Pressurized aeroplanes flying below 25,000 feet without passenger oxygen systems must establish maximum operational altitude using emergency descent profiles. These profiles consider pilot reaction time and maximum operational speed. Oxygen must be available for 10% of passengers on routes between 10,000 and 13,000 feet, using either fixed or portable systems.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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