Question

Minimum oxygen requirements for pressurized aircraft following emergency descent:

Entire period of flight exceeding 30 min at the cabin-pressure-altitudes above 10000 feet ASL but not exceeding 13000 feet ASL and Entire period of flight at cabin-pressure-altitudes above 13000 feet ASL, and a period of flight of not less than 30 min and for flight crew members, two hrs for aircraft the type of cerficate of which authorizes flight at altitudes exceeding FL 250
a) Oxygen supply must be available for all passenger
b) All crew members and 10 percent of passengers and, in any case no less than one passenger

Answer 1

For flights above certain altitudes, airlines must provide sufficient oxygen to passengers and crew to mitigate the risks of hypoxia. The requirements are stricter for flight crew and for flights at extremely high altitudes. Mountain climbers also carry bottled oxygen at high altitudes to prevent hypoxia.

Step-by-step explanation:

When flying at high altitudes, oxygen levels in the cabin can become insufficient, thus pressurized aircraft have oxygen supply requirements to ensure passenger safety. These requirements vary depending on the flight conditions and altitude.

For flights operating at cabin-pressure-altitudes above 10,000 feet ASL but not exceeding 13,000 feet ASL for more than 30 minutes, there must be an available oxygen supply for passengers. Additionally, the entirety of the flight above 13,000 feet ASL requires oxygen availability. Specifically for flight crew members, an oxygen supply must be available for the whole duration of the flight above these altitudes, with a minimum of two hours' supply for flights with a certificate authorizing travel at altitudes exceeding Flight Level 250 (approximately 25,000 feet ASL).

For mountain climbers at high altitudes, the decreased oxygen concentration in the air leads to a condition called hypoxia. Climbers carry bottled oxygen to mitigate this risk, but calculating the precise amount of oxygen needed involves understanding the body's physiology, the ambient conditions, and the physical exertion expected during the climb.