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256 - ATPL - For a pressurised aircraft, the supplemental oxygen is:

Question 256 - Operational Procedures - ATPL - Airline Transport Pilot license

The oxygen supplied to a passenger who needs oxygen for physiological reasons.
The oxygen used for protection against smoke and carbon dioxide.
The oxygen supplied to the aeroplane occupants in case of cabin pressurisation failure.
A therapeutic oxygen specifically carried for certain passengers.

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