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646 - ATPL - Under EASA Air OPS Part-CAT (CAT.IDE.A.240), in a non-pressurised aeroplane, supplemental oxygen for 100% of the passengers must be available for the entire flying time when the pressure altitude is above:

Question 646 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

10.000 ft.
12.000 ft.
13.000 ft.
15.000 ft.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license