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31 - ATPL - You are crossing the Alps in a non-pressurised aircraft at an altitude of 15.000 feet. You do not use the oxygen mask because you feel fine. This is unsafe, because:

Question 31 - Human Performance and Limitations - ATPL - Airline Transport Pilot license

Your judgement could be impaired
You will get the bends
The blood-pressure can get too low
The blood-pressure can get too high

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