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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Human Performance and Limitations > Following a rapid decompression to 35000 ft, how should the normal-ascent time-of-useful-consciousness estimate of 30–60 seconds be interpreted?

57 - ATPL Question Bank in English - Following a rapid decompression to 35000 ft, how should the normal-ascent time-of-useful-consciousness estimate of 30–60 seconds be interpreted?

Question 57 - Human Performance and Limitations - ATPL - Airline Transport Pilot Licence

It applies unchanged because the rate of pressure loss does not affect oxygen availability.

Useful performance time can be substantially shorter, so oxygen must be used immediately rather than relying on the table as a countdown.

It normally increases because the expanding air provides additional oxygen to the lungs.

It depends only on the aircraft altitude before the decompression, regardless of the new cabin pressure.

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