Originally Posted by
rudestuff
I always undetstood that flight crew had to have oxygen for the entire flight time above 10 000
Which is correct if you're in an unpressurised aircraft!
If you're just starting to learn the ruthless oxy regs (for the 070 exam), I'd start by making a bold distinction between
pressurised and
unpressurised aircraft and the respective supply requirements for
flight crew,
cabin crew, and
passengers (with their percentiles). Any 070 book will have summary tables.