Flight Crew Portable Oxygen
We have 311 litres portable O2 bottle on 737 with demand regulator for constant 3 litres flow or On-demand 100% O2 but I can not find guidance on which one to chose in different non-normal situations (checked FCOM and SOP).
I guess on-demand at higher altitudes but i would like to hear some "official info" if somebody care to share.
Thanks