Using that logic we could never have operated that route, nor could any other similar aircraft,
So you're saying you operated a service in which,in the event of a depressurisation,you could not have descended below FL 140 before the Pax O2 ran out? Under what regulator?
I can assure you this would be illegal under many jurisdictions. We have certified escape routes to allow us to get the Pax down before the O2 runs out on every sector where the terran is high, including the Himalayas.