O2
My AB book says that we need enough O2 for all occupants from decompression to the time we reach 10000'. Being an A300F, fitted with 4 115 cu/ft bottles, in "normal" mode, 2 pilots plus 7 occupants need 900 psi (average per bottle at 21 deg) to last 120 min. There is no provision for 100% and it would be hypothetic to mention emergency since that with an actual fire on board the AC structural integrity would probably not last more than 20 min...