ATPL: Modern pressurized transport airplanes are equipped with:
Domanda 444, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
| Only Portable Oxygen Bottles. |
| Two independent oxygen systems, one supplying the cockpit, the other the cabin. |
| Two oxygen systems both supplying the cockpit and the cabin. |
| Only One Oxygen System Supplying The Whole Aircraft. |
