Altitude-hypoxia, when breathing ambient air, should not usually occur (indifferent phase)
Domanda 303, Human Performance and Limitations - ATPL - Airline Transport Pilot license
| Between 3 000 m and 5 000 m |
| Up to 5 000 m |
| Between 5 000 m and 7 000 m |
| Below 3 000 m |
