ATPL: Under which condition should you fly considerably lower (4 000 ft or more) than the optimum altitude ?
Domanda 121, Performance - ATPL - Airline Transport Pilot license
| If the maximum altitude is below the optimum altitude. |
| If at the lower altitude either considerably less headwind or considerably more tailwind can be expected. |
| If at the lower altitude either more headwind or less tailwind can be expected. |
| If the temperature is lower at the low altitude (high altitude inversion). |
