ATPL: A pneumatic de-icing system should be operated:
Domanda 289, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
| When Entering Areas With Icing Conditions. |
| When there are approximately 5 cm of ice on the leading edges. |
| When there is approximately 1,5 cm of ice on the leading edges. |
| Only At Take-off And During Approach. |
