Question id 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.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license