In which condition is continued operation prohibited for the aircraft?

Continued operation in areas with Supercooled Large Droplets (SLD) icing is prohibited due to the significant risks associated with this type of icing. SLD icing can lead to rapid accumulation of ice on the aircraft, severely affecting performance, control, and safety. Unlike standard icing conditions, SLD presence often results in larger droplets that can impact the wings and critical control surfaces more aggressively, making it difficult for de-icing systems to manage, and potentially leading to an aerodynamic stall. Therefore, flying in these conditions poses a considerable hazard, necessitating a prohibition on continued operation to ensure the safety of the flight.

In contrast, while turboprop mode and severe turbulence present challenges, there are guidelines and operational procedures in place for managing those situations. Similarly, though taxiing with ice on the wings is hazardous, there are protocols for dealing with ice before departure to ensure safety during the taxi phase.