Under the Clean Aircraft Concept, what must be completed before takeoff in ground icing conditions?

The correct response is grounded in the requirements established by the Clean Aircraft Concept, which aims to ensure that aircraft are free of contamination before takeoff in icing conditions. A pre-takeoff tactile and visual check is necessary because it helps confirm that surfaces such as wings, control surfaces, and other critical areas are devoid of ice or snow.

The tactile portion of the check allows crew members to physically feel the surfaces to detect any hidden contamination that may not be visually apparent. This thorough approach helps protect the aircraft's performance and safety, as ice or snow can severely impact lift and control during flight.

In this context, while other options mention visual checks or inspections, they do not encompass the comprehensive nature of combining both tactile and visual assessments, which is crucial in ground icing conditions. This multifaceted check ensures that all potential ice and contamination are properly identified and addressed prior to takeoff.