Under what condition can an aeroplane equipped with a functioning two-way radio transit a Control Zone during day Special VFR?

An aeroplane equipped with a functioning two-way radio can transit a Control Zone during day Special VFR when flight visibility is at least 1 mile. This regulation is in place to ensure that pilots have sufficient visual reference while navigating through controlled airspace, which enhances safety and situational awareness.

In the context of Special VFR, the visibility criteria serve to allow pilots to operate under visual flight rules, even in conditions that might typically necessitate instrument flight rules (IFR). The requirement for 1 mile of visibility is essential because it helps ensure that pilots can maintain visual connection with the terrain and other aircraft during their maneuvering in the Control Zone.

While other options discuss different visibility requirements or ground visibility, the specific criterion for flight visibility under Special VFR allows for the transition through controlled airspace while prioritizing safety. It’s important for pilots to be familiar with these regulations to ensure they are compliant and safe during their operations.