What are the cloud clearance and visibility minimums for operating a helicopter under special VFR?

Operating a helicopter under special VFR (Visual Flight Rules) allows pilots to fly in weather conditions that are below the standard VFR minimums, but still require certain limitations to ensure safety. The correct answer specifies that a pilot must be clear of clouds and maintain a visibility of at least 1 mile when operating under special VFR in controlled airspace. This requirement ensures that, while visibility may be reduced, the pilot retains the ability to see and avoid obstacles, other aircraft, and ensure safe navigation.

Maintaining a visibility of 1 mile allows pilots to conduct safe operations while still providing some flexibility in conditions that might not meet normal VFR standards. Additionally, being clear of clouds ensures that the pilot is able to maintain visual reference to the ground or surrounding features, crucial in navigating and avoiding hazards.

In contrast, requiring additional visibility or cloud cover (as indicated in the other choices) would impose stricter limitations, making it less feasible for operations in many less-than-ideal weather conditions, especially in close proximity to airports or urban areas. The standard for special VFR is specifically designed to accommodate lower visibility situations while still prioritizing safety and situational awareness.