What must helicopters flying under Special VFR (SVFR) obtain?

Helicopters flying under Special VFR (SVFR) are required to obtain ATC clearance. SVFR allows aircraft to operate in weather conditions that are below the normal VFR minimums, such as when visibility is less than 3 statute miles or when the cloud ceiling is lower than 1,000 feet.

To enter or fly within controlled airspace under SVFR, pilots must communicate with and receive specific clearance from Air Traffic Control (ATC). This clearance ensures that the helicopter can safely navigate through the airspace, considering other traffic and any potential hazards. Additionally, the requirement for ATC clearance promotes safety by allowing for coordination with air traffic services, which is critical when visibility and other weather conditions are compromised.

The other options—permission from local law enforcement, a special license, and approval from the FAA—are not necessary protocols related to SVFR operations, making them less relevant in this context.