Final answer:
Pilots can request a Special VFR clearance from air traffic control to operate under SVFR in controlled airspace with restricted visibility, but must meet specific regulatory requirements and conditions outlined by the FAA's FARs.
Step-by-step explanation:
Whether you are allowed to fly Special Visual Flight Rules (SVFR) depends on a number of conditions. In general, pilots can request a Special VFR clearance from air traffic control when they need to operate in controlled airspace where the visibilities are below the minimum required for Visual Flight Rules (VFR), but above the minimum required for Special VFR.
To fly under SVFR, you must obtain a clearance from the Air Traffic Control (ATC) responsible for the airspace. Certain conditions must be met, such as the aircraft must be equipped for SVFR, the pilot must have the proper ratings, and the flight cannot impede other IFR traffic. Additionally, SVFR flights are not permitted in certain airspaces from sunset to sunrise unless the pilot is instrument-rated and the aircraft is equipped for instrument flight. It's important to understand the regulations detailed in the FAA's Federal Aviation Regulations (FARs), specifically FAR 91.157, as they explain the exact requirements and limitations for SVFR flight.