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  2. Visual meteorological conditions - Wikipedia

    en.wikipedia.org/wiki/Visual_meteorological...

    Air traffic control may also issue a "special VFR" clearance to VFR aircraft, to allow departure from a control zone in less than VMC – this reduces the visibility minimum to 1,600 m. Generally, VMC requires greater visibility and cloud clearance in controlled airspace than in uncontrolled airspace.

  3. Visual flight rules - Wikipedia

    en.wikipedia.org/wiki/Visual_flight_rules

    Under visual meteorological conditions, the minimum visual range, distance from clouds, or cloud clearance requirements to be maintained above ground vary by jurisdiction, and may also vary according to the airspace in which the aircraft is operating. [4] In some countries, VFR flight is permitted at night, and is known as night VFR.

  4. VFR-on-top - Wikipedia

    en.wikipedia.org/wiki/VFR-on-Top

    VFR over-the-top is different from VFR-on-top, in that VFR-on-top is an IFR clearance that allows the pilot to fly VFR altitudes, while VFR over-the-top is strictly a VFR operation in which the pilot maintains VFR cloud clearance requirements while operating on top of an undercast layer. [2]

  5. Airspace class (United States) - Wikipedia

    en.wikipedia.org/wiki/Airspace_class_(United_States)

    VFR visibility and cloud clearance requirements are the same as for class C and D airspaces when below 10,000 feet (3,000 m) MSL. Above 10,000 ft MSL, the visibility requirement is extended to 5 miles (8 km) and the cloud clearance requirement is extended to 1,000 feet (300 m) below clouds, 1,000 feet (300 m) above, and 1 mile (1.6 km ...

  6. VFR over-the-top - Wikipedia

    en.wikipedia.org/wiki/VFR_Over-The-Top

    In some countries pilots are required to get an air traffic control (ATC) clearance, or in absence of a controller, advise the nearest flight service station or center. Pilots are required to adhere to VFR minima when climbing and descending over the clouds. Flight in cloud is not permitted. [1]

  7. Instrument flight rules - Wikipedia

    en.wikipedia.org/wiki/Instrument_flight_rules

    In aviation, instrument flight rules (IFR) is one of two sets of regulations governing all aspects of civil aviation aircraft operations; the other is visual flight rules (VFR). The U.S. Federal Aviation Administration 's (FAA) Instrument Flying Handbook defines IFR as: "Rules and regulations established by the FAA to govern flight under ...