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  2. Airspace class (United States) - Wikipedia

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

    VFR visibility requirements in class G airspace are 1 mile (1.6 km) by day, and 3 miles (5 km) by night, for altitudes below 10,000 feet (3,050 m) MSL but above 1,200 ft AGL. Beginning at 10,000 feet MSL, 5 miles (8 km) of visibility are required, day and night.

  3. Airspace class - Wikipedia

    en.wikipedia.org/wiki/Airspace_class

    Class E airspace exists above Class G surface areas from 14,500 ft (4,400 m) MSL to 18,000 ft (5,500 m) MSL. Federal airways from 1,200 ft (370 m) AGL to 18,000 ft (5,500 m) MSL within 4 miles (6 km) of the centerline of the airway is designated Class E airspace. Airspace at any altitude over FL600 (60,000 ft; 18,300 m) (the ceiling of Class A ...

  4. List of Class C airports in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_Class_C_airports...

    The innermost ring with a radius of 5 nautical miles (9 km) typically extends from the surface area around the airport to 4,000 feet (1,220 m) AGL (above ground level; charted in MSL), and an outer ring, with a radius of 10 nautical miles (19 km) that typically surrounds the inner ring and extends from a floor at 1,200 feet (370 m) AGL, (also ...

  5. National Airspace System - Wikipedia

    en.wikipedia.org/wiki/National_Airspace_System

    Class C is also individually designed for airports but usually covers a surface area of about 5 nautical miles around the airport up to 1,200 ft AGL. At 1,200 ft. the airspace extends to 10 nautical miles in diameter which continues to 4,000 ft. Pilots are required to establish two-way radio communications with the ATC facility providing air ...

  6. Airspace - Wikipedia

    en.wikipedia.org/wiki/Airspace

    Class A airspace is generally the airspace from 18,000 feet (~3.4 miles, 5.5 km) mean sea level (MSL) up to and including flight level (FL) 600 (~11.4 miles, 18.3 km), including the airspace overlying the waters within 12 nautical miles (NM) (~13.8 miles, 22.2 km) of the coast of the 48 contiguous states and Alaska. Unless otherwise authorized ...

  7. Height above ground level - Wikipedia

    en.wikipedia.org/wiki/Height_above_ground_level

    In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL [1] or HAGL) is a height measured with respect to the underlying ground surface.This is as opposed to height above mean sea level (AMSL or HAMSL), height above ellipsoid (HAE, as reported by a GPS receiver), or height above average terrain (AAT or HAAT, in broadcast engineering).

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  9. Visual meteorological conditions - Wikipedia

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

    For instance, in Australia, VMC minima outside controlled airspace are clear of cloud with 5,000 m visibility below 3,000 ft AMSL or 1,000 ft AGL (whichever is higher), and 1,000 ft vertical/1,500 m horizontal separation from cloud above these altitudes or in controlled airspace. Above 10,000 ft, 8,000 m visibility is required to maintain VMC.