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  2. Airspace class (United States) - Wikipedia

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

    Airspace within the given radius, but in surrounding class C or class B airspace, is excluded. Class D airspace reverts to class E or G during hours when the tower is closed, or under other special conditions. [9] Two-way communication with ATC must be established before entering class D airspace, but no transponder is required.

  3. Instrument flight rules - Wikipedia

    en.wikipedia.org/wiki/Instrument_flight_rules

    Use of instrument flight rules is also required when flying in "Class A" airspace regardless of weather conditions. Class A airspace extends from 18,000 feet above mean sea level to flight level 600 (60,000 feet pressure altitude) above the contiguous 48 United States and overlying the waters within 12 miles thereof. [8]

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

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

    Class C airspace areas are designed to improve aviation safety by reducing the risk of mid-air collisions in the terminal area and enhance the management of air traffic operations therein. [1] Aircraft operating in these airspace areas are subject to certain operating rules and equipment requirements. [1]

  5. List of Class B airports in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_Class_B_airports...

    Aircraft operating in these airspace areas are subject to certain operating rules and equipment requirements. [1] Class B airspace protects the approach and departure paths from aircraft not under air traffic control. All aircraft inside Class B airspace are subject to air traffic control. Traffic operating under VFR must be identified on radar ...

  6. National Airspace System - Wikipedia

    en.wikipedia.org/wiki/National_Airspace_System

    Pilots are also required to change their altimeter settings to 29.92 inHg to ensure all pilots within the airspace have the same readings in order to ensure proper altitude separation. [ 6 ] Class B airspace extends from the surface up to 10,000 ft. AGL and is the area above and around the busiest airports (e.g., LAX , MIA , CVG ) and is also ...

  7. Required navigation performance - Wikipedia

    en.wikipedia.org/wiki/Required_navigation...

    Required Navigation Performance provides a specified level of navigational accuracy for the airspace or stage of flight an aircraft is operating in. Required navigation performance (RNP) is a type of performance-based navigation (PBN) that allows an aircraft to fly a specific path between two 3D-defined points in space.

  8. List of Class D airports in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_Class_D_airports...

    Class D airspace areas are designed to improve aviation safety by reducing the risk of mid-air collisions with a control tower. [1] Aircraft operating in these airspace areas are subject to certain operating rules and equipment requirements. [1]

  9. Airspace class - Wikipedia

    en.wikipedia.org/wiki/Airspace_class

    Permanent two-way radio contact with ATC is required. Permission for using airspace is required except for the special cases listed in clause 114 of the Federal rules for using Russian air space. [11] Class B is not used. Class C airspace is defined below 8,100 metres (26,600 ft) and allows IFR and VFR operations. Both IFR and VFR operations ...