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  2. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    VFR standard squawk code when no other code has been assigned. [1] EASA countries: Code that pilot shall set when not receiving air traffic services, unless otherwise prescribed by the competent authority. [12] US: External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are ...

  3. Transponder (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Transponder_(aeronautics)

    A discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar. [6] [7] Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits ...

  4. Aviation transponder interrogation modes - Wikipedia

    en.wikipedia.org/wiki/Aviation_transponder...

    When the transponder receives an interrogation request, it broadcasts the configured transponder code (or "squawk code"). This is referred to as "Mode 3A" or more commonly, Mode A. A separate type of response called "Ident" can be initiated from the airplane by pressing a button on the transponder control panel.

  5. CRAFT (aviation) - Wikipedia

    en.wikipedia.org/wiki/CRAFT_(aviation)

    The initial altitude is sometimes stated on the charts. If not, it will be given by the air traffic controller. The departure frequency is given to the pilot when ATC hands the aircraft over to the next sector. A typical IFR clearance would be: OOABC, cleared to Ostend via the DENUT 7C departure, climb flight level six zero, squawk four six ...

  6. Air traffic control radar beacon system - Wikipedia

    en.wikipedia.org/wiki/Air_traffic_control_radar...

    The transponder has a small required set of controls and is simple to operate. It has a method to enter the four-digit transponder code, also known as a beacon code or squawk code, and a control to transmit an ident, which is done at the controller's request (see SPI pulse below). Transponders typically have 4 operating modes: Off, Standby, On ...

  7. List of aircraft type designators - Wikipedia

    en.wikipedia.org/wiki/List_of_aircraft_type...

    These codes are defined by both the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA). ICAO codes are published in ICAO Document 8643 Aircraft Type Designators [1] and are used by air traffic control and airline operations such as flight planning. While ICAO designators are used to ...

  8. Virtual Air Traffic Simulation Network - Wikipedia

    en.wikipedia.org/wiki/Virtual_Air_Traffic...

    On February 27, 2016, the vERAM ATC client was approved for use on the VATSIM network. [44] Also created by Ross Carlson, the client aims to replicate the real-world ERAM system used in many US ARTCC facilities. On July 18, 2020, the vatSys ATC client was approved for use on the VATSIM network. [45]

  9. Secondary surveillance radar - Wikipedia

    en.wikipedia.org/wiki/Secondary_surveillance_radar

    SSR antenna of Deutsche Flugsicherung at Neubrandenburg, in Mecklenburg/Western Pomerania Transponder in a private aircraft squawking 2000. Secondary surveillance radar (SSR) [1] is a radar system used in air traffic control (ATC), that unlike primary radar systems that measure the bearing and distance of targets using the detected reflections of radio signals, relies on targets equipped with ...