Squawk Code
Definition
A four-digit code assigned by ATC and entered into an aircraft's transponder for identification on radar. Special codes include 7500 (hijack), 7600 (radio failure), and 7700 (emergency).
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Transponder
An electronic device on an aircraft that receives radar signals and automatically transmits a response with identification and altitude information back to air traffic control.
ATC Clearance
Authorization from air traffic control for an aircraft to proceed under specified conditions, including route, altitude, and speed. Pilots must receive clearance before taxiing, taking off, or landing.
Radar Vectoring
The process of providing navigational guidance to aircraft by ATC through specific headings (vectors) based on radar observation. Used to sequence arriving aircraft and maintain separation.
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