What is the transponder code indicating a radio failure?

The transponder code indicating a radio failure is 7600. This code is specifically designated for situations where an aircraft experiences a loss of communication capability. When a pilot sets their transponder to 7600, it alerts air traffic control and other pilots that the aircraft is unable to communicate via radio. This allows air traffic controllers to take necessary actions to ensure the safety of the aircraft and to assist it in navigating to a safe landing, often using visual signals or other means of communication.

In contrast, other transponder codes serve different purposes; for instance, 7700 indicates an emergency situation beyond just radio failure, such as a general emergency that may require immediate assistance. Code 1200 is typically used for VFR (Visual Flight Rules) flights and does not denote any specific issue, while 7500 denotes a hijacking situation. Each of these codes serves a unique function in the context of aviation communication and safety protocols. Understanding these designations is crucial for maintaining effective communication and ensuring the safety of airborne operations.