When a controller requests to "SQUAWK ident," how long does the transponder send the identification signal?

When a controller requests a pilot to "SQUAWK ident," the transponder responds by sending an identification signal that lasts for a designated amount of time. The correct duration for which this identification signal is transmitted is 20 seconds. This identification pulse helps air traffic control (ATC) quickly identify a specific aircraft among many on their radar displays.

Understanding the functions of the transponder, particularly the "SQUAWK ident" feature, is crucial for improving situational awareness and ensuring safety in controlled airspace. The system is designed to allow ATC to efficiently manage numerous flights, with the brief identification signal providing a clear indication of which aircraft needs to be highlighted on their radar.