Which selectable modes can be found in the ATC radio submenu?

The selectable modes found in the ATC radio submenu include TA/RA, TA ONLY, and TEST.

TA/RA stands for Traffic Advisory/Resolution Advisory, which is used in aircraft systems to alert pilots to potential traffic conflicts and provide resolution advisories to prevent collisions. TA ONLY refers specifically to the traffic advisory mode that provides alerts without giving resolution advice. TEST is a mode used to ensure that the alerting system is functioning correctly, allowing pilots and maintenance personnel to verify that the traffic awareness system is operational.

Understanding these modes is essential for maintaining situational awareness and ensuring safety in air traffic management. The inclusion of both TA/RA and TA ONLY gives pilots the flexibility to choose how they want to receive traffic information based on their operational needs at any given time.