Who should be assigned beacon codes?

Beacon codes, also known as transponder codes, are specific numerical sequences assigned by air traffic control (ATC) for identification purposes. The choice indicating that only Mode 3/A equipped aircraft should be assigned these codes is correct.

Mode 3/A refers specifically to the older transponder mode that provides basic identification to ATC. This mode is crucial for situational awareness and traffic management. It allows ATC to distinguish between various aircraft in their airspace, providing a fundamental layer of safety.

While there are other types of transponders, such as Mode C, which includes altitude reporting, and Mode S, which provides more advanced capabilities, the essential function of the basic beacon code assignment fundamentally aligns with Mode 3/A. Therefore, focusing on the requirement that Mode 3/A equipped aircraft are the primary recipients of beacon codes clarifies the intention of the regulations around transponder use.

Assigning beacon codes to all aircraft, regardless of equipment, would not be practical or efficient, as not all aircraft are equipped to respond to or utilize a transponder code effectively. Similarly, while Mode C equipped aircraft do require codes for altitude reporting, the context of the question points to the primary and foundational systems, which is why Mode 3/A is