In ACT mode with ALT on, transmits which data?

• A. The code and altitude information
• B. The code only
• C. Altitude only
• D. None

Answer: (A)

In this setup, ACT mode makes the transponder actively broadcast your identity as a code, and turning ALT on adds altitude data to those transmissions. So the system sends both the code (the aircraft’s squawk) and the altitude, not just one or the other. If ALT were off, you’d see the code alone; with ACT but ALT off, you’d still have the single data element. But with ACT and ALT on, both pieces of information—the code and the altitude—are transmitted.