Which of the following is NOT an emergency transponder code?

The code 8000 is indeed not designated as an emergency transponder code. In the context of aviation, transponder codes are used to communicate specific situations to air traffic control.

The code 7500 is used to indicate a hijacking situation, alerting air traffic controllers that the aircraft's crew is under threat. The code 7600 signifies a loss of communication, informing controllers that the pilot is unable to communicate with them via radio. The code 7700 is an emergency code for various distress situations that might include medical emergencies or critical failures.

In contrast, the code 8000 does not have a specific emergency situation associated with it and is reserved for other uses that do not involve emergencies. Understanding the purpose of these emergency codes is essential for ensuring safety and effective communication in aviation operations.