What squawk code should be used in an emergency situation?

In an emergency situation, the appropriate squawk code to use is 7700. This code is specifically designated for transponder use during emergencies, indicating to Air Traffic Control (ATC) that the aircraft is experiencing a critical situation that requires immediate attention. When a pilot enters this code into the transponder, it alerts ATC to the urgency of the situation, allowing them to provide assistance and prioritize the aircraft's needs.

In contrast, the other codes serve different purposes: 7500 indicates a hijacking or unlawful interference, and 7600 is used to signify a loss of communication. The code 1200 is reserved for VFR (Visual Flight Rules) flights and does not communicate an emergency situation. Understanding these codes and their meanings is essential for pilots to effectively communicate their status and needs in various scenarios.