Certified Transport Registered Nurse Certification Practice Exam

What does the transponder code 7700 indicate?

1. Loss of communication

2. Resistance encountered

3. General emergency

4. Low fuel warning

The correct answer is: Resistance encountered

The transponder code 7700 is universally recognized in aviation as indicating a general emergency. When a pilot sets their transponder to this code, it alerts air traffic control and surrounding aircraft that the situation being faced requires immediate attention and assistance. This code communicates that the aircraft is experiencing an emergency condition, which could encompass a wide range of critical situations such as mechanical failure, medical emergencies on board, or other serious issues requiring immediate intervention. Pilots are trained to use this code in urgent scenarios to ensure that they receive the necessary support as quickly as possible, enhancing safety for the crew and passengers onboard. In contrast, loss of communication would typically be indicated by different transponder codes, while low fuel warnings are addressed through standard procedures rather than specific codes. Similarly, resistance encountered does not correspond to a recognized transponder signal.