Private Pilot Private Exam

Which transponder codes should pilots avoid inadvertently selecting during routine changes?

1. 0000, 1202, 2400

2. 4500, 6600, 9900

3. 7500, 7600, 7700

4. 1000, 1200, 1500

The correct answer is: 7500, 7600, 7700

Pilots should avoid inadvertently selecting transponder codes that are reserved for specific situations, which is precisely why the choice of 7500, 7600, and 7700 is correct. The code 7500 is used to indicate that an aircraft is being hijacked. Selecting this code can lead air traffic control and others to take immediate and potentially serious action, believing there is a threat to safety. The code 7600 signifies a loss of communication, alerting ATC that the pilot is unable to communicate with air traffic services, which can lead to confusion and difficulties in managing air traffic. Lastly, 7700 indicates an emergency situation that requires immediate attention from air traffic control. Using any of these codes without a valid reason can create significant operational disruptions and miscommunications, which can jeopardize safety in the airspace. Therefore, it is critical that pilots remain aware of these codes and avoid selecting them unless absolutely necessary. Other codes in the other choices do not carry such implications or are not reserved for emergencies, making them less critical to avoid during routine operations.