Which code indicates a radio communications failure in an aeronautical context?

Which code indicates a radio communications failure in an aeronautical context?

• A. 7600
• B. 7500
• C. 7700
• D. 7605

Answer: (A)

When pilots can’t communicate with ATC, they use a specific transponder code to signal the situation. This set of four digits conveys the condition without voice. The code for radio communications failure is 7600, which tells ATC that the aircraft cannot receive or transmit. Because of this, ATC will apply the standard loss-of-communications procedures and guide the flight by other means. The other common codes have different meanings: 7500 indicates a hijacking, and 7700 signals a general emergency. 7605 isn’t a standard international code for a recognized condition.

When pilots can’t communicate with ATC, they use a specific transponder code to signal the situation. This set of four digits conveys the condition without voice. The code for radio communications failure is 7600, which tells ATC that the aircraft cannot receive or transmit. Because of this, ATC will apply the standard loss-of-communications procedures and guide the flight by other means.

The other common codes have different meanings: 7500 indicates a hijacking, and 7700 signals a general emergency. 7605 isn’t a standard international code for a recognized condition.