Which code indicates a radio failure?

Which code indicates a radio failure?

• A. 7700
• B. 7600
• C. 1200
• D. 7500

Answer: (B)

Transponder codes warn ATC about special conditions quickly and clearly. When radio contact is lost, the pilot squawks 7600, signaling a radio failure. ATC then follows the standard lost-communication procedures, continuing the last assigned clearance or route and using the expected further clearance as needed while trying to re-establish contact. The other codes relate to different situations: 7500 is a hijack, 7700 is a general emergency, and 1200 is the VFR code used in uncontrolled airspace. So the code that indicates a radio failure is 7600.

Transponder codes warn ATC about special conditions quickly and clearly. When radio contact is lost, the pilot squawks 7600, signaling a radio failure. ATC then follows the standard lost-communication procedures, continuing the last assigned clearance or route and using the expected further clearance as needed while trying to re-establish contact. The other codes relate to different situations: 7500 is a hijack, 7700 is a general emergency, and 1200 is the VFR code used in uncontrolled airspace. So the code that indicates a radio failure is 7600.