Aeronautical Information Manual
AIM 6-4-2
Transponder Operation During Two‐way Communications Failure
This reproduces published FAA reference text for study. It does not replace the current official FAA publication or regulation.
If an aircraft with a coded radar beacon transponder experiences a loss of two‐way radio capability, the pilot should adjust the transponder to reply on Mode A/3, Code 7600.
The pilot should understand that the aircraft may not be in an area of radar coverage.
Retrieved from ecfr.gov on July 20, 2026.