Code 7700 when the pilot declares an emergency and the aircraft is not radar identified.
SQUAWK MAYDAY ON 7700.
NOTE: Instead of displaying “7700” in the data block, ERAM will display “EMRG,” and STARS/MEARTS will display
After radio and radar contact have been established, you may request other than single-piloted helicopters and
single-piloted turbojet aircraft to change from Code 7700 Code 7700 to a computer-assigned
1. The code change, based on pilot concurrence, the nature of the emergency, and current flight conditions
will signify to other ATC facilities that the aircraft in distress is identified and under ATC control.
2. Pilots of single-piloted helicopters and single-piloted turbojet aircraft may be unable to change
transponder settings during an emergency.
RADAR CONTACT (position). IF FEASIBLE, SQUAWK (code).