Call Sign Mis-Match (CSMM). A CSMM alert will occur when the transmitted ADS-B Flight Identification (FLT ID) does
not match the flight plan aircraft identification. Inform the aircraft of the CSMM.
YOUR ADS-B FLIGHT ID DOES NOT MATCH YOUR FLIGHT PLAN AIRCRAFT IDENTIFICATION.
Duplicate ICAO Address. If the broadcast ICAO address is shared with one or more flights in the same ADS-B Service
Area (regardless of altitude), and radar reinforcement is not available, target resolution may be lost on one or
NOTE: Duplicate ICAO Address Alerts appear as “DA” and are associated with the Data Block (DB) on STARS systems.
Duplicate ICAO Address Alerts appear as “DUP” and are associated with the DB on MEARTS systems. Duplicate ICAO
Address Alerts appear as “Duplicate 24-bit Address” at the AT Specialist Workstation on ERAM systems.
If a CSMM or Duplicate ICAO address is jeopardizing the safe execution of air traffic control functions, instruct
the aircraft to stop ADS-B transmissions, and notify the OS/CIC.
STOP ADS-B TRANSMISSIONS, AND IF ABLE, SQUAWK THREE/ALFA (code).
Not all aircraft are capable of disengaging the ADS-B transmitter independently from the transponder.