What must be added to the aircraft conflict/Mode C alert for heavy aircraft?

The addition of "Heavy" after the callsign and "Caution Wake Turbulence" after the alert for heavy aircraft is necessary to enhance safety procedures in air traffic management. When an aircraft is classified as a heavy, this designation is crucial for both pilots and air traffic controllers as it indicates the aircraft's size and wake turbulence potential.

The term "Heavy" refers to aircraft that have a maximum takeoff weight of 255,000 pounds or more. It is important for other aircraft in the vicinity to be aware of this classification because heavy aircraft generate stronger wake turbulence, which can pose a significant risk to smaller aircraft following closely behind. By adding "Caution Wake Turbulence," air traffic controllers alert pilots to the need for additional caution when flying in the vicinity of heavy aircraft.

This additional information helps maintain separation and enhances situational awareness, contributing to overall safety in the airspace. Thus, the requirement to use both the "Heavy" designation and the cautionary statement acknowledges the potential hazards that heavy aircraft can pose due to their wake turbulence, ensuring that all relevant parties are informed and can take appropriate precautions.