Flight safety message

A flight safety message is a category of aeronautical radio message used for matters that directly affect the safe conduct of a flight. It includes air traffic control clearances and instructions, and other operational messages where safety is the main purpose. You will hear or transmit it during normal ATS communication, often with higher priority than routine traffic. As a pilot, you should copy it accurately, read back when required, and act on it exactly as instructed or clarify immediately if unsure.