When would a pilot use the term "MAYDAY"?

The term "MAYDAY" is an internationally recognized distress signal used in aviation and maritime communication. It specifically indicates that there is an immediate threat to life or the safety of the aircraft and its occupants, and immediate assistance is required. When a pilot issues a "MAYDAY," it conveys the gravity of the situation and alerts air traffic control and other aircraft that urgent help is needed.

Using "MAYDAY" during a routine check-in, in a non-critical situation, or while providing a weather update would be inappropriate and misleading. These contexts do not involve an emergency; therefore, using such a serious term could cause confusion and dilute the urgency of actual distress signals in the future. The clear definition and appropriate use of "MAYDAY" emphasizes its critical importance in aviation safety communication.