What phrase should a pilot use in an urgency situation?

In an urgency situation, the appropriate phrase for a pilot to use is "PAN-PAN" repeated three times. This terminology indicates that there is an urgent situation that requires attention but does not pose an immediate threat to life or safety. Using "PAN-PAN" alerts air traffic control and surrounding aircraft to prioritize communication and assistance while providing a clear understanding that the situation is serious but not critical.

The choice "MAY DAY," while a well-known distress call, signifies a life-threatening emergency, which distinguishes it from the urgency indicated by "PAN-PAN." Similarly, "HELP ME" and "URGENT" do not follow standard aviation communication protocols, making them less effective in conveying the required urgency to air traffic control and nearby aircraft. The standardization provided by "PAN-PAN" ensures clarity and proper response in emergency communications.