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Possible Answers:
MAYDAY.
Last seen on: The Sun – Two Speed Crossword – Mar 7 2019
Random information on the term “MAYDAY”:
The aircraft emergency frequency (also known as GUARD) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress. The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD) or VHF Guard, and 243.0 MHz for military use, also known as Military Air Distress (MAD) or UHF Guard. Earlier emergency locator transmitters used the guard frequencies to transmit, but an additional frequency of 406 MHz is used by more modern ELTs.
The choice of 121.5 MHz was made by the ICAO in conjunction with ARINC and the ITU.
The main civil voice frequency 121.5 MHz is monitored by most air traffic control towers, FSS services, national air traffic control centers, military air defense and other flight and emergency services, as well as by many commercial aircraft.
In the UK, 121.5 MHz is monitored by the Royal Air Force Distress and Diversion cells (known as “D&D”) at the London Terminal Control Centre and the Shanwick Oceanic Control, from a nationwide network of antennas. Depending on the aircraft’s altitude and location, the personnel in the centres may be able to use triangulation to determine its exact position which can be useful to the pilot if the aircraft is lost or “temporarily unsure of position”.