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Possible Answers:
MAYDAY.
Last seen on: –Eugene Sheffer – King Feature Syndicate Crossword – Apr 8 2024
–Thomas Joseph – King Feature Syndicate Crossword – Mar 15 2024
Eugene Sheffer – King Feature Syndicate Crossword – Sep 5 2020
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.
In the United States, the emergency frequency 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. The notice to airmen FDC 4/4386 requires “…all aircraft operating in United States National Airspace, if capable, shall maintain a listening watch on VHF GUARD 121.5 or UHF 243.0.”