Editing Mayday (section)

==Other urgent calls==

===Pan-pan===
{{main|Pan-pan}}
"[[Pan-pan]]" (from the French: ''{{lang|fr|panne}}'', 'a breakdown') indicates an urgent situation, such as a mechanical failure or a medical problem, of a lower order than a "grave and imminent threat requiring immediate assistance". The suffix "medico" originally was to be added by vessels in British waters to indicate a medical problem ("pan-pan medico", repeated three times), or by aircraft declaring a non-life-threatening medical emergency of a passenger in flight, or those operating as protected medical transport in accordance with the [[Geneva Conventions]].<ref>ICAO Annex 10 V2 Section 5.3</ref> "Pan-pan medico" is no longer in official use.<ref name="Tim Bartlett 2009 53">{{cite book|title=VHF handbook|author=Tim Bartlett|publisher=The Royal Yachting Association|year=2009|page=53|location=Southampton|isbn=978-1-905104-03-1}}</ref>

===Declaring emergency===
Sometimes the phrase "declaring emergency" is used in aviation, as an alternative to calling "mayday".<ref>{{cite web|url=http://www.ntsb.gov/ntsb/GenPDF.asp?id=DCA05MA003&rpt=fa|archive-url=https://web.archive.org/web/20100915034443/http://www.ntsb.gov/ntsb/GenPDF.asp?id=DCA05MA003&rpt=fa|title=National Transportation Safety Board FACTUAL REPORT AVIATION|url-status=dead|archive-date=15 September 2010|date=15 September 2010}}</ref> For example, in 1998 [[Swissair Flight 111]] radioed "Swissair one-eleven [[Heavy (aviation)|heavy]] is declaring emergency" after their situation had worsened, upgrading from the "pan-pan" which was declared earlier.<ref>{{cite web|url=https://aviation-safety.net/investigation/cvr/transcripts/atc_sr111.php|title=Aviation Safety Network > Accident investigation > CVR / FDR > Transcripts > ATC transcript Swissair Flight 111 - 02 SEP 1998|first=Harro|last=Ranter|website=aviation-safety.net|access-date=10 February 2019|archive-date=25 August 2019|archive-url=https://web.archive.org/web/20190825144346/https://aviation-safety.net/investigation/cvr/transcripts/atc_sr111.php|url-status=live}}</ref>

However, the [[International Civil Aviation Organization]] recommends the use of the standard "pan-pan" and "mayday" calls instead of "declaring an emergency".<ref>{{cite web|title=ICAO Standard Phraseology|url=http://www.skybrary.aero/bookshelf/books/115.pdf|work=SKYbrary|access-date=13 June 2013|archive-date=29 December 2018|archive-url=https://web.archive.org/web/20181229072920/https://www.skybrary.aero/bookshelf/books/115.pdf|url-status=live}}</ref> Cases of pilots using phrases other than "pan-pan" and "mayday" have caused confusion and errors in aircraft handling.<ref>{{cite web|title=Aircraft Fuel Status and Communication Procedures|url=http://www.hkatc.gov.hk/HK_AIP/aic/AIC21-12.pdf|publisher=Hong Kong Civil Aviation Department|access-date=13 June 2013|archive-date=8 August 2017|archive-url=https://web.archive.org/web/20170808151554/http://www.hkatc.gov.hk/HK_AIP/aic/AIC21-12.pdf|url-status=dead}}</ref>

===Silencing other communications traffic===
{{See also|Radio silence}}
"Seelonce mayday" (using an approximation of the French pronunciation of ''{{lang|fr|silence}}'') is a demand that the channel only be used by the vessel/s and authorities involved with the distress. The channel may not be used for normal working traffic until "seelonce feenee" is broadcast. "Seelonce mayday" and "seelonce feenee" may only be sent by the controlling station in charge of the distress. The expression "stop transmitting – mayday" is an aeronautical equivalent of "seelonce mayday". "Seelonce distress" and "prudonce" are no longer in use since ITU WRC-07.{{citation needed|date=January 2024}}

The format for a "seelonce mayday" is MAYDAY, All Stations x3 or [Interfering station] x3, this is [controlling station], SEELONCE MAYDAY.<ref name="ITU-RR-2016">{{cite web |title=Radio Regulations, edition of 2016 |url=http://handle.itu.int/11.1004/020.1000/1.43 |website=ITU |publisher=International Telecommunication Union (ITU) |access-date=23 June 2023 |archive-date=25 September 2024 |archive-url=https://web.archive.org/web/20240925015120/https://www.itu.int/en/history/Pages/RadioRegulationsA.aspx?reg=1.43 |url-status=live }}</ref>

"Seelonce feenee" (from French ''{{lang|fr|silence fini}}'', 'silence finished') means that the emergency situation has been concluded and the channel may now be used normally. "Distress traffic ended" is the aeronautical equivalent of "seelonce feenee".<ref>{{cite web|url=https://www.egmdss.com/gmdss-courses/mod/resource/view.php?id=67|title=DISTRESS alert (GMDSS)|first=Spinaker|last=d.o.o|website=egmdss.com|access-date=20 July 2018|archive-date=16 April 2017|archive-url=https://web.archive.org/web/20170416094125/http://www.egmdss.com/gmdss-courses/mod/resource/view.php?id=67|url-status=live}}</ref>

The format for the "seelonce feenee" is MAYDAY, All stations x3, this is [controlling station] x3, date and time in UTC, distressed vessels MMSI number, distressed vessels name, distressed vessels call sign, SEELONCE FEENEE.<ref name="ITU-RR-2016" />