PAN-PAN - (pronounced pahn-pahn) used to signal urgent information, like when someone has fallen overboard, or a boat is drifting into shore or a busy shipping channel.
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Announcing the problem - the crew will communicate the problem to ATC. Emergency communication protocols (MAYDAY or PAN PAN) should be used but non-standard phraseology (“We've lost No. 2”, “Engine No. 2 is gone/dead”, “We've got no thrust/power in No.
The term 'Mayday' originates from the French phrase 'm'aider' which means 'help me'. It was first adopted as a distress signal for aviation in the early 1920s. The credit for its implementation goes to Frederick Stanley Mockford, a senior radio officer at London's Croydon Airport.