When the aircraft is no longer in distress, the flight crew shall inform the relevant ATC unit about that. This is called cancelling the distress condition. The flight crew shall transmit a message cancelling the distress condition including the words "CANCEL DISTRESS".
ICAO Annex 10, Volume II
5.3.2 Radiotelephony distress communications
5.3.2.5 Termination of distress communications and of silence
5.3.2.5.1 When an aircraft is no longer in distress, it shall transmit a message cancelling the distress condition.
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