DISTRESS AND URGENCY RADIOTELEPHONY COMMUNICATION PROCEDURES
The distress and urgency procedures contained in relate to the use of radiotelephony. The provisions of
Article S30 and Appendix S13 of the ITU Radio Regulations are generally applicable, except that S30.9 permits other
procedures to be employed where special arrangements between governments exist, and are also applicable to
radiotelephony communications between aircraft stations and stations in the maritime mobile service. Distress and urgency traffic shall comprise all radiotelephony messages relative to the distress and urgency
conditions respectively. Distress and urgency conditions are defined as:
a) Distress: a condition of being threatened by serious and/or imminent danger and of requiring immediate assistance.
b) Urgency: a condition concerning the safety of an aircraft or other vehicle, or of some person on board or within
sight, but which does not require immediate assistance.
The radiotelephony distress signal MAYDAY and the radiotelephony urgency signal PAN PAN shall be used
at the commencement of the first distress and urgency communication respectively. At the commencement of any subsequent communication in distress and urgency traffic, it shall be
permissible to use the radiotelephony distress and urgency signals. The originator of messages addressed to an aircraft in distress or urgency condition shall restrict to the
minimum the number and volume and content of such messages as required by the condition.
If no acknowledgement of the distress or urgency message is made by the station addressed by the aircraft,
other stations shall render assistance, as prescribed in respectively.
Note.— “Other stations” is intended to refer to any other station which has received the distress or urgency message
and has become aware that it has not been acknowledged by the station addressed.
Source by ICAO ANNEX 10
Source by ICAO ANNEX 10
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