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383
URGENCYSIGNALS
• The following signals, used either together or separately, shall beused by
an aircraft for the purposeof giving notice of difficultieswhich compel it to
landwithout requiring immediate assistance:
– the repeated switching on and off of the landing lights;
– the repeated switching on and off of thenavigation lights, in such a
manner as tobe distinctive from the flashing lights describedbelow;
– a succession ofwhitepyrotechnical lights.
• The following signals, used either together or separately, shall beused
by an aircraft for thepurpose of giving notice that the aircraft has a very
urgentmessage to transmit concerning the safety of a ship, aircraft or
vehicle, or of some person onboard orwithin sight:
– in radiotelegraphy, 3 repetitionsof thegroupXXX (– .. –– .. –– .. –), sent
with the lettersofeachgroup, and thesuccessivegroupsclearlyseparated
fromeachother, andsentbefore the transmissionof themessage;
– in radiotelephony, 3 repetitions of thewords PANPAN, sent before the
transmission of themessage;
– a succession of greenpyrotechnical lights;
– a succession of greenflasheswith signal apparatus.
SAFETYSIGNALS
• The safety signal shall be transmittedwhen an aircraftwishes to transmit
amessage concerning the safety of navigationor to give important
meteorological warnings.
• The safety signal shall be sent before the call and:
– in the caseof radiotelegraphy shall consist of 3 repetitions of thegroup
TTT (– – –), sentwith the letters of eachgroup and the successive
groups clearly separated from each other; and
– in the caseof radiotelephony shall consist of theword ‘SECURITY’,
repeated 3 times.
signals
5 –d i s tress S I GNAL S