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1988 NO. 158 CIVIL AVIATION REGULATIONS - REG 194
Safety signal
194. (1) The safety signal shall be transmitted when an aircraft wishes to
transmit a message concerning the safety of navigation or to give important
meteorological warnings.
(2) The safety signal shall be sent before the call and:
(a) in the case of radiotelegraphy shall consist of 3 repetitions of the
group TTT (- - -), sent with the letters of each group and the
successive groups clearly separated from each other; and
(b) in the case of radiotelephony shall consist of the word "SECURITY",
repeated 3 times.
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