The Civil Aviation (Rules of the Air) Regulations, 2018

42. Distress signals

Edition: 2022-12-31 · In force

The following signals, used either together or separately,mean that grave and imminent danger threatens, and immediate assistance is requested—

(a)a signal made by radiotelegraphy or by any other signalling method consisting of the group SOS in the Morse Code;

(b)a radiotelephony distress signal consisting of the spoken word MAYDAY;

(c)a distress message sent via data link which transmits the intent of the word MAYDAY;

(d)rockets or shells showing red lights, fired one at a time at short intervals;

(e)a parachute flare showing a red light.