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In flight the pilot of an aircraft observes a series of projectiles discharged from the ground at intervals of 10 seconds, each showing, on bursting, red and green lights or stars. – The meaning of this signal is the...
  • A
    aircraft is flying in or about to enter a restricted, prohibited or danger area. The aircraft shall take such remedial action as may be necessary.
  • B
    aircraft is crossing an ATZ without authorisation and must give way to traffic in the circuit.
  • C
    aircraft shall establish radio contact on 121.5 MHz with the station on the ground discharging the projectiles.
  • D
    aerodrome nearby you have chosen for landing is unsafe, do not attempt to land. Proceed to your alternate.

ICAO Annex 2
Appendix 1

3. VISUAL SIGNALS USED TO WARN AN UNAUTHORIZED AIRCRAFT FLYING IN, OR ABOUT TO ENTER A RESTRICTED, PROHIBITED OR DANGER AREA

By day and by night, a series of projectiles discharged from the ground at intervals of 10 seconds, each showing, on bursting, red and green lights or stars will indicate to an unauthorized aircraft that it is flying in or about to enter a restricted, prohibited or danger area, and that the aircraft is to take such remedial action as may be necessary.

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