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To an aircraft in the air at an aerodrome, a series of white flashes means…

  • A

    Land at this aerodrome and proceed to the apron.

  • B

    Give way to other aircraft and continue circling.

  • C

    Aerodrome unsafe, do not land.

  • D

    Return for landing, followed by steady green at the appropriate time.

Refer to figure.
ICAO Annex 2
Appendix 1 - 4. SIGNALS FOR AERODROME TRAFFIC

4.1 Light and pyrotechnic signals

From Aerodrome Control to Aircraft in-flight

  • Steady green - Cleared to land
  • Steady red - Give way to other aircraft and continue circling 
  • Series of green flashes - Return for landing* 
  • Series of red flashes - Aerodrome unsafe, do not land 
  • Series of white flashes - Land at this aerodrome and proceed to apron* 
  • Red pyrotechnic - Notwithstanding any previous instructions, do not land for the time being

    * Clearances to land and to taxi will be given in due course.

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