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A series of red flashes from aerodrome control directed towards an aircraft in flight means...
  • A
    continue circling and wait for further instruction.
  • B
    aerodrome temporarily closed, continue circling.
  • C
    aerodrome unsafe, do not land.
  • D
    give way to an aircraft in an emergency situation.

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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