A red pyrotechnic discharged from aerodrome control to an aircraft in flight means…
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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