Refer to figure.
What does a yellow diagonal on a red square in the signal area of an aerodrome indicate?
Refer to figure.
ICAO Annex 2
4.2 Visual ground signals
4.2.2 Need for special precautions while approaching or landing
A horizontal red square panel with one yellow diagonal when displayed in a signal area indicates that owing to the bad state of the manoeuvring area, or for any other reason, special precautions must be observed in approaching to land or in landing.
The signal area at an aerodrome refers to a designated area on the aerodrome where visual ground signals are displayed to provide information to pilots flying, especially when radio communication is unavailable or limited.
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