If a potential hazard is observed near the aircraft while taxiing, the correct procedure to signal the flight crew involves a combination of visual signals and, if possible, radio communication. The primary visual signal is the emergency stop signal. This is executed by extending both arms above the head and crossing the wands or illuminated batons (if used) to form a distinct "X" shape. This signal immediately conveys to the flight crew that they must stop the aircraft as quickly and safely as possible. The marshaller must maintain this si....
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