When radio communication between an aircraft and the control tower fails, air traffic controllers rely on a simple but highly reliable backup method known as gun light signals. From the control tower, the controller uses a powerful handheld signal lamp that projects a narrow beam of colored light toward the aircraft. Each color and flashing pattern has a specific meaning that pilots are trained to recognize. For example, a steady green light tells a pilot it is safe to land or take off, while a
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When radio communication between an aircraft and the control tower fails, air traffic controllers rely on a simple but highly reliable backup method known as gun light signals. From the control tower, the controller uses a powerful handheld signal lamp that projects a narrow beam of colored light toward the aircraft. Each color and flashing pattern has a specific meaning that pilots are trained to recognize. For example, a steady green light tells a pilot it is safe to land or take off, while a
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